Clayshooter08
Site Supporter
Looking to see if it's been done and how??? What tank and where did you tap into fuel system???
ST 1300 External Fuel Tank for IBA/IBR???
- Thread starter Clayshooter08
- Start date
Yes it has been done, many are custom made and/or home made. I did a quick search (blue band atop this page) for auxiliary fuel tank and a few threads popped up. Here are two.
www.st-owners.com
www.st-owners.com
Removing the Ron Majors Aux Fuel Tank | ST1100 Related
So, a couple of years ago we jumped at an opportunity to get my wife back on two wheels by picking up an ST100 from @Jevers . Great guy and he was selling a well setup bike for the right price. All it took for her was a ride on our daughter's ST1100 for her see how comfortable they are. Here...
Auxiliary Fuel tanks (Fuel Cells) | ST1100 Related
I was reading the fuel pump replacement article and came across these two posts : First, someone farkled two vent hoses into the tank. Larry, has anyone suggested those extra hoses may have been connection point for an auxiliary fuel tank? Just a thought. The idea of having auxiliary...
I would also do a google search.
Boyd's Welding in Ocala, Fl. will make one to your size.
fueltankparts.com
Boyd's Welding in Ocala, Fl. will make one to your size.
#1 Source for Custom Aluminum Tanks and Accessories
High quality custom aluminum tanks, tank parts and accessories for any tank application.
fueltankparts.com
Last edited:
Andrew Shadow
Site Supporter
Ask @drbuzzard about it- He has one for his ST1300.
See the below photos.
www.st-owners.com
See the below photos.
this is Sunday's E.M.R. | Ride Reports
i was going to post this yesterday but by the time i got home i was to tired. i hit the road about 05:45 this morning, i really wanted to go for a ride cause i hadn't been feeling well since Wed. and still have more vertigo than i thought. i headed north on Shafer on this dark, mostly cloudy 48f...
But they will not guarantee the volume. The 11.5 gallon Stock plus Aux is a hard and fast rule. There are horror stories about being over capacity. Certification rides you can use whatever wild ass set up you want.I would also do a google search.
Boyd's Welding in Ocala, Fl. will make one to your size.
#1 Source for Custom Aluminum Tanks and Accessories
High quality custom aluminum tanks, tank parts and accessories for any tank application.
I have run an aux fuel tank on my 1300s for years. Currently running two, each hold 3.95 gallons and have a shutoff valve between each of them and the pump. The 5/16 line (throughout) runs to the inspection bolt on the lower tank. You must wait until the bike fuel gauge is down to three bars before pumping or it will overfill the bike and you'll be parked for a little while. I will have to remove one of my tanks when I run rallies that enforce the fuel rule. The tanks are made from 1/8 aluminum and must contain internal baffles. They are approx 4"x12"x20" but that's not exact. You need to calculate the internal capacity of the box AND the filler neck up to the overflow tube MINUS the volume of the baffles. Non-vented screw on caps, overflow tube must run behind the rear tire and away from exhaust.
Here are the rules that were in place in 2021:
Appendix A: Fuel system capacity and auxiliary tanks
I. Fuel System Capacity
Fuel system capacity for motorcycles using liquid fuel will be determined by the method specified below. For motorcycles that do not use liquid fuel, the capacity shall be
determined on a case-by-case basis to ensure that the “gasoline-equivalent” fuel capacity of the motorcycle does not exceed 11.5 gallons (on an energy basis).
1. Original Equipment Tanks
For original equipment (OE) tanks, the manufacturer's specified capacity shall be used unless the IBR has published alternative specifications 90 days in advance of the
event. In the case of conflicting manufacturer's specifications, and in the absence of an alternative specification published by the IBR, the highest capacity published by the
manufacturer shall be used. For example, in the case of the BMW R1100RT, the highest capacity specified by the manufacturer is 7.26 U.S. gallons, which our measurements
confirm is the correct capacity.
2. Modified Tanks, After-Market Tanks, and Auxiliary Fuel Systems
The capacity of all non-OE elements of a fuelsystem shall be determined by the amount of water or fuel required to fill and empty system (including lines, pumps, filters,
etc.). Water may be used to measure individual tanks or whole systems. However, we will usually use premium grade gasoline unless the motorcycle is designed to run on an
alternative fuel (e.g., Diesel fuel). For systems equipped with a fill pipe that extends into a vapor space, the capacity will be determined by filling the system to the bottom of the
fill pipe, unless the system has been modified in some manner to permit a fill rate in excess of 1.0 gallons per minute above the bottom of the fill pipe.
