About a year ago I wouldn't start and it turned out to be the Impco VFF30 fuel lockoff wasn't letting the fuel get to the mixer (or is it called the vaporizer ?) and then to the carb (carb is Impco CA100-334-1, engine is 2003 GM Vortec 6)
I took the VFF30 apart and fixed it, but a year later exact same symptom.... ran perfect when I first started it up and then died 30 seconds later and won't even think about starting (with fully charged battery and starter working perfectly) ever since.
So this time I figure I'd better just buy a whole new VFF30, so I do, install it and the damn thing still won't even think about starting.
Big question is....the big hose that goes from mixer direct to carb inlet...if I remove that while turning the engine over....shouldn't there be LP gas coming out ? (there isn't) And is the smallest hose the vaccum that operates the VFF30 ? If so, and I remove that hose, shouldn't I be able to feel vacuum at the carb outlet for that hose ? (I can't...but then the hole is so small... )
BTW, there is definitely plenty of LP getting to the VFF30...no problem with tank connection or hose.
My guess so far...something wrong with mixer or no vacuum from carb....what say ye ?
(also, what is the spring loaded button in the center the mixer ? And yes, pressed that...doesn't help)
I took the VFF30 apart and fixed it, but a year later exact same symptom.... ran perfect when I first started it up and then died 30 seconds later and won't even think about starting (with fully charged battery and starter working perfectly) ever since.
So this time I figure I'd better just buy a whole new VFF30, so I do, install it and the damn thing still won't even think about starting.
Big question is....the big hose that goes from mixer direct to carb inlet...if I remove that while turning the engine over....shouldn't there be LP gas coming out ? (there isn't) And is the smallest hose the vaccum that operates the VFF30 ? If so, and I remove that hose, shouldn't I be able to feel vacuum at the carb outlet for that hose ? (I can't...but then the hole is so small... )
BTW, there is definitely plenty of LP getting to the VFF30...no problem with tank connection or hose.
My guess so far...something wrong with mixer or no vacuum from carb....what say ye ?
(also, what is the spring loaded button in the center the mixer ? And yes, pressed that...doesn't help)