I have a 1987 300SDL. Sometimes when I park it overnight facing uphill. it seems like there's no fuel, and it won't start. I roll it backward and aim downhill. Then after some cranking, it comes to life (no smoking). Suspecting suction in the fuel tank, I drilled a small hole in the fuel cap (upon the advice of Mercedes mechanic). Problem still recurs, but only on a reasonably steep hill. Fuel is always visible in the fuel filter. Mechanic says maybe the fuel thermostat, which is upstream of the fuel pump. Expensive guessing game! Anyone had this happen?

dcalei