I've got a 4.8L motor in my truck. I've put a LS1 intake manifold on it. I have the returnless style fuel rail and 28.8 injectors. I have a comp 220/222 cam and SLP valve springs. I will be sending the computer out for a tune whenever the truck gets back together. The truck originally had a return style rail on it. I need to know if i should get a fuel pressure regulator. If so what type should i get? Are they universal or specific and what PSI should they be set at? I've got a RCI 20 gallon fuel cell in the back of my truck and a MSD external fuel pump. I've searched to forums but cant find any answers. please help!!!
__________________

 

Yes, you'll need one. You'll also need to find a way to return the fuel to the tank. Easiest thing to do would be find a different set of fuel rails with provisions for a return line and built in regulator. You could also run an external regulator, which would have it's own provision for a fuel return.

Stock fuel pressure is 4 bar IIRC, so your fuel pressure with 0 vacuum in the manifold should be about 58-59 psi. I set mine by leaving the engine off and jumpering the fuel pump relay to turn it on.

 

Do the 97-98 ls1 rails with a return line have a built in regulator? I bought a MSD external pump, do you think it will work? I think it flows 37GPH at 60 psi. Would it be easy to just buy an aftermarket unit and mount it after the pump and run one line to fuel rail and other back to tank? Is it ok to run the regulator and pump at the back of my truck by the cell or should i mount it up front?