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SUVs GMC Jimmy GMC Jimmy Fuel System
93 messages, Last post on Aug 17, 2009 at 8:23 AM
You are in the GMC Jimmy Forum. Your Hosts are steve_ & tidester
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Replying to: aaron13 (May 18, 2007 9:51 pm) A new stock fuel pump is not one of them. After much experimentation and diagnosis I believe the fuel pressure regulator is at fault - somehow it is tellin the fuel pump that there is 60 pounds of fuel in the line so the fuel pump does not need to run!!! A political simile, the CIA report on WMD in Iraq... I believe the item responsible is inside the throttle body on top of the engine - or maybe Saddam has it so well hidden we can't really prove it exists? Ha ha ha... If the vehicle was mine, after installing a new pump and it repeating the same symptoms after four days of running, I would put in a new pickup line (fuel from the tank) eliminating the stock fuel pump, install an inline external fuel pump (on the inside of the frame) with a fuel filter before AND after the fuel pump - (due to the way the fuel filters are a part of the fuel line design on some vehicles removing the second fuel filter is both bothersome and really beside the point). The pumps such as available on Ebay are about $129, hit up to 120 psi - and are more accessible than dropping the fuel tank every darn time... just my two copper plated zinc pennies worth. Good luck. I am sticking with my 73 Dodge van.
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Replying to: jbodden6977 (Jun 09, 2007 11:08 am) The pressure regulator is part of the injection assembly located under the upper intake manifold plastic cover and under that big electrical connector behind the throttle body.
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Replying to: repairdog (Jun 07, 2007 6:09 am) |
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Replying to: repairdog (Jun 10, 2007 3:58 am) 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. 
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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. 
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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. |
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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.
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Replying to: mtlwiz (Jun 26, 2007 10:11 am) |
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| 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. | |
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