Hello All,

I can't seem to find what the 3 hose connectors are on the ls1 pump assmebly. 1 will be the feed but what are the other 2? I thought it was returnless?

I am looking to possibly use the ractronics adapter to put an ls1 pump assembly in my 71 Ventura turbo ls swap.

Thank you Bil

 

1 is pressure, 1 is return from the fuel filter, 1 is purge. The truth is GM calls it returnless but all that means is NO RETURN FROM THE FUEL RAIL. It is a return system but the return is after the fuel filter but before the feed line up to the engine. Confusing I know. After the fuel filter is a TEE, that tee feeds the line going forward and the return line going back into the fuel pump assembly where the fuel pressure regulator controls the fuel pressure. So the pressure is the line going forward is controlled by the return line going to the pres regulator in the pump assembly.