pipefitter

Oddly, I started it after it sat for 4 days with the front down hill. (about a 5-8 degree slope, according to my angle finder). It started, stumbled slightly, then smoothed out. Much, much better than with it uphill. So it seems like the fuel flows away from the engine with the front uphill.

oliver foster

That is a sure sign of air leaking into the fuel system.

The fuel is less prone to run back to the tank if the engine is down hill / below the fuel level in the fuel tank

pipefitter

That's about what I figured. I'll start at the engine and work my way back tightening fittings, looking for tell tale signs of a leak. It must be pretty small.

oliver foster

I have gone through this problem with several trucks.
I have heard of the O-ring in the factory clips on fuel connections being an issue. so check where it clips into the LP.

pipefitter

I will. I hope to knock it out by the weekend.