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GMC Jimmy Fuel System

88 messages,  Last post on Jul 02, 2009 at 5:22 AM

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#52 of 88 what I found wrong w/my 2001 GMC Jimmy fuel pump problem by wgrace Aug 02, 2008 (7:55 pm)
Replying to: ms71171 (Jun 04, 2008 3:19 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 88 Re: Jumping in here with my 96 GMC Jimmy Fuel Pump Issues [ms71171] by ms71171 Aug 03, 2008 (9:05 am)
Replying to: ms71171 (Jun 04, 2008 3:19 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 88 Fuel leak!!! by 97jimmy4dr Sep 15, 2008 (6:18 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 6:35 am) 340sport (Jan 01, 2009 5:17 pm)
#56 of 88 Re: Fuel leak!!! [97jimmy4dr] by mwolf9000 Sep 16, 2008 (6:35 am)
Replying to: 97jimmy4dr (Sep 15, 2008 6:18 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.
#57 of 88 by kschreiber49 Sep 21, 2008 (6:23 pm)
the fuel gauge hasn't worked since we replaced the fuel pump we disconnected the battery replaced the fuse re connected the battery fuel gauge went to full then empty then in the middle and stayed any ideas?? please help. Replies to this message: mwolf9000 (Sep 22, 2008 7:39 am)
#58 of 88 Re: [kschreiber49] by mwolf9000 Sep 22, 2008 (7:39 am)
Replying to: kschreiber49 (Sep 21, 2008 6:23 pm) No surprise the problem is with the fuel pump replacement (as opposed to being a problem in the dashboard). I'd tell the garage that replaced the fuel pump that the fuel guage isn't working now and see what they suggest.
#60 of 88 Fuel pump by snowdawg1 Sep 27, 2008 (4:10 pm)
Have 01 jimmy fuel pump is kicking off thought pump was bad I replaced it last night still having issues.Will start after battery is disconnected then reconnected but wont restart. Will a low battery cause this?What would? Replies to this message: tech1help (Oct 25, 2008 9:07 am)
#61 of 88 electrical problem by subrock86 Sep 28, 2008 (2:35 am)
ok, ill start with some backround information, have a 94 gmc jimmy with the vortec engine, have had the car for a while now and never had a problem with it until this point, recently the car quit on my brother while driving, towed to a garage and left the keys in the glovebox for repair, the next day they called me and said it ran fine, and they couldnt get it to not run......, so i picked it up, brought it home brother took it to work drove it home, few hours later i tried to start it and nothing it just turned over, bought a fuel pressure gauge and its running 60 psi turn key engine off, but just cranks and cranks and cranks, today i bought a new coil and installed, the car sat roughly 1 hour inbeetween starting attempts and installation of the new coil engine started i let it run roughly 20 seconds turned it off and tried again and back to the same old problem just turned over, as i installed the coil the only thing that changed was i was moving around the wires that run from the distributor cap to the coil, and or the power source, pulled a spark plug and had no spark, moved around the coil (wasnt bolted down yet) and got a spark but the engine still diddnt turn over i shocked my dad so i stopped trying lol, just wondering if anyone has a clue whats happening with my truck, im figuring its a short somewhere in the ignition, but dont know where to begin to look, i would appreciate any and all advice thanx guys Replies to this message: tech1help (Oct 25, 2008 9:13 am)

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