Quote:
Originally Posted by leegreen
What does that line connect to at supercharger end?
Although a fuel pump might draw a slight vacuum against suction from the tank, you said you had an electric pump between tank and mechanical pump so you should never see a vacuum. This line can only deliver fuel pressure to supercharger. For the engine to run the fuel pressure has to be greater than the intake pressure and in your case the pressure at the pump has to be greater than the regulated fuel pressure. I can't see what this line you found accomplishes. It may have been a misguided attempt to regulate or increase fuel pressure with bled off boost pressure?
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The port that the tube attaches to on the supercharger is a very small hole (may 1/8 of an inch) in the output of the supercharger to the carb plenum.
I mistakenly believed that the mechanical pump was in some way providing vacuum to the supercharger, when in fact I think the supercharger was bleeding off pressurized air via that port, but I'm confused as to why the former (deceased) owner would have directed it to the mechanical pump housing.