Right now I have an inline pump, and an in cab tank. I can smell gas fumes at times and the pump suffers from starvation on tight turns.

So I think I will be ordering a fuel cell from Fuel Cell Guy with the in-tank pump/pickup/sending unit.

I thought I read that an LS1 returnless pump can be used instead. Can this be done? What is needed to do it? Do I just plug up the return line? Does a diferent fuel pressure regulator need to be installed?

Thanks,

I thought I read that an LS1 returnless pump can be used instead.
Thanks,

I've never heard of a returnless pump. Someone please correct me if I am wrong.

Essentially, the way the GM TPI systems work is with the fuel pump flowing the fuel into the rails where a pressure regulator holds up the flow until sufficient pressure is available to allow the injectors to work correctly. Think of it as sticking your thumb on the end of a garden hose. When that pressure is attained, the regulator allows the excess fuel to return back to the tank. Hence, while the pump is pumping (actually the entire time the engine is running) fuel is flowing around in a circle and being used as necessary. The specific fuel pressure from the regulator is what allows the fuel to spray out of the injector, so it is absolutely critical that the proper pressure is flowing through the system (I believe 45 to 50 psi). In fact, most of the time when problems are encountered with a TPI engine, the first place to begin troubleshooting is to hook on a pressure guage to make sure sufficient fuel pressure is there.

That being said, there is no getting around that return line. You will have to plumb it. On the bright side, being that the whole system will have much more pressure than the stock fueling system, you would be stupid not to replumb the supply side as well.

But it is easy. -6 braided AN lines and fittings (Aeroquip, Earls, or Russell) are easy to do, and can be routed just about any way you want. Plus, you don't have to worry about vibrations causing a line to break and cause a fire.

As for pump, go with an in tank pump, generally from the F bodies, Corvettes, and later model trucks.

I have to agree.
Never seen a GM anything with an electric pump that didn't have a return line. The return line not only keeps the pressure from getting too high and damaging the pump and/or injectors, but it also keeps the fuel circulating and helps it stay cooler.

Thanks. Did a little digging around. Returnless system has a regulator closer or integrated into the pump. I'll be sticking with a conventional EFI pump so I'll have access to my AFPR.

image stolen from and more info at http://www.aa1car.com/library/returnless_efi.htm