Fuel pump relay problems

1 report

Ralph from United States 7 months ago

If no power at pump make sure you don’t have a short to ground to that circuit yank on harness to see if any change if not check for continuity in that circuit possible break in harness

Robert's repair from United States 2 months ago

I had same issue. It's the fuse box it's self! Under rear seat there is a TSB about it. Easiest fix is replace fuse box. I took mine apart and fixed it. But I don't recommend doing it it was a PIA to do. You can get by for a little while by twisting the legs of the relay and fuse just a little , to help make a good connection. But it will only last 75-100miles before it blows or just loses connection again. Good luck

Comment

I replace old fuel pump with a new one but truck won't start I check t

Ford F-150 2001 F150 5.4 L super duty cab 4x4 24396 miles

Truck won't start fuel pump relay and fuses are ok and also checked for fuel pressure didn't have any pressure out of shrader valve and i also checked to hear if the pump was turning on at the fiiller but I didn't hear it come on also have the theft like blinking could there be short in the wiring to cause the pump not to turn on or is the theft light causing these problems need some advice or answers.

Bossman from United States 9 years ago

7 reports

Hoss from Canada 9 years ago

Check your fuel pump driver module...usually located on the frame above the spare tire. Aluminum bolted to steal and we'll the rest is self explanatory. That's what mine looked like when I pulled it off my 2008 f150 XLT 5.4L. Replaced it and I'm back in business...Good luck

Bubba123re from Canada 6 years ago

Possable no ground to pump maybe youjust got crap pump. Try puting 12 v direct to pump

Terry C. from United States 4 years ago

Mine looked even worse than yours. The whole back crumbled when I took it off the frame. Good old Minnesota winter with plenty of salt on the roads.

Comment

No power to fuel pump

Ford F-150 1991 XLT Lariat 125000 miles

I have the 12plus volts to the fuel pump relay and no power at the fuel pump. I've wired it from the relay. And i can hear the fuel pump running but it still wont start.

Ricky from United States 7 years ago

5 reports

Bubba123re from Canada 6 years ago

Why was pump changed out, may still have pluged fuel filter or other fiter in throttle body restrictions. Sometimes you have to just open line at pump and move forward, also late modle forde had a black box under dash to cut fuel accident or roll over reset button on top

Comment

Injectors not working

Ford F-150 1993 F150 168000 miles

Fuel pump relay not pulling in if I jump it out fuel pumps will run, if I spray gasoline into intake engine runs fine seems like I'm not getting any injector pulse what part would give the PCM the input to allow injector pulse any help appreciated thank you

Pardue60 from United States 4 years ago

1 report

Bruce from United States 4 years ago

If the fuel pump relay is not pulling in and you are not getting any injector pulse, there could be a problem with the PCM (powertrain control module) or with a component related to the fuel injectors.
Here are a few things you can try:

Check the fuel pressure. If the fuel pressure is too low, the injectors may not be getting the fuel they need to function properly. Use a fuel pressure gauge to check the pressure at the fuel rail. The pressure should be within the manufacturer's specified range.
Check the fuel pump. If the fuel pump is not functioning properly, it may not be able to provide the fuel pressure needed to activate the injectors. You can test the fuel pump by listening for a humming noise when the key is turned to the "on" position.
Check the fuel pump relay. If the fuel pump relay is not functioning properly, it may not be providing power to the fuel pump. You can test the fuel pump relay by jumping it out, as you mentioned.
Check the wiring. Check the wiring harness and connectors for any loose, damaged, or corroded wires. Make sure all connections are secure and free of any visible damage.
Check the PCM. The PCM is responsible for controlling the fuel injectors, and if it is not functioning properly it may not provide the necessary input to allow injector pulse. You may need to have the PCM checked and possibly replaced.
I recommend having a mechanic diagnose and repair this issue to ensure that the problem is properly addressed and the vehicle is safe to drive.

Comment

Electrical gremlins

Ford F-150 2012 Stx 3.7 4x4 extended cab 140000 miles

Turn lights stay on No communication inside to outside 4x4 won’t engage 3 codes- p1891-00 c1979-11 and some other for tire sensor didnt save lol Things I’ve checked repaired replaced etc 1. New battery 2. New alternator 3. Made sure all BCM plugs clean and lubed 4. Cleaned and lubed all grounds 5. All fuses checked 6. Fusible link(battery fuse) replaced 7. Removed all aftermarket led/ install factory 8. Had bcm software malfunction corrected 9. Reset all codes(numerous times) 10. Checked continuity through trans to pcm harness. 11. Downloaded forscan attempted relearn bcm 12. Tried deleting a… Read complete

Wally from United States 11 hours ago