1973-1991 Dual fuel tank systems theory of operation

[Ford Assassin]

Originally Posted by hatzie

As long as you aren't exceeding the pressure capacity of the valve I don't see a problem with it.
Use high volume low pressure lift pumps in the tanks to feed one frame mounted high pressure pump.
The lift pumps will keep the high pressure pump from starving and the return pressure should be low enough that the 65PSI valve will handle it.
Several Japanese and European cars are designed that way.

I appreciate the timely response.

The inlet pressure for the valve will be stock TBI pressure, no worries there. The return pressure might be higher, but unlikely since the return should be free flow returning to the selected tank.

I figured this would work, many diesels operate this way, low pressure, high volume lift pump supply to the injector pump.