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Old 01-14-2020, 11:24 AM   #1
chevycraft
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Gas pouring from the tank fill !!

Okay... I know I could relocate my tank ....but I won`t ... Has anyone found a way to stop the tank from pouring out gas when making a right turn or going on a exit !!
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Old 01-14-2020, 12:01 PM   #2
engineer_gregh
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Re: Gas pouring from the tank fill !!

Mine have never done that. Is the seal on your gas cap bad?
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Old 01-14-2020, 01:16 PM   #3
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Re: Gas pouring from the tank fill !!

I forget what year they changed it. I know my 70 has a vented cap. I'm not sure if it was 71 or 72 they made the change to a sealed cap and a vent inside the truck on the passenger's C pillar (or is it a B pillar). With a vented cap, I don't know there is a good way to stop it. I've tried 3 different caps, same result. It only happens when my tank is full. If I keep it at ~3/4 of a tank, it has been fine.
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Old 01-14-2020, 01:48 PM   #4
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Re: Gas pouring from the tank fill !!

If you have a spill problem you might try one of these fuel flaps..

https://www.pciinc.com/shop-pci/150-...FLAP-p61376480
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Old 01-14-2020, 02:46 PM   #5
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Re: Gas pouring from the tank fill !!

Couple of things happen.

1. They probably overfilled you at the station. I have had them do that on purpose. Tank most likely holds 2 or more gallons after first click on the fuel pump shut off.

2. Think I had a vented cap in the past, got the correct one and changed the gasket to a thicker one from ACE hardware, and no more issues.
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Old 01-14-2020, 02:54 PM   #6
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Re: Gas pouring from the tank fill !!

I haven't had this problem, but I recently switched to a vented cap because I read on this forum to do that to help with fuel/oil issues. My fuel pump died and fuel got into the block. Everyone on the forum said to switch to a vented fuel cap and put a new fuel pump on and it should work. Now I'm second guessing my decision to go to a vented cap...
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Old 01-14-2020, 03:12 PM   #7
68panelman
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Re: Gas pouring from the tank fill !!

My 67 did this on the ride home when i purchased it. Replaced fuel cap with new and problem solved, it had the original cap with a dried up gasket
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Old 01-14-2020, 09:30 PM   #8
custom10nut
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Re: Gas pouring from the tank fill !!

I used to have the problem until I bought a quality cap.
Stant is the one I use, but as precaution, I donít put more that 18 gallons in the tank, unless Iím making a road trip on the Interstate
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Old 01-14-2020, 10:49 PM   #9
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Re: Gas pouring from the tank fill !!

Quote:
Originally Posted by Willys_MB View Post
I haven't had this problem, but I recently switched to a vented cap because I read on this forum to do that to help with fuel/oil issues. My fuel pump died and fuel got into the block. Everyone on the forum said to switch to a vented fuel cap and put a new fuel pump on and it should work. Now I'm second guessing my decision to go to a vented cap...
If you have a '68 truck as shown in your sig, a vented cap is required, since it doesn't have a vapor recovery system. I switched over to a non-locking cap because the locking caps' gaskets go bad so quickly. Mine is a '70 with no vapor recovery system. If you don't have fuel leaking out on right turns, you're fine.
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Old 01-15-2020, 11:42 AM   #10
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Re: Gas pouring from the tank fill !!

Quote:
Originally Posted by Steeveedee View Post
If you have a '68 truck as shown in your sig, a vented cap is required, since it doesn't have a vapor recovery system. I switched over to a non-locking cap because the locking caps' gaskets go bad so quickly. Mine is a '70 with no vapor recovery system. If you don't have fuel leaking out on right turns, you're fine.
X2 on those locking gaskets caps, they are poop!
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Old 01-15-2020, 11:22 PM   #11
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Re: Gas pouring from the tank fill !!

What vented cap is best, that looks original?
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Old 01-16-2020, 01:06 AM   #12
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Re: Gas pouring from the tank fill !!

Mine is chrome plated. That looks good. I don't think that any other finish was offered for a cap that was outside. If you had a locking flap cover like the saddle tanks on my truck have, the cap could be galvanized with two ear flaps. That's what I have on the saddle tanks. You could use that for your main tank, but they are pretty ugly.
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Old 01-16-2020, 01:18 AM   #13
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Re: Gas pouring from the tank fill !!

Quote:
Originally Posted by Astro-Balls View Post
What vented cap is best, that looks original?
I bought a stant because Iíve always had good luck with them. Iím sure other members have their opinions. $10 shipped on rock auto
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Old 01-16-2020, 12:25 PM   #14
toolboxchev
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Re: Gas pouring from the tank fill !!

Quote:
Originally Posted by Astro-Balls View Post
What vented cap is best, that looks original?
I got a chrome plated one from Napa, Stant, I presume. The gasket it comes with only lasts about 6 months, take it off and go over to ACE hardware. There you should be able to find a thicker more durable gasket that fits like a glove. Makes the gas cap tight, but not too difficult.

Let me know if you need some help with that, I could go over to the local store and get a whole bunch of them and spread them around!
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Old 01-16-2020, 12:34 PM   #15
Willys_MB
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Re: Gas pouring from the tank fill !!

Quote:
Originally Posted by toolboxchev View Post
I got a chrome plated one from Napa, Stant, I presume. The gasket it comes with only lasts about 6 months, take it off and go over to ACE hardware. There you should be able to find a thicker more durable gasket that fits like a glove. Makes the gas cap tight, but not too difficult.
That's good to know... mine's only been on for a couple weeks. I'll have to head to ACE soon!
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Old 01-16-2020, 02:16 PM   #16
morepwr
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Re: Gas pouring from the tank fill !!

Mine did that and a new gas cap fixed it. I also learned that the rubber grommet thru the cab isn't great so it would run back in the cab creating a nice "essence de unleaded" in the cab.
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Old 01-16-2020, 06:25 PM   #17
volksworld
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Re: Gas pouring from the tank fill !!

a vented cap isnt just a cap with a hole in it...it is sealed but has a one way valve to allow air into the tank to replace the fuel that is used up...your problem isnt that the cap is vented, your problem is that you bought a cap that is a piece of crap
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Old 01-16-2020, 07:38 PM   #18
lil hoodlum
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Re: Gas pouring from the tank fill !!

I also have a Stant cap. Top my tank off every 10 days as my truck is a daily driver. 1968 C10 with the gas tank in the cab.
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