Fuel Return Line/Vent - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldCreek · 08-27-2007, 04:46 PM

OK. Who has opened this up? What mechanism is in there? I don't want to open mine up. I assume a T.... maybe a ball/float mech?

To catch some of us up... there are 3 lines going into this. 2 top lines run to either side of the top of the gas tank. The bottom line runs to the engine bay and should be a return line from the fuel pump. Mine is not connected to the pump... nor is it capped off! It's just sitting open. How does the evap cannister fit into this picture?

Thanks,
Wil

OldCreek · 08-27-2007, 04:52 PM

I'm guessing the tube rises higher than the tank to keep fuel from running back into it. I'm also guessing the return line splits into two at this point so that the fuel will run into either side of the tank in case the burb is tilted on either side.

Also guessing that a evap cannister would plumb off the carb?

Wil

**uncle** · 08-27-2007, 08:58 PM

The canister should be attatched to the p/s fender.

08-27-2007, 04:46 PM	#1
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Fuel Return Line/Vent OK. Who has opened this up? What mechanism is in there? I don't want to open mine up. I assume a T.... maybe a ball/float mech? To catch some of us up... there are 3 lines going into this. 2 top lines run to either side of the top of the gas tank. The bottom line runs to the engine bay and should be a return line from the fuel pump. Mine is not connected to the pump... nor is it capped off! It's just sitting open. How does the evap cannister fit into this picture? Thanks, Wil Attached Images __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

08-27-2007, 04:52 PM	#2
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: Fuel Return Line/Vent I'm guessing the tube rises higher than the tank to keep fuel from running back into it. I'm also guessing the return line splits into two at this point so that the fuel will run into either side of the tank in case the burb is tilted on either side. Also guessing that a evap cannister would plumb off the carb? Wil __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

08-27-2007, 08:58 PM	#3
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,286	Re: Fuel Return Line/Vent The canister should be attatched to the p/s fender.



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