So for a while my Yukon won't start if the fuel tank gets below a quarer of a ank, now it seems to just die for no reason. It seems o happen more ofen when rpms hi 3000. It will restart immediatlely. I suspect the fuel pump, but wanted some other ideas.
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Spray starting fluid into the air intake of the engine, it will start, if it dies out then you have burned out the electric fuel pump located inside the fuel tank, the reason is that when you run out of fuel the pump overheats and the shaft seizes up. You should never let the fuel level go below 1/8 tank on the gauge, the pump is cooled and lubricated by the gasoline it sits in, no fuel no cooling or lubrication.
Either your fuel pump has died, make sure you check all fuses and wiring for shorts, or the screen on the pump is clogged and needs to be cleaned. Most likely the pump needs replaced and the t ank will have to be lowered to acces the pump.
If you hit the tank and it ran? The fuel pump is bad. By striking the tank you jarred the pump, causing what mechanics call "The last ride" Peice of sound advise, Replace with ac delco pump. The zone pumps go out usaly within months if not days
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.