Fuel Pump click - Not priming

[xanth]

The truck dosent really like to start when sitting overnight. It'll start on the third try (crank, release key, crank, release key, crank - start!)

cant hear the fuel pump priming. Jumpered the fuel pump test wire near the firewall and can hear the pump clicking, but dosen't sound like priming.

Just got the engine installed (have 100 miles on it). Once it starts, runs good (as far as I know). Whenever I stop, it'll start right back up no issues. Only time it dosent like to start is when it sits overnight.

ECMB fuse is good. Any ideas? I would think the pump is going out, but considering it will start (eventually) and runs fine, makes me wonder.

 

[Don W.]

Re: Fuel Pump click - Not priming

FWIW I agree. Your pump is bad. It might be the relay but from what you say I'd bet on the pump. Once it sits for awhile it "sticks." I'd bet a nickle that if you drove the truck and then parked it for, say, most of the day it wouldn't start again.

Next time hot wire the pump (empty blade connector near the dist) and go bang on the fuel tank and see if the pump doesn't start to run.

 

[xanth]

Re: Fuel Pump click - Not priming

Thanks for the reply.

It seems to have ~30 PSI with the pump check wire jumped.

Idling, it has ~42 w/FPR disconnected.

Can't say I've ever had a FP fail, do they normally fail like that? Will i be driving it one day and wam, it just wont drive anymore?

 

[Don W.]

Re: Fuel Pump click - Not priming

Thanks for the reply.

It seems to have ~30 PSI with the pump check wire jumped.

Idling, it has ~42 w/FPR disconnected.

Can't say I've ever had a FP fail, do they normally fail like that? Will i be driving it one day and wam, it just wont drive anymore?

Yes, they can fail like that. The question is does the pump run normally, using the jumper, leaving the key off, first thing after sitting overnight? If not then it's prolly the pump. If it does run then the problem -may- be elsewhere. You might have gotten lucky that morning. Try again the next morning to be sure.

FP doesn't matter here because when it does run all is well. It's only when it doesn't run that there's a problem.

Different vech. but a friend struggled for what must have been a year with a Ford pu that would occasionally and randomly not start. It was the fuel pump.

 

[Sy229]

Re: Fuel Pump click - Not priming

I have a similar problem w/ my Ty, although a second stab of the ignition turns it over (vice 3). I agree w/ Don that its likely the fp - I've got a Walbro waiting for me to install. You may want to do a fuel filter swap first, though. It's cheap and easy and may mitigate the problem some while you line up the new fuel pump.

 

[gaugeprower]

Re: Fuel Pump click - Not priming

Ok Im having kind of a similar problem (not trying to hi-jack) Every once in a while the pump wouldn't prime and the truck wouldn't start, just crank. But after a while, when it did prime, it started and ran and drove fine. I thought the pump was bad (it kinda was) and replaced it with a brand new one, and thought the problem was solved. However, it happened again... what power wiring runs to these pumps? Maybe there's a bad ground or something somewhere, or is this priming controlled by the ecm? I'm new to this...