The volume of liquid required to fill the system will be calculated based on the weight of the liquid required to fill the tank and the density of that liquid. For example,
using gasoline with a density of 6.180 pounds per gallon, if the weight of gasoline required to fill the system is 30.90 pounds, the capacity of the system is 5.00 gallons
(30.90/6.180). The weight of liquid required to fill the system shall be determined by one or more measurements of containers before and after their contents have been poured into
the fuelsystem. The containers shall contain at least 3.0 gallons during the "before" measurement. The contents shall be poured into the fuelsystem until the container is
empty or until the fuel system is full, whichever occurs first. The temperature of the liquid poured into the system shall be kept as close as possible to the temperature used to
determine the density of the liquid, as described below. When gasoline is used, it must be from the same batch of gasoline used to determine fuel density. The scale used to
measure the weight of liquid dispensed shall be repeatable to 0.01 pounds and calibrated with an NIST-traceable dead weight.
18
Determining the Density of Water:
For water at 60o F, the density shall be assumed to be 8.337 pounds per gallon. At 70o F, the density shall be assumed to be 8.328 lbs/gallon. For other temperatures, the
density of water shall be determined from standard engineering tables or using the following formula:
lbs/gal = 8.3286 +(0.000985*T) - (0.000014*T2), where T isthe temperature in degrees Fahrenheit.
Determining Fuel Density:
The density of the fuel shall be determined by the weight of fuel required to fill a rigid, narrow neck "calibration vessel" of known volume in excess of 1.5 gallons. The
volume of the "calibration vessel" shall be determined by measuring the weight and temperature of water required to fill the vessel. The temperature of the water used to
calibrate the "calibration vessel" shall be measured with a thermometer accurate to two degrees Fahrenheit (F) and shall be within the range of 39o F to 100o
F. The density of the water shall be determined as specified above. As an example of using this approach, if the temperature of the water is 70o
F and the weight of water needed to fill the calibration vessel is 14.58 pounds, then the volume of the calibration vessel is 1.751 gallons (14.58/8.328). If the weight of gasoline required
to fill the calibration vessel is 10.82 pounds, then the density of the gasoline is 6.179 lbs/gallon (10.82/1.751).
Alternatively, the density of the fuel may be determined using a precision hydrometer with a resolution of 0.001 specific gravity or less. As an example of using
this approach, if the specific gravity of the gasoline measured by the hydrometer is 0.742, then the density of the gasoline is 6.186 lbs/gallon (0.742 * 8.337). (Note that the
hydrometer will determine the specific gravity of the gasoline relative to water at 60F. The temperature of the gasoline does not have to be at 60F, but the temperature of the
gasoline used to fill the tank must be equal to the temperature at which the specific gravity of the gasoline was measured.)
II. Auxiliary Fuel Tanks
1. Expansion of the stock (OEM) fuel tank is permitted, provided that such expansion is of similar material, gauge, and construction as that of the stock fuel tank and, when
viewed from the side, no portion of the modified tank surface, from the point closest to the front of the seat to its highest point, is at an angle of more than 45 degrees above
horizontal.
2. Non-OEM main fuel tanks and auxiliary tanks are permitted if they are NASCAR-, IHRA-, or NHRA- approved or, at the discretion of the rallymaster or the president,
determined to be of acceptable quality.
3. Any auxiliary tank(s) shall be mounted in a secure manner so as to minimize the chance of its becoming separated from the motorcycle. For a list of auxiliary systems that will meet rally specifications, see §III.F. Metal containers are allowed. However, thin-walled containers such as those used in marine or snowmobile applications are prohibited.
Approval of attachment systems rests at the discretion of the rallymaster or the president.
4. All fuel lines must be routed so as not to interfere with the operation of the motorcycle.
5. An electric fuel pump, if used, must be properly wired and fused, and the refueling
inlet of the auxiliary tank must be grounded.
6. The auxiliary tank(s) must be properly vented for pressure buildup and overflow.
7. Anti-slosh foam or anti-slosh baffles will be required for cells mounted on the pillion seat or the rear rack of the bike unless the maximum volume of the tank does not exceed
1.0 gallon. A minimum of 80% of the dry capacity of the auxiliary tank must be filled with anti-slosh foam, or the tank must be equipped with one or more longitudinallyplaced baffles that are at least 80% of the height of the tank and that divide the tank into two or more chambers of approximately equal volume. The rallymaster or the president
may approve alternative configurations that are determined to provide effective control of sloshing. Taildragger cells, cells no higher than the top of the OEM tank, and enlarged
fuel tanks in the OEM tank location (i.e.: Touratech tanks) are exempt from this requirement.
