The GM HEI modules are either 4 pin or 7 pin, since this is carbed, I'd assume it's a 4-pin. Don't assume the impco stuff is faulty.Īs for spark, check it like you would any vehicle, verify with an extra spark plug connected to one of the leads, you should get a hot blue kernel. The propane cools the vaporizer, so to get a continuous vapor out it needs the coolant, but with just starting up the ambient temp is enough to vaporize some propane. The primer button on the vaporizer is there to jump some vaporized propane before the coolant kicks in to vaporize the propane. ![]() Take the big hose off and the vacuum line, connect a vacuum pump (brake bleeder type) to the vacuum line and see if you get propane. The big hose has to be connected to get vacuum IIRC. The Impco system only has around 8-9in vacuum at the fuel cutoff.
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