Where is your check valve located? From what I have heard and read, the check valve should be as close to the nozzle as possible since the tank and pump are higher than the nozzle. When the car is shut off, all of the liquid between the nozzle and the valve will drain into the intake piping. Apparently replacing the valve with a solenoid type will get rid of that problem. My kit is still on the way, so I don't know for sure, but that is what I have found the past few weeks of reading.
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