[hatzie]

Originally Posted by Ford Assassin

Digging up an old thread....





Any reason this wouldn't work on my TBI/454 1988 R30 for my 5.3 swap? I have done well over 25+ LS swaps, but never had to deal with two tanks.

Here's the paper napkin plan:

Each in-tank TBI pump (both new Delco pumps 7 months ago), through the factory fuel lines to the stock tank switch valve, then valve would feed into the high pressure pump (Walbro 255 in-line that I already own, just need to splice in), then into a
Wix 33737 Corvette style filter/regulator (and fuel return plumbed back into the factory/stock fuel lines, through the switch valve), lastly to the 2005 returnless the fuel rail inlet.

This would be the least expensive route for me since I already own everything from a previous project combined with the factory TBI fuel system. Easiest too from a labor stand point.

Newer diesel trucks and gasoline sedans do it that way. Lift pump then the system pressure pump.
Lift pumps in the tanks that can supply enough volume to keep the single high pressure pump mounted outside the tanks happy.
As I said in the dual tanks post... the return pressure shouldn't damage a 65PSI Pollack valve. I did neglect to mention that you'll probably have to update the valve to the latest and greatest from Pollack. The original GM valve is not rated for 65PSI more like 35 or 40PSI.