Which fuel rail? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rwade · 12-03-2012, 01:50 PM

I had a 4.8L (2000, return rail intake) in my 72 and I'm changing it out to a cam'ed LQ9 (out of a 2005 escalade, non return fuel rail). I was wanting some input as to which is better or worse. I was going to use the return rail on it because my stainless fuel hose is already set up for it. Thanks for any input.
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BR3W CITY · 12-03-2012, 02:30 PM

If your already setup for it, just keep the return setup. There isn't a performance advantage to changing out, you already have the stuff, and you can always change up to an aftermarket rail and regulator using the return setup easily.

Wasted Income · 12-03-2012, 04:06 PM

I would stick with the return style setup from the 4.8. However, you will have to change the fueling tables in your PCM to the return style values, vs. the returnless values. I don't have EFI Live open in front of me right now, but assuming your injectors are the same lb/hr as an earlier 6.0, you can find the values in a 6.0 file that uses return style fuel system.

rwade · 12-03-2012, 04:15 PM

I am having the computer done at current performance, which is who did the wiring harness. I will make sure the correct files are put in the PCM. Thanks for the responses.
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12-03-2012, 01:50 PM	#1
rwade Registered User Join Date: Apr 2010 Location: Louisiana Posts: 970	Which fuel rail? I had a 4.8L (2000, return rail intake) in my 72 and I'm changing it out to a cam'ed LQ9 (out of a 2005 escalade, non return fuel rail). I was wanting some input as to which is better or worse. I was going to use the return rail on it because my stainless fuel hose is already set up for it. Thanks for any input. Posted via Mobile Device

12-03-2012, 02:30 PM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Which fuel rail? If your already setup for it, just keep the return setup. There isn't a performance advantage to changing out, you already have the stuff, and you can always change up to an aftermarket rail and regulator using the return setup easily. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-03-2012, 04:06 PM	#3
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: Which fuel rail? I would stick with the return style setup from the 4.8. However, you will have to change the fueling tables in your PCM to the return style values, vs. the returnless values. I don't have EFI Live open in front of me right now, but assuming your injectors are the same lb/hr as an earlier 6.0, you can find the values in a 6.0 file that uses return style fuel system. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

12-03-2012, 04:15 PM	#4
rwade Registered User Join Date: Apr 2010 Location: Louisiana Posts: 970	Re: Which fuel rail? I am having the computer done at current performance, which is who did the wiring harness. I will make sure the correct files are put in the PCM. Thanks for the responses. Posted via Mobile Device

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