Help from car people

[Ly2n]

I have a friend that has a 1991 Infinity G20 with a fuel pump problem. It stopped working, so they decided to replace the pump. The new one doesn't work either. So now they decide to check for power at the pump and there isn't any. They say that the relay is working and sending juice to the pump but it isn't getting there. Now after all of this, they want me to try to fix it. Does anyone know about any tricks that make it appear that the relay is working when it isn't? Is there any way to bypass the relay so that I can check the circuit back to the pump? I did a search on google and couldn't find anything that was helpful. HELP. Lynn

 

[earthman]

Some vehicles have a test wire for the fuel pump which lets you run it independent of the relay (ala older GMs). Why would they assume the pump is bad without testing the circuit first? Second rate mechanics. Assuming the pump and relay are ok, you will have to backtrace the wiring harness for continuity. Most "fuel pump" problems I have seen and experienced are actually broken/corroded wires/connections. Some late model cars also control this circuit via the ECM and not the ignition switch, so that may be another problem area.

 

[Ly2n]

Bump for the morning. I thought about running a test wire. The wiring harness runs in the interior of the car and will be difficult to trace, However if that turns out to be the problem it can be done. Anyone else,

 

[Vette73]

Originally posted by: Ly2n
Bump for the morning. I thought about running a test wire. The wiring harness runs in the interior of the car and will be difficult to trace, However if that turns out to be the problem it can be done. Anyone else,

If the relay is switching on and sedning power but it is not getting there then the only thing left is to start tracing.

 

[earthman]

Trace from the relay plug and the connection at the fuel pump. Don't start tearing up the interior unless you have to. See if you have continuity through the circuit.