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#1 |
Registered User
Join Date: Feb 2009
Location: West Chester, PA
Posts: 8
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Leaky gas cap
I recently bought a 2 owner '72 shortbed. The 2nd owner replaced the gas tank and repainted it the original color 6 years ago. It's a 350/350 with a posi rear. I love driving it with one exception- while driving, gas will spill out of the filler when the tank is full to half full. I took off the cap that came with the truck as it wasn't an original. I tried an original with no luck and even tried shimming the gasket with another thin gasket. That helped some, but not enough. Anyone else have issues with repo tanks and filler tubes? I've owned a few 67-72 trucks and never had this come up.
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#2 |
Registered User
Join Date: Apr 2008
Location: Oregon City, Oregon
Posts: 741
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Re: Leaky gas cap
Is the tank vented properly? If not that could contribute to the problem. How much fall do you have from the filler to the tank? And you know someone is going to ask for pictures
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#3 |
1962 C-10
Join Date: Apr 2005
Location: Las Vegas, New Mexico
Posts: 4,978
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Re: Leaky gas cap
My '67 did the same thing. A new gas cap fixed the problem.
__________________
Joseph Chavez ![]() "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4 |
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#4 |
Registered User
Join Date: Feb 2009
Location: West Chester, PA
Posts: 8
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Re: Leaky gas cap
I will check the vent. The tank is a repo behind the seat tank so I'm guessing the fall is ok.
Thanks. |
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#5 |
Registered User
Join Date: Feb 2009
Location: West Chester, PA
Posts: 8
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Re: Leaky gas cap
I'm going to Spring Carlisle so I will shop around for a new one then. Thanks.
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#6 |
Senior Member
![]() Join Date: Dec 2011
Location: South Carolina
Posts: 2,662
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Re: Leaky gas cap
My filler neck has a ding in it from a gas nozzle, it does the same thing. Look carefully at the neck itself. I may try to epoxy it smooth or otherwise fill it.
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#7 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: Leaky gas cap
My '67 did that as well. I replaced the cap with a GM original cap from Classic Industries (wasn't cheap - around 35 bucks) and no problems now. I believe the rim on the tank itself can actually wear and cause leaking too. Unfortunately the repo tanks aren't much better from what I have heard.
__________________
'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#8 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Leaky gas cap
Sadly, most of these trucks will eventually wind up leaking in this area either through wear, overfilling, defective gas caps and/or from crappy aftermarket tanks. Mine used to leak if I over filled it and/or when parked on an incline with too much gas in the tank. A good cap will help and maybe even a new fuel tank (I bought a Spectra and highly recommend that brand).
But, first thing I'd try is a good, new vented cap as mentioned above and then not fill it past the first click on the pump -maybe even shut the pump off before it reaches the neck area. |
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#9 |
Senior Member
![]() Join Date: Dec 2011
Location: South Carolina
Posts: 2,662
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Re: Leaky gas cap
Try to reduce the right turns you make. Seriously, maybe keep the fuel at 1/2 a tank.
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#10 |
English Chevy Owner
Join Date: May 2002
Location: Shropshire, UK/ Lot, France
Posts: 1,848
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Re: Leaky gas cap
Mine also did this when I got it and as the rubber grommet around the filler neck was perished it ran into the cab and stunk me out. A new grommet and new cap sorted it though.
__________________
Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission |
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#11 |
Registered User
Join Date: Feb 2009
Location: West Chester, PA
Posts: 8
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Re: Leaky gas cap
Thanks to all who gave their ideas. I just picked up a repo cap from a Chevy Truck dealer at Spring Carlisle. I will try it early this week.
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#12 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Leaky gas cap
I wasn't going to, but ![]() |
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