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Old 05-22-2010, 11:37 AM   #1
spavinaw
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Can you smell that??

Need a little help with the smell of gas in the cab. When I fill the tank up to more than 3/4 full the fumes are terrible in the cab. Is there a vent issue that I need to check or is this normal?

I usually avoid it by only putting enough gas in to half or a little more.
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Old 05-22-2010, 11:53 AM   #2
rbagley
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Re: Can you smell that??

Mine smells too but it is the same with 1/2 or 3/4 of a tank. Maybe you have a leak somewhere up higher in the tank?
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Old 05-22-2010, 02:30 PM   #3
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Re: Can you smell that??

do we need to guess the year?? if so is there a prize?
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Old 05-22-2010, 02:49 PM   #4
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Re: Can you smell that??

Assume you are talking about the tank behind the seat. It could be as simple as replacing the gas cap. When the seal goes bad, you can get gas smell -- worse with more fuel in the tank, worse with the window down, worse on right-hand turns....
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Old 05-22-2010, 02:50 PM   #5
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Re: Can you smell that??

Quote:
Originally Posted by cdowns View Post
do we need to guess the year?? if so is there a prize?
Sorry. 1968 GMC behind the seat

Last edited by spavinaw; 05-22-2010 at 02:52 PM.
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Old 05-22-2010, 03:04 PM   #6
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Re: Can you smell that??

also another is the sending unit// the rubber oring gasket between the sending unit and tank dryrots and will leak fumes and liquid
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Old 05-22-2010, 06:38 PM   #7
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Re: Can you smell that??

i agree with the gas cap been there
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Old 05-22-2010, 06:51 PM   #8
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Re: Can you smell that??

X3 on the gas cap. Been there more than once.
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Old 05-22-2010, 06:56 PM   #9
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Re: Can you smell that??

Check the gas cap, also check the filler neck. A lot of times that is cracked from years of pushing/pulling/resting the gas filler on it at the station.

I would also check the sending unit gasket and the rubber lines that connect the sending unit to the hard lines.
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Old 05-22-2010, 08:58 PM   #10
pat 70/71
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Re: Can you smell that??

also check the vent lines. some of them run up and over the back window in the cab. still cannot believe GM did that x4 on the gas cap also . cheers, Pat
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Old 05-23-2010, 12:11 AM   #11
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Re: Can you smell that??

X4 on the "vented style" gas cap. Previous non-vented cap = a gas buzz.
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Old 05-24-2010, 04:39 PM   #12
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Re: Can you smell that??

Bought the new gas cap, filled her up and viola!!!! Thanks for the help!!! I love my truck more and more everyday!
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Old 05-24-2010, 07:57 PM   #13
michael bustamante
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Re: Can you smell that??

just blame it on the dog. I do
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Old 05-24-2010, 08:08 PM   #14
basemodel67
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Re: Can you smell that??

Yeah, I sometimes smell gas in my truck... and it's not liquid form, usually.
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Old 05-24-2010, 08:47 PM   #15
Jacfourteen
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Re: Can you smell that??

Quote:
Originally Posted by basemodel67 View Post
Yeah, I sometimes smell gas in my truck... and it's not liquid form, usually.
I have that problem too, but its usually when I have my dog or my father-in-law riding with me .
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Old 05-24-2010, 09:28 PM   #16
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Re: Can you smell that??

So wheres the best place to get a replacement gas cap? because I have the same problem, and my wife wont go anywhere with me in it because of the smell.
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Old 05-24-2010, 09:53 PM   #17
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Re: Can you smell that??

Got mine at Napa.
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Old 05-25-2010, 12:10 AM   #18
Jacfourteen
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Re: Can you smell that??

got mine at kragens, any autoparts place will have them.
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41 3/4 ton (wife's)-flatbed, fully restored to original
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