Help picking Fuel Pump 4 Vortec Conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

minime's 68' · 06-18-2009, 10:22 PM

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 · 06-19-2009, 12:00 AM

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 · 06-19-2009, 12:11 AM

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

*MonteSS454* · 06-19-2009, 01:51 AM

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

1moretoy · 06-20-2009, 12:37 PM

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* · 06-20-2009, 06:15 PM

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 · 06-21-2009, 12:54 PM

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

06-18-2009, 10:22 PM	#1
minime's 68' Registered User Join Date: May 2007 Location: Utah Posts: 53	Help picking Fuel Pump 4 Vortec Conversion 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!!!!

06-19-2009, 12:00 AM	#2
sandking .....I am working on it..... Join Date: Jul 2007 Location: Anaheim Hills, Ca Posts: 960	Re: Help picking Fuel Pump 4 Vortec Conversion 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. __________________ . . . . . View my build thread HERE Last edited by sandking; 06-19-2009 at 12:02 AM.

06-19-2009, 12:11 AM	#3
1moretoy Registered User Join Date: Jul 2008 Location: san jose ca Posts: 467	Re: Help picking Fuel Pump 4 Vortec Conversion i think these motors come with a regulator on the fuel rail. not positive though

06-19-2009, 01:51 AM	#4
MonteSS454 Account Suspended Join Date: Jun 2007 Location: Claremore, Oklahoma Posts: 821	Re: Help picking Fuel Pump 4 Vortec Conversion Vortecs need 66psi at key on and atleast 60psi after start. Last edited by MonteSS454; 06-19-2009 at 01:51 AM.

06-20-2009, 12:37 PM	#5
1moretoy Registered User Join Date: Jul 2008 Location: san jose ca Posts: 467	Re: Help picking Fuel Pump 4 Vortec Conversion 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.

06-20-2009, 06:15 PM	#6
MonteSS454 Account Suspended Join Date: Jun 2007 Location: Claremore, Oklahoma Posts: 821	Re: Help picking Fuel Pump 4 Vortec Conversion 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. Last edited by MonteSS454; 06-20-2009 at 06:16 PM.

06-21-2009, 12:54 PM	#7
1moretoy Registered User Join Date: Jul 2008 Location: san jose ca Posts: 467	Re: Help picking Fuel Pump 4 Vortec Conversion ttt is that all i need for my fuel system to run my 5.3



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