Which one is the fuel return? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Pyro · 10-20-2020, 07:09 PM

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.

**hatzie** · 10-21-2020, 08:41 AM

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.

10-20-2020, 07:09 PM	#1
Pyro Registered User Join Date: Jul 2004 Location: New Boston, MI Posts: 71	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.

10-21-2020, 08:41 AM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,912	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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF 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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