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Old 01-04-2010, 08:05 PM   #1 (permalink)
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Has gas but wont start after 8 hours???

My 03 gmc yukon won't start when low on gas and sits for over 8 hours. If it sits for a few hours it fires right up. When it doesn't start dump a few gallons in and it fires right up. Is this the fuel pump?
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Old 01-04-2010, 08:16 PM   #2 (permalink)
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Originally Posted by 25tkempker View Post
My 03 gmc yukon won't start when low on gas and sits for over 8 hours. If it sits for a few hours it fires right up. When it doesn't start dump a few gallons in and it fires right up. Is this the fuel pump?
Could be fuel pump on the way out. But change the fuel first filter.
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Old 01-04-2010, 09:25 PM   #3 (permalink)
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Is your gauge accurate? could be the sending unit isn't dropping
all the way down, and the fuel leakdown leaves the sump dry.
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Old 01-05-2010, 12:07 AM   #4 (permalink)
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Dont know how much searching you've done here or on Google but the answer is out there.

This is a common problem. There is a check ball in the sending unit that holds the fuel pressure after the engine is shut off. Over time these crack and the fuel pressure bleeds off.

Couple of steps to verify:

1. If after sitting for a long period of time (overnight), cycle the key about 3 times, 3-5 seconds on, then off, then on 3-5 seconds, etc. See if it it'll fire off.

2. Verify fuel pressure at fuel rail. After sitting for a long period of time, you should still have good pressure, and when the key is turned on, there should be approx. 55psi

Do this, report back.
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Old 01-05-2010, 01:51 PM   #5 (permalink)
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It just had a tune up, all filters and sensors replaced. I have checked the rail and the pressure is good. I'll have to try cycling the key(should it fire up?).

I have looked alittle but havent found much other then maybe a bad gas cap.

Does anyone know of a CHEAP fix?

Last edited by 25tkempker; 01-05-2010 at 01:59 PM.
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