Community Forums

sesdawg · 02-09-2014, 08:13 PM

My fuel pump has no power checked everything power at the relay but none coming out changed the relay and fuel pump nothing it's a 1994 454 engine p30 chassis Tbi fuel injection changed computer as we'll just a shot but nothing as we'll any help would be great

BFlinn181 · 02-09-2014, 08:38 PM

Quote:

Originally Posted by sesdawg

My fuel pump has no power checked everything power at the relay but none coming out changed the relay and fuel pump nothing it's a 1994 454 engine p30 chassis Tbi fuel injection changed computer as we'll just a shot but nothing as we'll any help would be great

Punctuation can be your friend.

I think you said you replaced fuel pump relay AND the fuel pump and it didn't work. Then you also changed the ECU and still no results? If you've got power through the relay, but none at the fuel pump, look for a fuse or bad connection between the relay and pump.

sesdawg · 02-09-2014, 09:25 PM

Yes I changed the fuel pump. I also changed the relay and ECU, and I have changed the oil pressure switch. I do not have power coming out the relay. It was running before I started this but was missing and was acting like a fuel pump I changed it,(fuel pump) it ran for a few minutes but starting running rough then stop running and has not started since. I took new fuel pump back got another one that's when I found out that I had no power to pump. Please help

Thanks

BFlinn181 · 02-09-2014, 09:41 PM

Have you changed the fuel filter? Could be starved for fuel due to blockage. Use a short jumper wire to bridge the contacts in the relay socket and see if power is getting to pump.

hometool · 02-09-2014, 09:42 PM

I would try powering the pump direct with a jumper wire and see if it will run if it does start and run you need to track down the trouble. does the system have a crash switch that cuts out the pump in case of a collision?

sesdawg · 02-09-2014, 10:05 PM

Will try that tomorrow. It does not have a fuel cut off switch, the oil pressure switch serves that purpose.

SuperGewl · 02-10-2014, 03:35 AM

Quote:

Originally Posted by hometool

I would try powering the pump direct with a jumper wire and see if it will run if it does start and run you need to track down the trouble. does the system have a crash switch that cuts out the pump in case of a collision?

Yep that is what I would look for. The Fords have a rollover sensor that must be reset under the dash near the gas pedal. Check the Owners manual and see if it mentions that someplace. The other thing is the ignition switch may be faulty.

keepmovin · 02-10-2014, 08:45 AM

With the dog house off, look at the back left side of your tranny for a cable connector hanging there. Power back to the fuel pump routes through that connector. Wiggle it or unplug, clean, and reconnect.

sesdawg · 02-10-2014, 06:11 PM

I jumped the wire at the relay, pump will run . But the engine would not run. The injectors do not shoot gas. I got ingnition switch will try putting it in tomorrow. This model does not have a fuel cut off switch, checked Manuel again. I also cleaned all the grounds I could find.

Kazoo Tom · 02-10-2014, 06:20 PM

If you jumped the connections at the relay and the pump powered up, then it would be reasonable that the relay has gone bad. Once you have the pump running, you might check the fuel filter, or maybe some sort of clog in the fuel line.

sesdawg · 02-10-2014, 06:56 PM

I have put two new relays just to see if it was blowing them. I will check to see if the gas is pumping to throttle body, I put a new fuel filter on it forgot to mention that. Thanks for the help keep the ideals coming I'm willing to try anything at this point.

keepmovin · 02-10-2014, 09:18 PM

Youi should have 26 to 32 psi of fuel pressure up to those fuel injectors. Fuel goes to the injectors and then just past them is a pressure regulator that bleeds fuel back to the tank in the return line. Possible that diaphragm has failed is is just letting full flow back to the tank.

89sandman · 02-11-2014, 12:09 AM

I don't have a wiring diagram here in front of me but if you hot wire the pump and you have correct fuel pressure and the injectors are not pulsing the probable cause would be the ignition module.

joemcgin · 02-11-2014, 05:09 AM

My 2000 Adventurer had a mystery fuel pump issue last fall. We replaced the fuel pump & filter and still had intermittent issues with not supplying fuel. My mechanic traced the wires from the motor to the fuel tank and says he found a wiring harness halfway down the drivers side of the frame that had a loose wire in it that he repaired. Haven't had an issue since. Wish we tried this first as the pump probably didn't need to be replaced.