fuel pump relay - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 33 (permalink) Old 05-13-2006, 02:33 AM Thread Starter
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fuel pump relay

ok guys here goes... about 2 weeks ago i stop to get fuel i shut the truck off i put fuel in her and go into pay come out get in the truck and turn the key wait for the light go to start it and it wont start :barf: :umno: this cant be happening.... so i look up and my fuel pres guage reads 0 so i get out and pull the fuel pump relay and swap in the hvac relay :Thumbup: starts right up and im on my way.. so tonight i go out to taco bell.. the lady asks me to turn off my truck to order so i do i go to start it back up NOTHING AGAIN! no fuel pressure so i open my glovebox and get out one of the backup relays i bought after the first mishap... put it in and vroom were up and running again....now im getting peeved... pull into the drive and just for ****s and giggles i shut it off turn the key back on about 30 sec later no fuel press again... so i shove the relay i took out at taco bell back in and turn the key... FUEL PRESSURE YAY!!! no im REALLY pissed off whats going on with this thing guys...
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post #2 of 33 (permalink) Old 05-13-2006, 03:26 AM
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Sounds like it might be a connection loose in the relay block. I'd try to remove and reinstall the same relay next time it does it.:shrug:

If just wiggling the relay gets the pump to work that would confirm a bad relay plug connection..

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post #3 of 33 (permalink) Old 05-13-2006, 03:37 AM Thread Starter
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but things dont get "get back connections" specially seein how i hadnt even opend the cover for those relays since i bought it almost 2 years ago oh and its an SOB to pull out
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post #4 of 33 (permalink) Old 05-13-2006, 04:00 AM
 
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your pump fuse has not blown? have you ever replaced the pump fuse?? i ask because the last time i replaced a fuel relay someone jamed a piece of wire in place of the fuse.:evil: the pump was going bad and would pull alot of amps,the wire was heavy enugh to hold so the relay would get hot and brake connection. start your truck reach under the dash and do a wire wiggel test. grab every wire bundel you can and wiggel it. now do the same on the wires under the hood by the pcm. if you have a biased wire or connection wiggeling will help find the source. you will know if this is the case because your truck will die.:Thumbup: does your fuel pump sound louder or have you seen a psi change lately????
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post #5 of 33 (permalink) Old 05-13-2006, 04:07 AM Thread Starter
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ever since day one of the guages the psi never stays the same changes day to day... its quite annoying
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post #6 of 33 (permalink) Old 05-13-2006, 04:25 AM
 
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what kind of psi are you seeing? your fuel pump may be what is causing the relay to brake connection? seems odd but it can happen.
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post #7 of 33 (permalink) Old 05-13-2006, 05:10 PM
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Ya, that sounds strange? Mine will hold steady at 68-69 unless I'm on it hard then it drops to 60-64... How old is the fuel pump? Have you done the pre pump mods?

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post #8 of 33 (permalink) Old 05-13-2006, 05:49 PM Thread Starter
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it will fluctuate on my guage anywhere from 60-70 i have it set at 70 so it may be the guage not reading right havent looked at the guage on the regulator the pump is stock oem... think i may sell myself and get the rest of the itp fuel system and finish it off
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post #9 of 33 (permalink) Old 05-13-2006, 10:49 PM Thread Starter
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ok so my itp guage on the reg stays firm at 70lbs but my guage in my truck says 60 :shrug: ok and i found out today that even if i start it up and shut it off lettng it run as short as a minute and try to restart no pressure... if i let it sit for 30 seconds it starts:shrug: man im freakin lost ill keep going back to a fuel pump on the shyts...
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post #10 of 33 (permalink) Old 05-13-2006, 11:04 PM
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I'm not sure... thats a tough one...

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