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Topic summary

Posted by Troll
 - November 15, 2024, 14:59:13 PM

It's not that complicated. There are two wires, one is B+, the other, ground. When installed on the bike, the ign. switch sends a signal to the ecm on the "unused" terminal (25?) that says that the ign. has not been bypassed. The ecm will then ground the ground wire and the pump will run. If the ecm doesn't see ignition pulses, it turns off the pump after 2 seconds. If it does see ign. pulses, it keeps the pump on. The B+ terminal of the pump receives power from the fuel pump relay, the ecm just provides a path to ground. Here's the circuit diagram. Since it's a J model, I would be suspicious of the ign. switch. If the ecm doesn't see that low voltage signal, it won't turn on the pump.

Posted by Big Foot
 - November 15, 2024, 11:34:03 AM

I replaced a bad fuel pump. The replacement won't work. I took the pump off and put power to it on the bench. No matter what I do I cant get either fuel pump to come on, on the bench? I understand that there is a start circuit and a run circuit. I can't get either to work?? Any ideas? it seems unlikely that the old pump and the new pump are bad?
Respectfully,
Big Foot

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