ORIGINAL: JohnBuckner
The VP20 osillating pump is the pump that relies on torsional vibration in the plane of rotation. The VP30 that the OP is talking about is the regulating pump that requires a crankcase tap to power a diaphram.
Jorgen turning the engine over by hand I beleve will not be sufficient for the pump to do its job.
John
yeah you right, i dont know whow to check is regulating the fuel flow, but, you turn the propeller at hand and it's start to draw fuel very quickly after the 2nd or 3erd turn, very nice whow it's work, i didnt think that it could have the enought strenght to deliver the fuel at that increible ratio.