8. Fuel may not be carried in excess of the quantities set forth in this section, or in containers not complying with the above standards, unless expressly approved in advance
by the rallymaster or the president. When pressure is applied to the fuel cell, limited visible movement (i.e., 1/2") relative to the frame of the
motorcycles will be permitted only if it is due to the compression of padding on which the tank is positioned. However, all tanks must be secured to the motorcycle with straps or fasteners that are securely connected to a bracket or structural member that does not flex when pressure is applied to the auxiliary tank. No bungee, shock cord, or similar attaching device will be permitted.
19 Non-metallic auxiliary tanks should be grounded to the frame of the motorcycle with a conductive strap or wire attached to the tank in the vicinity of the fuel inlet. Metal tanks do not require a grounding strap if they are attached to the frame with conductive brackets.
20 A vented gas cap is not sufficient unless it is determined that sufficient vapor space exists in the auxiliary tank, after it has been filled to capacity, to prevent the expulsion of liquid fuel when the motorcycle sits in the sun on either the centerstand (if so equipped) or the side stand. Unless there is sufficient vapor space to prevent the expulsion of liquid fuel from the vent, there must be a hose attached to a vent located at the highest point on the tank when the motorcycle is sitting on its sidestand. The entrance to the vent line must be flush with the top of the tank so that it is not submerged when the tank is full. Vent hoses must be routed in such a manner as to prevent any expelled fuel from coming into contact with any part of the motorcycle or from being expelled into the path of a tire or onto a tire.
Here are the rules that were in place in 2021:
Appendix A: Fuel system capacity and auxiliary tanks
I. Fuel System Capacity
Fuel system capacity for motorcycles using liquid fuel will be determined by the method specified below. For motorcycles that do not use liquid fuel, the capacity shall be
determined on a case-by-case basis to ensure that the “gasoline-equivalent” fuel capacity of the motorcycle does not exceed 11.5 gallons (on an energy basis).
1. Original Equipment Tanks
For original equipment (OE) tanks, the manufacturer's specified capacity shall be used unless the IBR has published alternative specifications 90 days in advance of the
event. In the case of conflicting manufacturer's specifications, and in the absence of an alternative specification published by the IBR, the highest capacity published by the
manufacturer shall be used. For example, in the case of the BMW R1100RT, the highest capacity specified by the manufacturer is 7.26 U.S. gallons, which our measurements
confirm is the correct capacity.
2. Modified Tanks, After-Market Tanks, and Auxiliary Fuel Systems
The capacity of all non-OE elements of a fuelsystem shall be determined by the amount of water or fuel required to fill and empty system (including lines, pumps, filters,
etc.). Water may be used to measure individual tanks or whole systems. However, we will usually use premium grade gasoline unless the motorcycle is designed to run on an
alternative fuel (e.g., Diesel fuel). For systems equipped with a fill pipe that extends into a vapor space, the capacity will be determined by filling the system to the bottom of the
fill pipe, unless the system has been modified in some manner to permit a fill rate in excess of 1.0 gallons per minute above the bottom of the fill pipe.
The volume of liquid required to fill the system will be calculated based on the weight of the liquid required to fill the tank and the density of that liquid. For example,
using gasoline with a density of 6.180 pounds per gallon, if the weight of gasoline required to fill the system is 30.90 pounds, the capacity of the system is 5.00 gallons
(30.90/6.180). The weight of liquid required to fill the system shall be determined by one or more measurements of containers before and after their contents have been poured into
the fuelsystem. The containers shall contain at least 3.0 gallons during the "before" measurement. The contents shall be poured into the fuelsystem until the container is
empty or until the fuel system is full, whichever occurs first. The temperature of the liquid poured into the system shall be kept as close as possible to the temperature used to
determine the density of the liquid, as described below. When gasoline is used, it must be from the same batch of gasoline used to determine fuel density. The scale used to
measure the weight of liquid dispensed shall be repeatable to 0.01 pounds and calibrated with an NIST-traceable dead weight.
18
Determining the Density of Water:
For water at 60o F, the density shall be assumed to be 8.337 pounds per gallon. At 70o F, the density shall be assumed to be 8.328 lbs/gallon. For other temperatures, the
density of water shall be determined from standard engineering tables or using the following formula:
lbs/gal = 8.3286 +(0.000985*T) - (0.000014*T2), where T isthe temperature in degrees Fahrenheit.
