I have a yale with a mazda engine in it. I have never messed with the spectrum fuel system in the past. I have no idea how much fuel pressure I am suposed to have coming out of the regulator to the throttle body assembly. Is it the same as the old Impco systems. I dont hear nor see LP leaking from the fuel system but smell it as soon as you turn the lift on. When i remove the vapor hose from the throttle body it has pressure behind it and i do not know if this is correct.
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