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GMC Jimmy Fuel System

93 messages,  Last post on Aug 17, 2009 at 8:23 AM

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#47 of 93 Re: 1994 S-10 Blazer getting no power to the fuel pump [pwardon] by mhildreth Dec 11, 2007 (5:14 pm)
Replying to: pwardon (Dec 26, 2006 11:59 am) Have you tried hot wire to fuel pump to see if it works could be bad connection at pump also ground , the relay could have corroded connections. With key on check for power at relay. Have noticed with these vehicles that most of conectios have corossion problems even inside the dash.
#48 of 93 won,t start by jerry57 Jan 22, 2008 (1:32 pm)
at the fuel pump at the tank unhook the wires and when i tested for voltage. one had voltage all the time i assume this is the gas gauge. because it was low voltage.then you will have two that is the ground. then the other one don,t have voltage on it with just the switch turned on. but as soon as you turn the switch on over as to start it it has voltage is this the way it is suppose to work
#49 of 93 97 GMC Jimmy fuel pump relay by mom23boys Apr 09, 2008 (5:32 am)
Can anyone tell me where the fuel pump relay is located on my 97 GMC Jimmy 2WD??? I have tried my Chilton's book - the Chevy House--Autozone!! I need Help! THANK YOU Replies to this message: ms71171 (Jun 04, 2008 2:19 pm) wgrace (Aug 02, 2008 6:55 pm) ms71171 (Aug 03, 2008 8:05 am)
#50 of 93 Jumping in here with my 96 GMC Jimmy Fuel Pump Issues by ms71171 Jun 04, 2008 (2:19 pm)
Replying to: mom23boys (Apr 09, 2008 5:32 am) Ok, bought a 96 GMC Jimmy 2 door for my daughter's first vehicle - Good looking truck, 190K, 4.3   After 1 month the fuel pump failed - no big deal, done this before with the in tank fuel pump on my 99 suburban. Replaced with a Airtex fuel pump from Oreilly Auto Parts and all was good.... For 5 days - broke down again.   Checked the fuel pressure at the fuel rail and fuel squirted everywhere, so I THOUGHT I had fuel pressure... and the truck would run with starting fluid - SOOOO I went down the route of replacing the Fuel Injector Assemby (Spider). This did not fix it. Luckily, I bought a used working one on ebay for $40.   Finally bought a fuel pressure gauge (hind-sight 20/20) and realized I had 12 psi.   Replaced the Fuel Pump with a new one from Oreilly no questions asked.   Getting very good at this at this point - Thought I was good to go - Bad pump I thought.   Week later, after pumping gas, the truck would not start again.   Fuel pump wiring harness? Don't think so since the Airtex came with a new one Clogged Fuel filter? will check, but doubt it. Already replaced on the first swap. Cough up the money for the AC Delco? Thinking this may be the fix. Hitting the truck to free up a stuck pump? Will try this tonight to see if it starts. Blowing out the fuel lines? Need to do this   Here's my conclusions, based on everything I've gone through.   1. Check fuel pressure - Buy the $50 high pressure gauge kit - worth it! Just because you hear it whinning does not mean anything - You need at least 56 psi. 2. Be ultra careful with the plastic fuel connectors on the lines/pump 3. Be sure to keep your little fuel line plastic clippy things if you're returning your pump   I'll update tomorrow after I troubleshoot this second failed fuel pump. Replies to this message: wgrace (Aug 02, 2008 6:55 pm) ms71171 (Aug 03, 2008 8:05 am)
#51 of 93 Re: 90 Jimmy fuel Promblen [gator14] by etubbs Jul 09, 2008 (4:31 pm)
Replying to: gator14 (Sep 27, 2006 3:21 pm) i got 97 jimmy its on back the motor close to the dashright down ull see it sticken out of the motor right under the distributer thats where mine is ..........ed
#52 of 93 what I found wrong w/my 2001 GMC Jimmy fuel pump problem by wgrace Aug 02, 2008 (6:55 pm)
Replying to: ms71171 (Jun 04, 2008 2:19 pm) My oldest daughter acquired a '01 Jimmy 2wd. Everything fine and dandy until it wouldn't start. She is 26 (and knows everything) and takes it back to dealer to fix. Dealer has new fuel pump and filter replaced and not too happy that he has to spend $600+ to keep her happy. One week later, same thing, wont start. She goes back to dealer to find that the dealer and his mechanic hasn't got a idea what to do. Now nobody is happy. She ask me for help, I hit the tank w/a big wrench, fired right up. Did the same thing several times over the course of a month, then it finally just wouldn't start at all. After month and a half as a yard ornament she asked if I would like to buy it cheap, big hearted me I said yes. Gave her the money and towed it home. Spent today trouble-shooting the fuel system and found the fuel pump ground wire loose(black wire w/white runner). As soon as I repaired the ground, it fired right up. If you don't see another post from me, then you'll know it worked. Oh, by the way, I've got 12 years w/ John Deere, Caterpillar, and big trucks.
#53 of 93 Re: Jumping in here with my 96 GMC Jimmy Fuel Pump Issues [ms71171] by ms71171 Aug 03, 2008 (8:05 am)
Replying to: ms71171 (Jun 04, 2008 2:19 pm) Just wanted to update everyone on what finally fixed my 96 Jimmy's fuel pump. I ended up replacing the fuel pump 3 times. 2 times with the Airtex brand from Oreilly Autp Parts, and the last with a OEM Delphi fuel pump. Using the OEM fuel pump is critical it seems on these Vortex motors which seem to be very sensitive to fuel pressure.   The second Airtex fuel pump never completely quit and would keep the truck running just fine if I started it with some fuel dumped in, but never made more than 50psi which is not enough to start the 4.3. It needs at least 54psi to start.   My advice would be to pay the extra $30-40 bucks for the OEM Delphi or AC Delco fuel pump. Don't waste your time on other brands - You only want to do it once, right?
#55 of 93 Fuel leak!!! by 97jimmy4dr Sep 15, 2008 (5:18 pm)
Just got the truck a week ago, has fuel leak(driver side) drips off of frame when engine is running,only when running. Anyone have any ideas what I should look for, before I go under to have a look???? Replies to this message: mwolf9000 (Sep 16, 2008 5:35 am) 340sport (Jan 01, 2009 4:17 pm)
#56 of 93 Re: Fuel leak!!! [97jimmy4dr] by mwolf9000 Sep 16, 2008 (5:35 am)
Replying to: 97jimmy4dr (Sep 15, 2008 5:18 pm) The fuel filter is located along the frame rail on the driver's side. You might check the fuel line connections to the fuel filter. Probably a good opportunity to just replace the filter anyway.

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