fuel pump wont run after replacing with new pump

75

Asked by Jul 04, 2014 at 06:07 PM about the 1998 Ford F-150

Question type: Maintenance & Repair

have a 98 f150 thought the pump died wouldn't start one day checked fuses and relays all good so figured had to be the pump. bought new pump tested and it works, so I replaced pump got it done went to start pump still not engaging... tested old pump at this time and it works also... GREAT... $$$.... so we tested power to pump and are getting voltage tested the reset switch and it too has power any thoughts on what else it could be...??? all my coworkers and I are stumped

7 Answers

59,935

Have you checked for fire at plug wire?

75

yes we also checked that, it tries to crank but I still don't hear the pump turn on we just took the line off the pump and tried to turn over no fuel coming out

3 out of 3 people think this is helpful.
59,935

If you have replaced all relay,s and fuse,s,could have a bad ecm/Brain.

75

that don't sound good......

75

just was playing around and being that I was getting power to the pump I decided to test the ground so I cut the ground wire and hooked the ground that I ran from the neg. side of the battery and it fired right up. so turns out I had a bad ground...

4 out of 4 people think this is helpful.
90

you hooked a ground wire to were?

9 out of 9 people think this is helpful.

My brother 96 Chevy I had been working also had a problem like yours. A bad ground was also the problem so I had sanded the rust off the cross member (where it was grounded with a bolt) and it has no problem firing up

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