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Old 10-18-2013, 06:15 PM   #1
Jonboy
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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?
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Old 10-18-2013, 06:55 PM   #2
ls1nova71
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Re: Quick fuel rail question

2004 most went to returnless, however, the flex fuel engines were still return style.
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Old 10-19-2013, 09:16 AM   #3
Jonboy
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Re: Quick fuel rail question

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