Question about fuel lines from tank to fuel pump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972SUPERSB · 10-05-2012, 01:26 AM

I noticed one of the lines was capped off at my fuel pump. I'm thinking its the vent hose if these trucks had one? The fuel pump has the feed from tank, then feed to carb them the other is capped off. There is also a hard line coming up the frame from tank that just ends right before the fuel pump, so I'm pretty sure the capped line goes there. Does anyone have a diagram of where all the fuel lines hook up too? I also looked behind seat and saw 2 lines running up passenger side cab? Thought that was pretty wierd. Any help would be appreciated.
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**RenoKeene** · 10-05-2012, 09:05 AM

I believe that is for the charcoal canister that most folks threw away.

Lee H · 10-05-2012, 09:44 AM

72s have 3 lines, main feed to the pump, a return from the pump to the tank, and one emission line to the charcoal canister. This ends just in front of the front cross member. Lots of people plug the emission line and toss the canister.
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10-05-2012, 01:26 AM	#1
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	Question about fuel lines from tank to fuel pump I noticed one of the lines was capped off at my fuel pump. I'm thinking its the vent hose if these trucks had one? The fuel pump has the feed from tank, then feed to carb them the other is capped off. There is also a hard line coming up the frame from tank that just ends right before the fuel pump, so I'm pretty sure the capped line goes there. Does anyone have a diagram of where all the fuel lines hook up too? I also looked behind seat and saw 2 lines running up passenger side cab? Thought that was pretty wierd. Any help would be appreciated. Posted via Mobile Device __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior

10-05-2012, 09:05 AM	#2
RenoKeene Florida Edition Join Date: Oct 2010 Location: Fruitland Park, FL Posts: 4,028	Re: Question about fuel lines from tank to fuel pump I believe that is for the charcoal canister that most folks threw away. __________________ 70 GMC Short Stepside "Rose"-An American Beauty: Factory 402/TH400, AM/FM, AC, Tilt, Tach, Buckets, Posi, PS, PB, 3-5 Drop, Complete Resto-Rod 67 C-20 Slant Back Wrecker "Mad Max" 67 C-10 Ratrod "Step-N-Wolf" 71 Serro Scotty Sportsman camper "Scotty" 97 LT1 Z28 "The Hornet" Link to more pics of "Rose" http://67-72chevytrucks.com/vboard/a...p?albumid=1684 Check out my "Cheap Tricks" thread and add to it if you can, lots of good info there. http://67-72chevytrucks.com/vboard/s...d.php?t=489394

10-05-2012, 09:44 AM	#3
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Question about fuel lines from tank to fuel pump 72s have 3 lines, main feed to the pump, a return from the pump to the tank, and one emission line to the charcoal canister. This ends just in front of the front cross member. Lots of people plug the emission line and toss the canister. Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

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