Determining Fuel Density:
The density of the fuel shall be determined by the weight of fuel required to fill a rigid, narrow neck "calibration vessel" of known volume in excess of 1.5 gallons. The
volume of the "calibration vessel" shall be determined by measuring the weight and temperature of water required to fill the vessel. The temperature of the water used to
calibrate the "calibration vessel" shall be measured with a thermometer accurate to two degrees Fahrenheit (F) and shall be within the range of 39o F to 100o
F. The density of the water shall be determined as specified above. As an example of using this approach, if the temperature of the water is 70o
F and the weight of water needed to fill the calibration vessel is 14.58 pounds, then the volume of the calibration vessel is 1.751 gallons (14.58/8.328). If the weight of gasoline required
to fill the calibration vessel is 10.82 pounds, then the density of the gasoline is 6.179 lbs/gallon (10.82/1.751).
Alternatively, the density of the fuel may be determined using a precision hydrometer with a resolution of 0.001 specific gravity or less. As an example of using
this approach, if the specific gravity of the gasoline measured by the hydrometer is 0.742, then the density of the gasoline is 6.186 lbs/gallon (0.742 * 8.337). (Note that the
hydrometer will determine the specific gravity of the gasoline relative to water at 60F. The temperature of the gasoline does not have to be at 60F, but the temperature of the
gasoline used to fill the tank must be equal to the temperature at which the specific gravity of the gasoline was measured.)
II. Auxiliary Fuel Tanks
1. Expansion of the stock (OEM) fuel tank is permitted, provided that such expansion is of similar material, gauge, and construction as that of the stock fuel tank and, when
viewed from the side, no portion of the modified tank surface, from the point closest to the front of the seat to its highest point, is at an angle of more than 45 degrees above
horizontal.
2. Non-OEM main fuel tanks and auxiliary tanks are permitted if they are NASCAR-, IHRA-, or NHRA- approved or, at the discretion of the rallymaster or the president,
determined to be of acceptable quality.
3. Any auxiliary tank(s) shall be mounted in a secure manner so as to minimize the chance of its becoming separated from the motorcycle. For a list of auxiliary systems that will meet rally specifications, see §III.F. Metal containers are allowed. However, thin-walled containers such as those used in marine or snowmobile applications are prohibited.
Approval of attachment systems rests at the discretion of the rallymaster or the president.
4. All fuel lines must be routed so as not to interfere with the operation of the motorcycle.
5. An electric fuel pump, if used, must be properly wired and fused, and the refueling
inlet of the auxiliary tank must be grounded.
6. The auxiliary tank(s) must be properly vented for pressure buildup and overflow.
7. Anti-slosh foam or anti-slosh baffles will be required for cells mounted on the pillion seat or the rear rack of the bike unless the maximum volume of the tank does not exceed
1.0 gallon. A minimum of 80% of the dry capacity of the auxiliary tank must be filled with anti-slosh foam, or the tank must be equipped with one or more longitudinallyplaced baffles that are at least 80% of the height of the tank and that divide the tank into two or more chambers of approximately equal volume. The rallymaster or the president
may approve alternative configurations that are determined to provide effective control of sloshing. Taildragger cells, cells no higher than the top of the OEM tank, and enlarged
fuel tanks in the OEM tank location (i.e.: Touratech tanks) are exempt from this requirement.
8. Fuel may not be carried in excess of the quantities set forth in this section, or in containers not complying with the above standards, unless expressly approved in advance
by the rallymaster or the president. When pressure is applied to the fuel cell, limited visible movement (i.e., 1/2") relative to the frame of the
motorcycles will be permitted only if it is due to the compression of padding on which the tank is positioned. However, all tanks must be secured to the motorcycle with straps or fasteners that are securely connected to a bracket or structural member that does not flex when pressure is applied to the auxiliary tank. No bungee, shock cord, or similar attaching device will be permitted.
19 Non-metallic auxiliary tanks should be grounded to the frame of the motorcycle with a conductive strap or wire attached to the tank in the vicinity of the fuel inlet. Metal tanks do not require a grounding strap if they are attached to the frame with conductive brackets.
