No Power to Fuel Pump

[noahc00]

Hello, I have a 1988 Ford Ranger Custom that won’t start. I know it’s because of the fuel pump because I don’t hear it prime at all. No power is being sent to it and I tested the fuel pump itself to see if the motor was the problem but no, it works just fine when I send 12 volts directly to it. Ive tried so many things to see what else is the problem from the inertia switch to the relay but I’m out of options and don’t want to take it back to the mechanic. Any and every advice/suggestion is recommended. Thank you

 

[rusty ol ranger]

Hello, I have a 1988 Ford Ranger Custom that won’t start. I know it’s because of the fuel pump because I don’t hear it prime at all. No power is being sent to it and I tested the fuel pump itself to see if the motor was the problem but no, it works just fine when I send 12 volts directly to it. Ive tried so many things to see what else is the problem from the inertia switch to the relay but I’m out of options and don’t want to take it back to the mechanic. Any and every advice/suggestion is recommended. Thank you

Fuel pump gets power from the ECM.

Check for 12v at the relay...if youre not getting juice there then its either the ECM, the wire between the relay and ECM, or maybe the ECM ground.

 

[tw205]

There is a fuel system test port. On the ecm diagnostic connector you can apply a ground to the test port and qith key on should run the pumps. The relay should have two power supplys 1 always hot 1 key on hot. The ecm supplys the ground closing the circuit sending power to inertia switch and pumps.

 

[SenorNoob]

Don't forget about the inertia switch...

 

[rusty ol ranger]

Don't forget about the inertia switch...

He tried that....

 

[sgtsandman]

Change the fuse first. I spent a day troubleshooting my dead fuel pump problem and changing the fuse, that looked perfectly fine but for some brown stuff on the top of the pins. Once I did that, the truck fired right up. It made for a very frustrating day.

 

[DandysRanger]

I'm having the same issue. When I hit the key I don't hear the fuel pump go on. When I used the fuel test port (Thanks @tw205) I hear the relay click and the HP pump turn on. Does this point to the ECM? I recently had it refurbished by ECUExchange.

 

[SenorNoob]

I hear the relay click and the HP pump turn on. Does this point to the ECM?

Or a bad wire between the 2.

 

[tw205]

Both pumps run off the same circuit, same power. I would pull the connection off the tank and check for powe r. Four pin connection I believe the outer pins are power and ground.