2003 yukon when under 1/2 tank and sits over night on slight incline, wont start until i roll it down level or add gas.
I HAVE THIS EXACT PROBLEM. If you got this repaired, what was the fix??
OK I HAVE THE ANSWER. The fuel pump needs to have an adequate gas supply to start up. When low, or on a steep angle, and especially when BOTH conditions occur, the pump is no longer submerged. A check valve is intended to retain gas at the pump in that case, but over time it leaks. So actually, there are THREE things that must happen -- park on a hill, be low on gas, and leave it there for a long time. The fuel drains out, and no worky. The check valve cannot be easily replaced by itself - it comes wiht the pump as an assembly. Two fixes -- if the check valve is old enough to leak, the pump is old too. Replace them both. Or, just avoid the problem -- the pump could have years left. I had my pump checked, and it does appear to have years left, so now that I know the problem, it hasn't happened again. THIS IS THE CORRECT ANSWER.
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SOURCE: 2002 jimmy sls 4x4 wont start parked it 12hr later wont start
check fuel pump and make sure you have enough gas in it also
SOURCE: If I have less than 1/4 tank of gas my yukon won't start.
I had the same problem. I had a few different mechanics tell me that the fuel pump is starting to go out when it does that. The fuel pump is located in the fuel tank, and the gasoline keeps the pump cool and lubricated. When the fuel tank is less than a 1/4 full, the pump is not submerged anymore, and can have trouble sending gas to the engine. My emergency fix was to get underneath the car on the driver's side and bang on the gas tank about three times. It will start up, and will run great unless you turn your engine off. But eventually you're going to need a new fuel pump. Once I replaced it, the problem went away.
SOURCE: 04 GMC Yukon won't start on less than 1/4 tank of gas
have your evaporative emission control system check.sound like you have purge valve solenoid not working or vent valve control solenoid.have it scan.to see which component not working..reason your gas tank expanding. your fuel vapor building up pressure.your purge valve and vent valve open allowing gas vapor from charcoil canister. to be burn in the intake manifold to be burn in combustion chamber.
SOURCE: 2004 GMC Yukon won't start if less than 1/4 tank of gas
sending unit for gas gauge is not correct
SOURCE: Gmc yukon stuck in park.
possible brake switch not sending signal to shifter solenoid to allow shifter movement. possible broken shifter knob/relay rod in shifter assembly
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