03 opti 225 sn ot701189
I been plagued with fuel starvation issues all season. Has led me to learn a lot and replace a lot of components in the fuel system. I previously found I had a broken reed on the #2 cylinder and seeing how the case pressure from that cyclinder helps drive the lifter fuel pump I thought I had the problem solved for sure.
Well the mech fuel pump(recently rebuilt) still won’t pull any vacuum. Actually if I pull the supply line off while the engine Is running a little fuel and air spritz out of the pump in port like it’s actually pressurizing the supply.. The gauge I used to test the system stays around zero even when the supply line is pinched inches before the pump and I run the motor up to 2000 rpm. I can never feel a vacuum on the inlet port.
The crankcase is pulsing strong so it’s not a reed. (Comp check is good) The pump is assembled correctly. I have cleaned the vst(and needle) and it all all seems fine.
Any ideas before i buy an entire new mechanical pump? I don’t see any housing cracks and the checkvlavess and diaphragm seem fine but something is not working correctly.
Btw. The issue is only at coming off idle after sitting. I can cruise all day long. If I shut it off for 20 minutes, idle for a min, and then try to hit it... there’s no fuel. Pump the ball tight , and off I go.
Any insight is greatly appreciated