Fuel System Advice Needed! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Crash0637 · 06-23-2016, 01:49 PM

Help! I am looking for some advice from you gurus out there. I promise I have searched this site and a few others but can't seem to find an exact answer as many threads get so caught up in which fittings are what and so on.

I am trying to figure out my fuel system plumbing/routing.

I have an F-Body tank with a fuel pressure regulator in the tank assembly. The motor is a 2002 5.3 Truck motor that is completely stock. This engine fuel setup is with a regulator on the rail and a return line.

I understand I cant run two regulators.

Is my best option to swap the fuel rail out in favor for the newer truck OEM return-less fuel rail and then run a corvette filter setup?

I have two friends that know quite a bit about ls swaps and they both have differing opinions.

Please help me. Thank you in advance!

**mongocanfly** · 06-23-2016, 04:18 PM

On mine I used a pushlock to -an fitting on the return rail barb and then put a -an cap on it..easy peasy..btw the corvette filter has a regulatory built into it.

ls1nova71 · 06-23-2016, 09:13 PM

What f body tank do you have? Early ones were for return type systems where as LS1 tanks have the regulator built into them. I believe that the later 98-02 6 cylinder cars used a return, but dont quote me on that. But if you have an LS1 pump, there is a line coming out of the tank that T's off a little ways out side of the tank and one line goes to the rail and the other goes back to the tank. You won't need a corvette filter/regulator with that pump, but I would recommend switching to a factory returnless rail if you do so.

Crash0637 · 06-24-2016, 07:58 AM

Yes, I have the LS1 fuel pump assembly with the fuel pressure regulator in the tank.

So basically you are saying get a returnless fuel rail on the motor with this pump set up correct? If that is the case how should I run the lines?

**mongocanfly** · 06-24-2016, 12:07 PM

You can swap the rail or cap the return..works either way..I haven't used a pump setup like yours..I've always used stock tank with external walbro and the vette filter/reg and the vette reg dumps back into the tank..

06-23-2016, 01:49 PM	#1
Crash0637 Registered User Join Date: Jun 2014 Location: Orlando, Fl Posts: 36	Fuel System Advice Needed! Help! I am looking for some advice from you gurus out there. I promise I have searched this site and a few others but can't seem to find an exact answer as many threads get so caught up in which fittings are what and so on. I am trying to figure out my fuel system plumbing/routing. I have an F-Body tank with a fuel pressure regulator in the tank assembly. The motor is a 2002 5.3 Truck motor that is completely stock. This engine fuel setup is with a regulator on the rail and a return line. I understand I cant run two regulators. Is my best option to swap the fuel rail out in favor for the newer truck OEM return-less fuel rail and then run a corvette filter setup? I have two friends that know quite a bit about ls swaps and they both have differing opinions. Please help me. Thank you in advance!

06-23-2016, 04:18 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: Fuel System Advice Needed! On mine I used a pushlock to -an fitting on the return rail barb and then put a -an cap on it..easy peasy..btw the corvette filter has a regulatory built into it.

06-23-2016, 09:13 PM	#3
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Fuel System Advice Needed! What f body tank do you have? Early ones were for return type systems where as LS1 tanks have the regulator built into them. I believe that the later 98-02 6 cylinder cars used a return, but dont quote me on that. But if you have an LS1 pump, there is a line coming out of the tank that T's off a little ways out side of the tank and one line goes to the rail and the other goes back to the tank. You won't need a corvette filter/regulator with that pump, but I would recommend switching to a factory returnless rail if you do so. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

06-24-2016, 07:58 AM	#4
Crash0637 Registered User Join Date: Jun 2014 Location: Orlando, Fl Posts: 36	Re: Fuel System Advice Needed! Yes, I have the LS1 fuel pump assembly with the fuel pressure regulator in the tank. So basically you are saying get a returnless fuel rail on the motor with this pump set up correct? If that is the case how should I run the lines?

06-24-2016, 12:07 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,671	Re: Fuel System Advice Needed! You can swap the rail or cap the return..works either way..I haven't used a pump setup like yours..I've always used stock tank with external walbro and the vette filter/reg and the vette reg dumps back into the tank.. Last edited by mongocanfly; 06-24-2016 at 12:24 PM.

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