Question about 2003 GMC Yukon Denali

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My daughter has a 2003 Yukon Denali XL and the fuel pump, and fuel filter were just replaced, but now the truck starts but doesn't stay started and runs really rough. You have to 2 foot drive it to keep it started. What could it be?

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Check the idle speed sensor, also check the fuel pressure at the engine, make sure is at spec

Posted on Jul 30, 2009

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If the fuel pump is running check the fuse for the injectors if the fuse is good check the air filter to be sure it is not too restrictive if that is good check to see if the fuel filter is put on so that the arrow on the filter is towards the engine.you also might look at the spark plugs to see that they arent fouled out and they arc properly. check the coils to see if all of them get a spark. if the fuel pump is not running check fuse or that the pump is connected properly. if the pump isnt running the engine will just run off of the fuel already in the line until it is gone causing it to stall out

Posted on Jul 30, 2009

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1 Answer

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When engine is cold vaporization of gasoline is minimum. When fuel vapor is less than required and the fuel mixture is not ideal, ignition happens harder than it does under ideal running conditions of engine. When fuel pups is sweak, or filter is limiting, or fuel injectors are not injecting gasoline with improper pattern inside engine, or just becasue of corroded spark plugs, cold engine faces difficulties during first ignition.

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Doesn't completely sound like a fuel pump problem...sounds like a vacuum line problem .... check your pcv ...and vacuum lines and when was your fuel filter last changed and how many miles are on the car...your fuel pressure regulator solenoid needs to be dry on the vacuum side too...diaphram could be leaking but if you can't find an obvious problem I would definiately find a qualified mechanic to dive into it...do you have access to a scan tool to read the trouble codes?

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Were can I buy a fuel pump for 2003 yukon xl denali


Hi, you can get the fuel pump to you 2003 Yukon XL Denali from Auto Parts Warehose for $166.16 with free shipping within the U.S.A. Contact them on 1-877-809-1467...

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It's quite possible the fuel pump burned up when you ran out of fuel. When you turn the key to the on position can you hear the pump activate and send the fuel to the injectors for initial start?

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2003 gmc yukon denali xl


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