Don't use the fitting on the valve cover or the crankcase pressure can't vent and that will definately force oil to the pump not to mention possibly blow out crank seals, pto gasket ect... The crankcase pressure HAS to vent... The best spot is in the intake manifold. If you removed the fuel tank you can tap the hole the govenor went through in the top of the block...If you use crankcase pressure to run the pump make sure the pump is higher than the fitting so any oil can run back to the engine..