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GMC Jimmy Fuel System

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

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#30 of 93 Re: fuel pump regulator question on 91-93 Jimmy [chrissanders] by repairdog Apr 25, 2007 (3:11 am)
Replying to: chrissanders (Apr 24, 2007 8:56 pm) Look both years up on the online auto sites and see if the same. I would go new as its the labor thats the pain.
#31 of 93 99 Jimmy fuel problem by aaron13 May 18, 2007 (9:51 pm)
Can someone give me some advise on my v6 4.3 Jimmy? my truck will run for a while about 10 or 12 miles I will stop the engine for a few minutes and try to start it again and will not start. Pump will not have electrical power (no noise on the pump). after a few minutes the truck will start again and can hear the pump running again. I have put a new gasoline pump, a new gas filter, a new fuel pump Relay. What else can I try? any sensors any where? Replies to this message: jim102 (Jun 06, 2007 7:56 am) repairdog (Jun 07, 2007 6:09 am) jim102 (Jun 10, 2007 4:51 pm) jbodden6977 (Jun 09, 2007 11:08 am) repairdog (Jun 10, 2007 3:58 am) jbodden6977 (Jun 10, 2007 8:43 pm)
#32 of 93 Re: 99 Jimmy fuel problem [aaron13] by jim102 Jun 06, 2007 (7:56 am)
Replying to: aaron13 (May 18, 2007 9:51 pm) Hi, Just wondering if you have figured out what the problem is with your Jimmy. I have been having similar problems with mine for the past year and a half. Replaced the fuel pump, and wires. It will sometimes start, sometimes not. There has already been a hole cut in the back of truck so top of pump is exposed where previous owner obviously had problems. I can open the back tap on pump a few times and usually it will start. Sometimes the pump will shut off when I am just driving down the road. I can't seem to find any explanation for why it is just shutting off. Any advice? Replies to this message: repairdog (Jun 07, 2007 6:09 am) jim102 (Jun 10, 2007 4:51 pm)
#33 of 93 Re: 99 Jimmy fuel problem [jim102] by repairdog Jun 07, 2007 (6:09 am)
Replying to: jim102 (Jun 06, 2007 7:56 am) Airtex makes a replacement connector for the top of the pump that may solve that. Must also have a good ground. Hope the pump put in was a Delco cause many others fail in a year so do a pressure test key on engine off and then running. Min of 60 psi KOEO and then 54 or so running. Replies to this message: jim102 (Jun 10, 2007 4:51 pm)
#35 of 93 Re: 99 Jimmy fuel problem [aaron13] by jbodden6977 Jun 09, 2007 (11:08 am)
Replying to: aaron13 (May 18, 2007 9:51 pm) my best considered advice - there are two ways to go on this. 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. Replies to this message: repairdog (Jun 10, 2007 3:58 am) jbodden6977 (Jun 10, 2007 8:43 pm)
#36 of 93 Re: 99 Jimmy fuel problem [jbodden6977] by repairdog Jun 10, 2007 (3:58 am)
Replying to: jbodden6977 (Jun 09, 2007 11:08 am) The problem with this is the pump and fual gauge are one unit. A new Delco pump and Airtex connector on top fixes most and with all newer vehicles the pump is cooled by the fuel so running down to empty all the time promotes earlier failure by overheating - thats just the facts.   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. Replies to this message: jbodden6977 (Jun 10, 2007 8:43 pm)
#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.

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