Quick fuel rail question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jonboy · 10-18-2013, 06:15 PM

When did the trucks (5.3 specifically) go to using the returnless system? I have a return style system on my engine (2000 Yukon). What year did they stop with this style? I have access to the fuel lines from a 2004 Suburban; will they work?

ls1nova71 · 10-18-2013, 06:55 PM

2004 most went to returnless, however, the flex fuel engines were still return style.

Jonboy · 10-19-2013, 09:16 AM

Cool, thanks for the help. Which engine code (VIN character) is the flex fuel engine?

10-18-2013, 06:15 PM	#1
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Quick fuel rail question When did the trucks (5.3 specifically) go to using the returnless system? I have a return style system on my engine (2000 Yukon). What year did they stop with this style? I have access to the fuel lines from a 2004 Suburban; will they work? __________________ 1974 Jimmy- 5.3/4L80e/NP241

10-18-2013, 06:55 PM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,118	Re: Quick fuel rail question 2004 most went to returnless, however, the flex fuel engines were still return style. __________________ 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

10-19-2013, 09:16 AM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Quick fuel rail question Cool, thanks for the help. Which engine code (VIN character) is the flex fuel engine? __________________ 1974 Jimmy- 5.3/4L80e/NP241



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