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GMC Jimmy Fuel System

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

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#37 of 93 Re: 99 Jimmy fuel problem [repairdog] by jim102 Jun 10, 2007 (4:51 pm)
Replying to: repairdog (Jun 07, 2007 6:09 am) Thanks for the advice! No, the pump was not a Delco, I thought I would take the cheap way out and had ordered one off of the internet for half the price of any of the parts places here. Guess you get what you pay for. I will try the replacement connector and check ground, but probably just end up replacing pump with a Delco.
#38 of 93 Re: 99 Jimmy fuel problem [repairdog] by jbodden6977 Jun 10, 2007 (8:43 pm)
Replying to: repairdog (Jun 10, 2007 3:58 am) I have disassembled a stock fuel pump. You can remove ONLY the pump/motor and simply extend the tube that leads to the output nipple so that it picks up fuel from the bottom of the tank (with a screen of course.) then just replace the plastic pump casing/housing thingie WITH the fuel level sender still intact and in place. If you look closely you will find that the pump housing is a two piece snap together assembly. Easily separated to access the pump unit.
#39 of 93 worn out in four days? dont think so... by jbodden6977 Jun 10, 2007 (8:49 pm)
I did replace the pump with a new pump. The tank had a full load of fuel for the four days before the fuel pump started the exact symptoms of the 'bad' pump we replaced. Pardon my impatience, but I am only too aware of the design defect of this modern moronic piece of so called engineering that is designed to fail due to a 'too empty fuel tank'. this kind of engineering is proof that cousins should never marry - their mothers. Somehow I seriously doubt that I, and all the many many others with the same results, managed to 'wear out' a new fuel pump in four days.
#40 of 93 Fuel Pump Problems-GM by jim102 Jun 12, 2007 (2:36 pm)
Maybe a helpful article for anyone with GM vehicle from 1988-2005 fuel pump problems.   www.airtex.com   Many GM vehicles from 1988-2005 have electrical connectors on the fuel pump module that may become loose over time due to vibration, leading to faulty, high-resistance connections. The symptoms- burned or melted connectors and pins- lead to a voltage drop situation where low or no voltage can cause the module to stop pumping. Solution: Airtex products latest fuel system solution provides a quick and reliable fix for burned or melted wiring harness connections on certain GM in-tank fuel pump applications. Airtex has replaced the faulty OEM design that eliminates the burned or melted connectors and pins problem.
#42 of 93 99 jimmy fuel pump by mtlwiz Jun 26, 2007 (10:11 am)
i know it's probably been beaten to death, but when a fuel pump is going,can it only show up at start up as if it'll run rough untils it seems as if once a few degrees of heat gets in the cylinders then it'll straighten out and run fine? no codes,100,000 miles new pump about 10,000 ago but is progressivly gett more noticeable,almost as if it takes time for fuel system to biuld pressure as its started to drive away then will accelerate normally. Replies to this message: repairdog (Jun 27, 2007 2:02 pm)
#43 of 93 Re: 99 jimmy fuel pump [mtlwiz] by repairdog Jun 27, 2007 (2:02 pm)
Replying to: mtlwiz (Jun 26, 2007 10:11 am) Have to test the pressure at the port on the fuel rail to know. Rough could be many things as dirty MAF snesor, fuel filter, air filter, air idle control valve, etc.
#44 of 93 Gas tank valves on 95 GMC Jimmy by atapia Nov 24, 2007 (6:24 pm)
I have a 95 GMC Jimmy 4dr.2wd. I recently replaced the fuel pump, and noticed two valves on top of the gas tank. One of which had a small crack on the neck of tube which leads to what seems a vaccum or a canister of some type. Tried to purchase one at typical auto parts store and they didn't have it and didn't know what exaclty it was for. Do I have to dealer to get one, do I really need it? Can someone help me with this problem.
#45 of 93 missfire by mhildreth Nov 26, 2007 (6:50 pm)
have 94 jimmy problem misses at idle, backfire when revved up replaced timing chain and gears ,ign module,plugs,wires cap and rotor yes timing gears are set correctly has new fuel pump filter by prev owner oh yes also new coil jimmy has 174000 mi have run fuel inj cleaner in it the engine will rev with a lot of patience but has no power did check with timing light ok
#46 of 93 94 jimmy missing ! by mhildreth Dec 11, 2007 (5:02 pm)
After replacing and testing alot of items . I finally replaced the fuel injector . Very expensive but fixed the problem. There is only one test to see if its working no way to check the nozzles. To see if they are clogged. Only a few minor bugs to work out so good luck out there. Got to luv bowties!

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