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96 jimmy starts running ruff at a half a tank what could cause that

Does fuel pump have a double pick up and does it have a metal tank

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Maybe your tank is really empty when the gauge is showing 1/2 1996 model should have plastic tank . And has one pick up . Pump strainer is located on the bottom of the tank . Pump pulls fuel right from bottom of the tank .

Posted on Dec 28, 2016

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1 Answer

What cause fuel system to loose pressure new fuel pump installed also new filter & relay pump cranks 65 psi a run until pressure drops and quits, it might start, fuel pressure regulator ?


if it cranks at 65 psi the problem will not be in the regulator as the pump is producing enough fuel to exceed what the injectors need
What is happening is that the pump is not capable of delivering enough fuel to maintain that pressure when running so look for venting problems , hoses collapsing internally or blockage in the tank pick up

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Is there a possible pin hole in the line that would cause it to suck air? when you fill it past the pin hole it picks up the fuel, just a thot.

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Gas leak from top of the fuel tank in my 96 dodge ram 1500 v8 5.9 pick up


On the top of the fuel pump there is a rubber stopper covering an overflow tube
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Making my gas dump out. Dodge house did not have one in stock and had
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Apr 15, 2012 | 1996 Dodge Ram 1500 Club Cab

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I have a 2000 gmc sonoma when the gas gets below a half tank its hard to start it will also die while ur driving it and it backfires when you try to start it but only when it gets below a half tank


There is a metal chamber that is in the fuel pick up line about 1/2 way up designed to take the pulsation out of the pump.If the o rings are bad or the pump has been changed (some mechanics take the pulsator out and replace it with fuel line but if they didn't use fuel injection line it will only last like a few months.)
Either way sounds like the tank has to come out.

Mar 05, 2012 | 2000 GMC Sonoma Extended Cab

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Engine turns over but wont start. 1997 gmc jimmy


Fuel Pump or starter. Since you say it's turning over but won't start I'd say it's your fuel pump. You'll probably have to drop your gas tank to fix this problem as your fuel pump is in the tank. You might be able to just loosen the straps and lower your tank a little to access it without removing the whole tank. Check around to local junk yards for this part and you'll probably find it for half the price as new. Make sure you can get your money back if the used pump doesn't work before you pay for it though. Don't forget to run fuel system cleaner (2 bottles to a full tank) once a month.

Oct 15, 2011 | 1997 GMC Jimmy

1 Answer

O have a 96 Jimmy starts if u poor gas down it but will only run half throttle give it more and it cuts out change fuel filter what else could it be please help me


Check your fuel pump. Take the gas cap off, have someone turn the key to "run", and listen. You should hear the fuel pump humming for a few seconds, and then stop. If you don't hear a humming, you will likely need to change the fuel pump.
New ones are a ridiculous price for that truck. Try an auto wrecker. Let me know how you make out.

Jun 02, 2011 | 1996 GMC Jimmy

1 Answer

When my 1996 Jimmy gets to a half a tank the gas gauge goes crazy and will go to empty then back to half. I acts like it is running out of gas. It also has a rough idle. What could be causing this...


The wire harness to the fuel pump sending unit may be going bad which is common to happen. The harness is around $15.00 and it runs from the frame to the top of the gas tank. The other thing to is the fuel pump sending unit may be going bad and the float in side that measures the amount of gas, has gone bad and the unit may need to be replaced. As for the rough idle, it cold be related to the fuel pump starting to go bad and the fuel pressure is just marginal to keeping the engine running. The fuel pressure during cold start should be 62-65 PSI and should drop about 5 PSI when the engine is running. The other thing to that would casue a rough idle, would be time for a tune up, "spark plugs, wires and distributor cap and rotor, fuel filter"

Feb 08, 2010 | 1996 GMC Jimmy

2 Answers

Runs ruff at idle and when excellerating is missing


yep change the pump! and new filter too!!!

Jan 13, 2010 | GMC Jimmy Cars & Trucks

3 Answers

99 gmc jimmy, been running okay till a few days ago. Drove it to eat, came back out and it won't start. Battery okay. Tries to turn over, but won't. Acts like out of gas, but half a tank.


Listen for the fuel pump prime cycle.
Have someone listen back by the gas tank....turn the key after it has been off for at least 10 seconds to run position....you should hear a WHIRRRR for about a second or 2.
If it is silent....you may need a fuel pump.
Next give it a shot of starter fluid...if it starts on that...you indeed have a fuel problem.No start....no spark.
If no start and you did hear a pump cycle....then it's most likely a no spark problem.......a common cause is the crank sensor and/or ignition module.

Sep 09, 2009 | 1999 GMC Jimmy

2 Answers

1999 gmc jimmy will not start after it sits for a couple hours. have to spray starting fluid in injector will start fine after it has warmed up. it has a new fuel pump and filters and it is not missing out...


where did you get the pump replaced?a dealer or local garage There are 2 pumps for the jimmy one for a plastis tank which is an 18 gal and one for a metal tank which is a 19 gal.if the jimmy has a metal tank get the 19 gal pump . i ran into the same problem with my 98 jimmy

Apr 16, 2009 | 1999 GMC Jimmy

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