Troubleshooting Fuel Pump

[VerySadFace1701]

Hey guys! I'm just going to preface this by saying I'm a bit of a noob to working on motorcycles on my own, so my knowledge is on a beginner level.

I bought a pretty fair 88 Intruder 750 that was mid-project from a buddy of mine, and I'm trying to figure out why the fuel pump is not running when I start the bike.

What I've done:
The bike does get power and does turn over. It runs when you spray fuel into the carbs.

I ripped the fuel pump out to test it. It has 4 wires, so when I put both the signal and hot wires on the positive terminal, and the negative wire on the negative terminal, the fuel pump runs. So what I'm thinking is that somewhere, the pump isnt getting the signal wire's power from ignition.

How can I test this theory, and what are your thoughts?

[Designer]

First, check all the wires to and from the Ignitor and the fuel pump to see if they make good sound connection(s) . From what I know, the 700/750/800 Fuel Pump has an Internal Relay.

Then I'd check to see if the wires to the Fuel Pump/Relay do indeed get energized when you start the bike. It could be the Pump works, but the Relay is defective.

[VerySadFace1701]

Sounds good, I'll start from there, ty! Love your signature btw.

[sgtcall]

Welcome!
Here are a couple of things to check out.

INTRUDER MANUALS AND INFORMATION
viewtopic.php?f=19&t=14168

POSTING PICTURES ON INTRUDERS ALERT
viewtopic.php?f=19&t=13992

[hillsy v2]

Welcome!
Here are a couple of things to check out.

INTRUDER MANUALS AND INFORMATION
viewtopic.php?f=19&t=14168

POSTING PICTURES ON INTRUDERS ALERT
viewtopic.php?f=19&t=13992

There are procedures in the manual to check fuel pump operation and flow rate. Ultimately you can get a 2 wire fuel pump and do away with the relay.

[VerySadFace1701]

Ty! I'm definitely thinking of skipping the relay, that has definitely been a consideration.

[Herb]

I took the relay out of the system for my 1400 years ago. Never had an issue with it since.

[VerySadFace1701]

Heck yeah dude. I'm getting a new electric fuel pump with two wires now. It should be the one that shuts off at a certain psi, any suggestions on which one I should get?

[Designer]

Heck yeah dude. I'm getting a new electric fuel pump with two wires now. It should be the one that shuts off at a certain psi, any suggestions on which one I should get?

Couldn't you use the Pump you have and bypass the Solenoid by hooking power to only the wires that energize the Pump itself?

Tryin' to save you SumOfYer hard-earned $$$.

[hillsy v2]

Heck yeah dude. I'm getting a new electric fuel pump with two wires now. It should be the one that shuts off at a certain psi, any suggestions on which one I should get?

Any fuel pump that is for carbs will work pressure wise. It should be between 2 to 5 psi.