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#1 |
Registered User
![]() Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Fuel System Question
I have a 1972 3/4 ton C20. There is no charcoal canister. The gas tank has only 1 main solid filler neck. The sending unit has one large hose and one smaller hose both running to the fuel pump and each hose goes into the pump at their own seperate inlets.
I recently replaced my fuel cap with the one the stant website called for #10623. It was identical to the one that was already on the truck when I bought it. My question is, did my truck come from the factory with a charcoal cannister? Should I have a vented cap or not? Searching posts on this forum, has people saying mostly that a vented cap is needed. But there are a handful of people saying I should use a non vented. I went with the majority and what stant said on their site and got the 10623 vented cap. Is this correct or not??? |
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#2 |
Registered User
![]() Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: Fuel System Question
Here is pics of my gas cap
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#3 |
Registered User
![]() Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: Fuel System Question
Anyone?
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#4 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Fuel System Question
I thought the 71-72's were vented but not sure. You should be able to see if there is a vent in the inside of the cab. It would be off of the filler neck area and go to the underside outside the cab.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#5 |
Registered User
Join Date: Jan 2013
Location: Mickleton, NJ
Posts: 1,776
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Re: Fuel System Question
C-20's and C-30's were exempt from the emissions stuff, so no charcoal canister. So you need the vented cap.
__________________
Shawn 1970 Chevy C-10 SWB, 350, TKO 600 5 speed My build http://67-72chevytrucks.com/vboard/s...d.php?t=559881 |
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#6 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Fuel System Question
I can't say for sure about 72, but in 70 they are non vented and no cannister IFF they're a heavy duty unit (3/4 ton or better).
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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