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05-22-2014, 03:45 PM
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#1 |
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Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
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Do I have the wrong gas cap?
Just went to take my gas cap off after replacing it recently. First time I have taken it off and there was a good amount of vacuum. I am thinking that maybe I got a non-vented cap by accident? Are we supposed to run vented caps on our trucks? BTW I have the in-cab tank with a V6 and Holley.
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05-22-2014, 03:56 PM
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#2 |
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Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: Do I have the wrong gas cap?
Should be vented...sounds like it's not.
__________________
I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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05-22-2014, 03:57 PM
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#3 |
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Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
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Re: Do I have the wrong gas cap?
I'm guessing if there is vacuum on the tank that means not vented cap? Would vented mean there is a one way valve to let air into the tank but not let gas/fumes into the atmosphere?
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05-22-2014, 04:19 PM
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#4 | |
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Registered User
Join Date: Jan 2010
Location: Roanoke, Tx.
Posts: 1,561
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Re: Do I have the wrong gas cap?
Quote:
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05-22-2014, 09:46 PM
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#5 |
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Registered User
Join Date: Feb 2013
Location: Sapulpa Oklahoma
Posts: 197
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Re: Do I have the wrong gas cap?
Last 2 I bought at parts store and truck supplier ended up not vented . I took small plastic cap on bottom side of cap and took out spring and rubber check valve. Put small cap back on works now. Cheap fix.
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05-23-2014, 10:26 AM
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#6 |
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Registered User
Join Date: Mar 2014
Location: MD/VA/PA Or Inbetween
Posts: 413
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Re: Do I have the wrong gas cap?
If a vented cap is gonna make me smell gas around the cap then I'll leave the non-vented and just crack it from time to time. Doesn't seem to be much of an issue and I am sure I'll eventually do an engine swap with return line.
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05-23-2014, 01:20 PM
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#7 |
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Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: Do I have the wrong gas cap?
Without a vented cap you may eventually collapse a line or the tank. At a minimum it can cause fuel supply issues. The vent is mainly to allow air in to replace the fuel going out.
__________________
I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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05-24-2014, 12:44 AM
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#8 |
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Registered User
 Join Date: May 2014
Location: Western ND
Posts: 198
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Re: Do I have the wrong gas cap?
on a hot day it will also cause vapor lock, fuel will boil a a lower temp n a vacuum.
__________________
Current Project : 1962 Chevy SWB Fleetside Others, 1958 Edsel Villager Station Wagon 1926 Ford Model T Roadster Hotrod www.suedescarclub.com |
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05-24-2014, 02:16 AM
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#9 |
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Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,128
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Re: Do I have the wrong gas cap?
Hold it right there...
1965 GMC 4WD 3/4 Ton Fleet V6 SM420 D44/60 I request lots of pics of this truck. 
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