Honda GX620 won't run; no pulse for fuel pump

[mcj115]

I have a Honda GX620 engine that I can't get to get running at anything more than an idle after I force the fuel system to be primed. . The problem is fuel starvation....the pump isn't pulling fuel from the tank to the carb. The engine has a impulse driven pump which is driven by a line in the valley of the two cylinders. The problem is not the fuel pump...I have tried a few spare fuel pumps I have laying around all with the same result. I have tired hooking up a vacuum/pressure gauge to the port with no readings while the engine runs (at low idle).

Does anyone know how the pulse/impulse on a Honda Gx620 is created? There is a larger vent/breather line (maybe 5/8th) that runs from the intake horn right in front of the carb to the valley right above the flywheel; I did check this and when running this line seemed to have a pulse/impulse, but not the smaller 1/4 line to the fuel pump. From the looks there is some type of breather valve where the vent line enters the block. I am at a loss...could the breather value be bad causing a lack of vacuum preventing the impulse for the fuel pump?
Any recommendations/ideas are appreciated

 

[mcj115]

Argh....I need to clock this one up to operator error! Sometime I don't think I should be left in the garage alone with tools.
Problem solved...I had the valve covers off. The crankcase could not; without the covers the crankcase wasn't sealed and couldn't generate a pressure differential. Popped the covers on and viola problem solved.

 

[Richard001]

Slap yourself around a bit, then you will feel better, then have a cool beer.