72 k10 fuel tank question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

suburban99 · 01-08-2017, 01:27 PM

Is this a condensing loop for fuel vapors? It comes from the engine bay
And is unhooked at the engine end...truck has a 350 with a quadrajet 4 barrel.
I am doing a 6.0 LS swap soon and need a return line to the tank...

**Boog** · 01-08-2017, 02:28 PM

It is part of the EEC system. Emissions control. That smaller line goes up into the rear corner of the cab and then down to the frame. From there is goes forward to a charcoal canister up front then back to the carb.
Does the gas tank sending unit have one outlet on it or two? If it has two the 3/8 line is engine supply and the 1/4 is a return line from the fuel pump.

suburban99 · 01-08-2017, 02:32 PM

No charcoal canister on this truck. End of hose in engine bay is loose. The sending unit on tank has one line, but there is a second line to the corner of the tank on the passenger side (just out of the picture)

01-08-2017, 01:27 PM	#1
suburban99 Registered User Join Date: May 2014 Location: Mission BC Posts: 452	72 k10 fuel tank question Is this a condensing loop for fuel vapors? It comes from the engine bay And is unhooked at the engine end...truck has a 350 with a quadrajet 4 barrel. I am doing a 6.0 LS swap soon and need a return line to the tank... Attached Images __________________ 1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped

01-08-2017, 02:28 PM	#2
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,445	Re: 72 k10 fuel tank question It is part of the EEC system. Emissions control. That smaller line goes up into the rear corner of the cab and then down to the frame. From there is goes forward to a charcoal canister up front then back to the carb. Does the gas tank sending unit have one outlet on it or two? If it has two the 3/8 line is engine supply and the 1/4 is a return line from the fuel pump. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

01-08-2017, 02:32 PM	#3
suburban99 Registered User Join Date: May 2014 Location: Mission BC Posts: 452	Re: 72 k10 fuel tank question No charcoal canister on this truck. End of hose in engine bay is loose. The sending unit on tank has one line, but there is a second line to the corner of the tank on the passenger side (just out of the picture) __________________ 1962 C10 Longbox LS 5.3 4L60E----Sold$$ 2014 Ram 4x4 3500 Laramie Diesel..Momma's truck 2015 Ram 4x4 1500 1997 Boxster. 1972 K10 Custom Deluxe LS 6.0 1950 GMC 3100 S10 & LS swapped

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