[John]

Then you have reached the end of my limited brain power because by mounting low I would not think fuel would drain from the Racor to a level lower than that of the fuel tank. What you suggest says the Racor is mounted way lower than what would likely be your fuel level.

The only thing I would think would cause fuel to come back out of the Racor or other fuel filters would be if your fuel tanks vent(s0 were plugged and you had a vacuum in the system sucking fuek back into the tank. You don’t hear a hiss when you open the fuel cap do you?