20 A vented gas cap is not sufficient unless it is determined that sufficient vapor space exists in the auxiliary tank, after it has been filled to capacity, to prevent the expulsion of liquid fuel when the motorcycle sits in the sun on either the centerstand (if so equipped) or the side stand. Unless there is sufficient vapor space to prevent the expulsion of liquid fuel from the vent, there must be a hose attached to a vent located at the highest point on the tank when the motorcycle is sitting on its sidestand. The entrance to the vent line must be flush with the top of the tank so that it is not submerged when the tank is full. Vent hoses must be routed in such a manner as to prevent any expelled fuel from coming into contact with any part of the motorcycle or from being expelled into the path of a tire or onto a tire.
I'm not clear how one grounds a non-metallic, non conductive tank. Maybe @Larry Fine has some ideas? Would tying the plastic tank to the motorcycle with nylon rope fulfill this requirement?
I had installed a new meter box on the side of a single family residence years ago. I used PVC pipe* for the riser from the meter box to the weatherhead. The city's inspector looked at it, and asked me to replace the plastic bushing with a grounding bushing on the end of the PVC pipe. I told him that would do nothing at all since the plastic pipe was non conductive. He had to call the chief for clarification but eventually backed down and approved my installation as is.
*Schedule 80 for the armchair electricians
Plastic can be conductive to static electricity. A drain wire would be a more accurate term.
While something like a copper screen formed into a cylinder and inserted into the filler tube (and grounded to the frame) might mitigate static charges, you cannot ground a nonconductive tank. If the material is non-metallic and is conductive (say carbon fiber and epoxy), then it is a different story. And, I disagree, plastic does not conduct static electricity, though we might be arguing semantics here.
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It is long been advised to remove portable metal & plastic gas containers from vehicles and set them on the ground before filling. The reason seems to be because flowing gasoline tends to build up static electricity and plastic or rubber underneath the container prevents the static charge from passing into the ground. With no easy path to ground the static electricity goes to ground through a spark to the pump nozzle igniting the fuel. Metal containers are most at risk but plastic containers have also caused fires.
And I agree, conducting is the wrong term.
Plastic sliding boards and tubes require static drain.
They will make the tank to your print. I would think they could "engineer" the tank to be a specific volume and standards if you wanted to pay for that service.
Ron, they CAN do it and I'm sure that if you give them accurate plans you'll get what you asked for -- but they still won't guarantee the volume. If you're over the limit you are over. Now you're sad.
Also, note that the IBR accepts whatever the manufacturer says the stock fuel capacity is. Honda changed that number around 2007. It was 7.2 gallons from 7.6. I can't tell that they actually changed the bike but if you build an aux tank using the 7.2 number and find out later that you have a year rated at 7.6 you'll be sorry yet again.
One of best stories I have heard about someone being over capacity at the tech inspection involved reducing the aux tank capacity by feeding a length of chain down into the aux until the capacity came into compliance. Let's hope your baffles let you feed that much logging chain in there. Others have had to remove their aux tanks and some have had to beef up their mounting systems so that it will withstand the "Warchild Shake Test". I saw one guy with his aux tank mounted via four RAM arms. Not optimal.
"I saw one guy with his aux tank mounted via four RAM arms. Not optimal."
Perhaps not, but I'm pretty sure that guy was Jim Owen in the 2015 IBR (he placed 5th in that one), 3-time IBR winner.
I remember thinking it was pretty strange when I saw it in the parking lot, but it was rock solid, at least enough to pass tech inspection.
Eric
#531
Perhaps not, but I'm pretty sure that guy was Jim Owen in the 2015 IBR (he placed 5th in that one), 3-time IBR winner.
I remember thinking it was pretty strange when I saw it in the parking lot, but it was rock solid, at least enough to pass tech inspection.
Eric
#531
OP
OP
Clayshooter08
Site Supporter
THIS IS WHAT I'M THINKING ABOUT GOING WITH, JUST UNDER 3 GALLON!!!
Andrew Shadow
Site Supporter
Would you what data source they use by any chance? Would a person be safe if, for a Honda, they go by what volume is listed in the Honda Service Manual? Or is it possible that they use some other source that potentially could be different?
I know that they use the manufacturers number (spec). I don't know what source they use, but it may be the service manual.
Didn't I see, in the posted IBR pictures, their officials measuring the fuel poured into the tanks? Or was that just the auxiliary tanks?
They do not measure the stock tanks, just take the manufacturers word for it. It takes a whole chemistry set to measure the aux tank volume and includes invocation of specific gravity among other things. To me, specific gravity is when I hit the pavement. Very specific form of gravity. But my tank passed and they rated it as holding less fuel than I thought it did. I was .2 gal under the limit.
I sure have gotten used to having two aux tanks mounted up. On a good day I can go 500 miles without putting a foot down.