Help picking Fuel Pump 4 Vortec Conversion

[minime's 68']

I know that the vortec needs a certain PSI for the fuel pump, but I have no idea what it is. I was hoping that you great guys would let me know what some of you have used and what you know about the PSI that they need to run properly. Thank For Any Input!!!!

[sandking]

If you are talking about a Gen III engine, you need about 58 psi. You need a regulator anyway, so get a high flow efi pump good for 60-70psi and regulate it to your needs.

[1moretoy]

i think these motors come with a regulator on the fuel rail. not positive though

[MonteSS454]

Vortecs need 66psi at key on and atleast 60psi after start.

[1moretoy]

any one else as im gonna do this same swap. talked to a guy at summit he said i can use their inline fuel pump up to 85 psi off of my fuel cell run a return line and the regulator on the motor will ajust itself. does this make sense please help thanks.

[MonteSS454]

Yes the regulator regulates the pressure down for the CSFI, where it only shoots gas on the particular injector to which cylinder hits on the rotor, like when cylinder 1 hits, that injector squirts.

The regulator isn't in the fuel rail, it's in the spider injectors.

[1moretoy]

ttt is that all i need for my fuel system to run my 5.3