Fuel Pump Problems, need advise

devro

devro

Joined
Dec 21, 2010
Messages
68
Location
London, Arkansas
Bike
09 ST1300
2009 ST 1300a
I'm asking for help to make sure I'm going in the right direction before I pull/replace the fuel pump.
The fuel pump is not working.
Does not momentarily run when the ignition is turned on.
I read and used an extensive write-up on how to check the relays, bank angle sensor, ect., ect. Attached. (Thank you JF Heath, from Australia I think, and ST-Owners.com).
Everything seems to be working as it should. ( I must note I am not a pro at checking electrical components, but not ignorant either.)

When I check the power at the three prong plug that goes to the pump I find this:
Right prong is Ground, and it is grounded.
Center prong: I get 11.19 volts when the ignition is on.
Left prong: I get 12.04 volts for maybe 1 second when the ignition is switched on.

It seems to me the electronics are working and the problem is the pump.
Does that sound right to you?

If you have any advise or tips or anything please let me know.
If you have any tips on replacing the pump please let me know.

The entire pump assembly from Honda is expensive. I've seen threads where just the pump can be replaced. If anyone has any experience with replacing just the pump I'd sure like to hear from you.

Thank you.
 

Attachments

  • ST1300 - Fuel Pump Circuit - Answers on Back Page.pdf
    1 MB · Views: 8
If you have confirmed that you do have 12V+ at the fuel pump when you turn the ignition on, and you have confirmed that the fuel pump is properly grounded, the problem is that the ECM is not turning on the fuel pump.
To test the fuel pump bypass the entire fuel pump electrical circuit. With the key in the off position, apply 12V+ directly to the brown wire on the fuel pump connector. Does the fuel pump run?
Note: This tests the electrical side of the fuel pump, not the pressure or volume output.

Do you have any fault codes? Any fuel injector failure will cause the ECM to deactivate the fuel pump.
Are there a lot of mice in your area? Mice like to chew the wires underneath the throttle bodies and are a common cause of fuel pump issues. One damaged wire under there and the ECM will disable the fuel pump. Inspect the wiring harness for damage.
 
Thanks Andrew.
Before I do this I have 2 questions:
*There is a brown wire and a brown with black stripe. Which one?
I will do this from the plug to the pump.
*Should I run a ground to the ground on the tank lid?
 
Andrew Shadow said:
If you have confirmed that you do have 12V+ at the fuel pump when you turn the ignition on, and you have confirmed that the fuel pump is properly grounded, the problem is that the ECM is not turning on the fuel pump.
To test the fuel pump bypass the entire fuel pump electrical circuit. With the key in the off position, apply 12V+ directly to the brown wire on the fuel pump connector. Does the fuel pump run?
Note: This tests the electrical side of the fuel pump, not the pressure or volume output.

Do you have any fault codes? Any fuel injector failure will cause the ECM to deactivate the fuel pump.
Are there a lot of mice in your area? Mice like to chew the wires underneath the throttle bodies and are a common cause of fuel pump issues. One damaged wire under there and the ECM will disable the fuel pump. Inspect the wiring harness for damage.
Click to expand...
The pump does not run when directly connected to 12v. I hear a faint "click", that's all.

I've searched and can not find any information on where the Diagnostic Connector is.
Once I find it, how do I read it?
The FI Indicator is not on or blink.

Thanks Andrew, I owe you a lunch.
 
Last edited:
To locate the data link/diagnostic connector, click the below link;

Data Link Cable/Connector | ST1300 Related

I recently bought a 2015 ST1300. And today I picked up a gear indicator. It says it needs to be connected to the Data Link Connector and is compatible with my bike, but it doesn't provide a drawing or pic of the right connector and where it is. To add to my confusion my bike was a police bike...
www.st-owners.com www.st-owners.com

To check for, read, and clear fault codes, click the below link;

New to ST1300 ownership-- learning quickly about FI light and issues.... HELP! | ST1300 Related

The ECM has a voltage failure on the 25/26 port aka the knock sensors. You can replace it with any of the four ECM models or buy a new one. It's not the harness, save yourself the hassle and don't break it. 4 ECM models? Please explain!
www.st-owners.com www.st-owners.com
 
Jeez, I didn't know it was hidden!. And I didn't know it was called the Data Link Cable, or I would have found it in a search.
I don't think I have any fault codes. But maybe I will once I get it started.

I'd bring ya lunch, but my bike wont start.....LOL
 
I thought I'd let you know:
I pulled the pump assembly. I put 12v directly to the pump plug, it made a very slight hum but didn't run.
Now it's time to research what pump, filter, ect to buy.
If you have any recommendations let me know.
Right now I'm considering a Quantum pump assembly from eBay. It comes with everything, even the gasket.
I'm going to start another thread asking about pumps.
Thanks again for the help. When I get it running I'll let you know.
 
Do a search for fuel pump - especially any posts by @Uncle Phil, though a number of guys have posted links. IIRC, a honda car's fuel pump works fine (don't remember the specifics) but Amazon sells a cheap pump that more than a few guys have used successfully. Beware of the fuel hose though - many of these aftermarket pumps come with a hose that falls apart when immersed in fuel (yes, go figure). You will need to buy good fuel line from an auto parts store. It must be rated for direct immersion.
 
SMSW said:
Do a search for fuel pump - especially any posts by @Uncle Phi ......
Click to expand...
No, no, no! Don't tell him that, you'll lead him astray if he follows Phil's lead.
Phil has ST1100's, low pressure fuel system, runs at around 1.5 P.S.I.G..

Devro has an ST1300, high pressure fuel system, runs at around 50 P.S.I.G..
 
devro said:
While we're on the subject of fuel stuff:
What is the capacity of the lower fuel tank? In gallons.
Click to expand...
2.2 US gallons

The Honda ST1300 has a dual-section fuel tank with a conventional tank that holds 5.5 gallons of fuel and a sub-tank that holds 2.2 gallons.
 
Last edited:
Aftermarket fuel pump for late 90s early 2000s Honda Accord is a direct fit for the pump itself. I used a Quantum supplied pump for ST1300 using Honda internal hoses and filter.
 
I want to thank everyone who pitched in with helpful info and advise. New fuel pump and the bike runs like new.
Thanks.
 
You must log in or register to reply here.
Back
Top Bottom