200xs

[rock]

I have a manual and have rebuilt several Optis. There is a schrader valve on the fuel rail to check high pressure but no valve to check boost pump. I cut a factory line to install a valve in order to check low pressure pump. Low pressure pump should read 6-9 lbs and high pressure 95. I have zero at boost pump therefore no supply to high pressure pump. My confusion stemmed from the fact I have dealt with more EFI than DFI and did not know the high pressure pump did not draw from the vst like a normal EFI and only the boost pump. Should have been able to figure this out on my own but here we are.

Rock

[25two.stroke]

Yeah two separate galleries in the vst. Very stupid in my opinion how they have all that. You should not need 3 fuel pumps to make 95 psi...