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01-09-2013, 06:02 AM | #26 |
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Location: Falls City, Nebraska "100 Miles From Nowhere"
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Re: Which trucks had vent lines on the gas tank?
My 72 C-10 is "vented"
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" |
01-09-2013, 08:05 AM | #27 |
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Join Date: May 2012
Location: Atlanta, GA
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Re: Which trucks had vent lines on the gas tank?
My 72 C-10 is non-vented since it was set up with California Emissions.
Emissions stuff is all gone today and all vents are being capped this week. They were all dry rotted anyway. So I need a vented cap quick!!! Seems they are hard to come by. If anyone knows what brand & p/n will fit, please let me know. Still has original tank.
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72 C10 Deluxe Medium Blue/White 350/350 |
01-09-2013, 10:02 AM | #28 | |
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Re: Which trucks had vent lines on the gas tank?
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01-09-2013, 06:12 PM | #29 |
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Re: Which trucks had vent lines on the gas tank?
So, if 72's came with non-vented caps (other than California) where 73 and up caps non-vented and will they fit?
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1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
01-09-2013, 06:19 PM | #30 |
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Re: Which trucks had vent lines on the gas tank?
Not sure,
I found a vented gas cap that fits great. Autozone P/N 6742. Now I need to find out if it vents in and out to keep the tank stable. Cali trucks should have non-vented gas caps off the assembly line.
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72 C10 Deluxe Medium Blue/White 350/350 |
01-09-2013, 06:21 PM | #31 | |
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Re: Which trucks had vent lines on the gas tank?
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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 |
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01-09-2013, 06:26 PM | #32 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
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Re: Which trucks had vent lines on the gas tank?
I removed all the vent lines and capped them off in my 1972 GMC 1500. I then purchased a "vented" gas cap for a 1972 and it works just fine.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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01-09-2013, 06:33 PM | #33 |
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Re: Which trucks had vent lines on the gas tank?
I just got off the phone with CST - manufacturer of the gas cap (Autozone) 6742. He said it is vented both ways.
-.5 PSI will take from outside air. 3.0 PSI will burb from tank. I was so temped to just drill a small 1/16" hole in mine and be done. Figured I would keep searching. Got what I need now. For $6.99 it may be worth a shot....they'll take it back if it doens't fit.
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72 C10 Deluxe Medium Blue/White 350/350 |
01-09-2013, 06:34 PM | #34 |
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Re: Which trucks had vent lines on the gas tank?
1972SuperSB -
You may have some wear on your filler neck. May be able to install another rubber gasket to get above the wear point. Mine fit so tight I could barely grip the cap.
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72 C10 Deluxe Medium Blue/White 350/350 |
01-09-2013, 07:24 PM | #35 |
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Re: Which trucks had vent lines on the gas tank?
I just overhauled the entire fuel system on a 71 GMC, 1st thing the factory service manual explains the EEC system on 71' 72 and some 70's . If tank has small hose connection on pass side you should use a non vented cap, if the EEC is intact and function able. The system captures fuel vapors and redirects it back to carb to reburn. Early tanks vented caps, both available at NAPA.
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71 C-20 07 Magnum RT AWD |
01-09-2013, 07:48 PM | #36 | |
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Re: Which trucks had vent lines on the gas tank?
Quote:
Posted via Mobile Device
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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 |
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