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Old 10-20-2020, 07:09 PM   #1
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Pyro's Avatar
Join Date: Jul 2004
Location: New Boston, MI
Posts: 71
Arrow Which one is the fuel return?

Got a 2000 Silverado, originally a 4.8L. Put a 6.2 in, doing custom fuel system, removed all the factory fuel lines and swapped a Walbro 255 pump in. Used factory fuel sending unit, but didn't pay attention to which line was which when I took it all apart. The main feed line is obvious, being the largest, and I think the return is the other outer line, assuming the middle line is the evap line. Am I right or is the center line the return?

I'm talking about the ports coming right off the fuel sending unit on top of the tank.
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Old 10-21-2020, 08:41 AM   #2

hatzie's Avatar
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,138
Re: Which one is the fuel return?

You're going to have to look on the bottom of the fuel pump/sender module hat to see what's what.
Return should have a pipe and vapor should have some kind of screened hat... I would think.
Your other option would be a walk in the u-pullit graveyards to get a look.
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8

RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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