Has gas but wont start after 8 hours??? - Pirate4x4.Com : 4x4 and Off-Road Forum

25tkempker · 01-04-2010, 07:05 PM

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?

Bo185 · 01-04-2010, 07:16 PM

Quote:

Originally Posted by 25tkempker

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.

HAPPYJOHN · 01-04-2010, 08:25 PM

Is your gauge accurate? could be the sending unit isn't dropping
all the way down, and the fuel leakdown leaves the sump dry.

TireFryerSS · 01-04-2010, 11:07 PM

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.

25tkempker · 01-05-2010, 12:51 PM

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?

01-04-2010, 07:05 PM	#1 (permalink)
25tkempker Registered User Join Date: Jun 2007 Member # 93256 Posts: 44	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?

01-05-2010, 12:51 PM	#5 (permalink)
25tkempker Registered User Join Date: Jun 2007 Member # 93256 Posts: 44	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 12:59 PM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-04-2010, 11:07 PM	#4 (permalink)
TireFryerSS Registered User Join Date: Jun 2006 Member # 74407 Location: TEXAS Posts: 622	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.