Reply To: Big Twin Fuel Pump Conversion

[frankr]

That was my intent as I posted the pictures. Fuel pumps are driven by alternating pressure / vacuum pulses. There are alternating pressure / vacuum pulses in the engine’s crankcase as the piston moves up and down in the cylinder. So the goal is to access those pressure / vacuum pulses. Drilling & tapping a transfer (bypass) cover for a hose fitting is a super easy way to do that without messing anything up. Remove one of the covers and take a look and you will see what goes on in there. Of course, you should remove it anyway for the drilling operation to keep chips out of the engine.