Gas cap
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
The only reason you would have a non-vented cap is if there was a evap system plumbed in .. There would be 2 fuel hoses going to the engine bay one to the carb and another to a charcoal canister .. My 76 highboy has no such system plumbed and is a vented gas cap ..
Cargo Master
Joined: Oct 2010
Posts: 3,417
Likes: 32
Same here. Mine was a vented cap as well with one fuel line out only.
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Fleet Mechanic
Joined: Feb 2011
Posts: 1,410
Likes: 42
From: Michigan
Thanks guys. I am going to have to find a vented gas cap then since the charcoal canister is long gone. Any one seen a chrome vented cap for the highboy's. I think I found a painted version but would prefer chrome.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
STANT Part # 10623 $3.34
Styleside; W/O Evaporative Emission System; W/Mid, Cab Tanks
https://www.rockauto.com/catalog/x,c...,parttype,5900
Styleside; W/O Evaporative Emission System; W/Mid, Cab Tanks
https://www.rockauto.com/catalog/x,c...,parttype,5900
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Fleet Mechanic
Joined: Feb 2011
Posts: 1,410
Likes: 42
From: Michigan
STANT Part # 10623 $3.34
Styleside; W/O Evaporative Emission System; W/Mid, Cab Tanks
https://www.rockauto.com/catalog/x,c...,parttype,5900
Styleside; W/O Evaporative Emission System; W/Mid, Cab Tanks
https://www.rockauto.com/catalog/x,c...,parttype,5900
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1973 - 1979 F-100 & Larger F-Series Trucks
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