Fueling & Injection - Do stock fuel systems on ls1's have a return line???

I'm only asking because as per an MSD tech on the MSD forums their BAP cannot be used on returnless fuel systems or pulsed type fuel pump systems...Sorry for the dumb question but I wasn't really sure.. Any help greatly appreciated. Thanks Andy :devil:

They don't have a return line all the way up to the fuel rail. I know that MSD states that they can't be used on a returnless system, but everyone does, and it works. We do this all the time on all the late model GM cars, as does many other companies.Bob

Pulse system is different then the LS1 system. It uses the computer to control the length of time the pump is on and off. Where your system uses a regulator in the tank to control the pressure.

Nate

The return line comes from a T near the output of the fuel filter.

Thanks for the the replys guys I really didn't know. I guess I will have to probably go with a dual pump setup since mine doesn't seem to be working for me.

My understanding is that early LS1 f-bodies do have a return line - 98's and early 99's(mine was built 11/23/1998 and it has one) - no regulator in fuel tanks on these

Yours is the same the no F-body had a return system. Only LS1 cars to actually have return lines were 97-98 Vettes and 99-02? Trucks

Nate

My understanding is that early LS1 f-bodies do have a return line - 98's and early 99's(mine was built 11/23/1998 and it has one) - no regulator in fuel tanks on these

The 04 05 cobra guys are using these, im almost certain those are returnless systems.