I have a returnless FI rail in my 1MZ-FE V6 MR2 project but the 1986 tank in the MR2 has a return line. I keep reading about swaps were someone will go get an older return style fuel rail from an early 1MZ-FE but that requires a fuel pump in the tank with a regulator. I am definitely not pulling the tank again, so I have been reading up on AEM and Aeromotive's sites and it appears that I can use a bypass FPR and run from the pump to the filter and then to the fuel rail. It looks like this arrangement would require the return style fuel rail which would run to the FPR and then back to the return line to the tank. Can anyone confirm this is the correct way to do it?
I used a bypass regulator for a carb conversion, and also a few efi swapswhere theres only one rail fittingfor pressure. The way i did it was to get a cheap Chinese knockoff from ebay. The top three ports are inlet for pressure and outlet to fuel rail. Third was blocked. The bottom port is to the return line. It sets the pressure to the fuel rail via restricted return line port size.
My LS swap Camaro uses an early C5 Corvette fuel filter with a regulator built in. Pump in tank, to filter, output to engine, bypass right back to the tank. No reason you couldn't mount a regulator at the tank, as long as you are modern enough to not need a vacuum signal.
Thanks Duster. So the feed line from the pump and fuel filter will be plumbed to the top inlet port and the 2nd top port will feed pressure to to the single rail line. The bottom line on the FRP is the return line so it will be plumbed to return line to the tank. I'll have a pressure gauge on the FPR so I can set the output pressure at the required 44-50 PSI. Sounds simple enough, just need to figure out how best to convert from the toyota stock fuel pressure rail fitting to an AN style fitting.
Streetwiseguy said:
My LS swap Camaro uses an early C5 Corvette fuel filter with a regulator built in. Pump in tank, to filter, output to engine, bypass right back to the tank. No reason you couldn't mount a regulator at the tank, as long as you are modern enough to not need a vacuum signal.
Just looked that up, interesting as I see that filter could be used to replace the filter and regulator and has provisions for the return line. Only issue is it is not adjustable for pressure.
