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Old 03-12-2018, 05:44 PM   #1
custom10nut
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Filler neck Checkvalve?

I searched couldn't find any other threads, so maybe I have the wrong terminology.
Is there such a thing as an insert, to go into the filler neck, to prevent the gas from sloshing out on a Righthand turn, when the tank is full?
All newer vehicles were equipped with the trapdoor the the pump nozzle goes into.
I'm thinking about fabricating an insert, but haven't figured out how to secure it
(No, I'm not going to try to weld it)
Some will say "Just relocate the tank", but I want to leave it in the cab.
Back to my original question.
Is there a vendor that makes/sells an insert like this?
Thanks in advance
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Old 03-12-2018, 07:00 PM   #2
randy500
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Re: Filler neck Checkvalve?

I use a gas cap and it works pretty well.
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Old 03-12-2018, 08:50 PM   #3
Steeveedee
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Re: Filler neck Checkvalve?

The correct gas cap avoids this problem. If you make a right turn, it takes enough time for fuel to slosh that a trap door isn't going to help, especially, iirc, there are vent holes in the rest of the reducer in the neck for vapors to be pulled back into the vapor recovery hose. Maybe you don't have those fuel nozzles where you live- they are mostly used in high pollution areas.
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Old 03-12-2018, 10:08 PM   #4
custom10nut
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Re: Filler neck Checkvalve?

I had several different types. The one that works best is the Standard Stainless vented cap (Stant), but it will still leak some on a right turn with the tank full.
The only one I've ever had that didn't leak was not vented, so in the end I couldn't use it.
I didn't mention before that my truck is a 70, so I need the vented cap.
I guess the reason this is now going to be an issue is that I'm about to start prepping to paint my truck, and I don't want to ruin a new paint job.
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Old 03-12-2018, 10:21 PM   #5
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Re: Filler neck Checkvalve?

Yes, it's a frustrating problem - I've only had one truck do it and the only semi-solution was to replace the cap(s) until one sealed better than the rest. Kinda frustrating. Luckily I wasn't concerned with paint just yet, but the smell about asphyxiated me... So I only turned left from then on.
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Old 03-12-2018, 11:03 PM   #6
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Re: Filler neck Checkvalve?

Turn left, go fast. The life of a stock car racer. Yeah buddy!
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Old 03-12-2018, 11:27 PM   #7
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Re: Filler neck Checkvalve?

Are you in the habit of clicking away on the nozzle after it first shuts itself off?
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Old 03-13-2018, 01:00 AM   #8
Warrens69GMC
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Re: Filler neck Checkvalve?

maybe an anti siphon device?
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Old 03-13-2018, 08:12 PM   #9
custom10nut
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Re: Filler neck Checkvalve?

Quote:
Originally Posted by Warrens69GMC View Post
maybe an anti siphon device?
Will this fit into my filler neck? And where could I get one?
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Old 03-13-2018, 09:24 PM   #10
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Re: Filler neck Checkvalve?

I never fill mine up all the way.
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Old 03-13-2018, 10:11 PM   #11
custom10nut
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Re: Filler neck Checkvalve?

Quote:
Originally Posted by 1968aj View Post
I never fill mine up all the way.
I agree, and that's what I do, most of the time. But I'm are I'm not the only one who has this issue, and that the factory didn't have this flaw identified. It's most likely why they went with the vented tank in '71-72
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Old 03-14-2018, 05:29 AM   #12
697498chevy
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Re: Filler neck Checkvalve?

Have you tried a Car Quest #10623 ? It works well on my 1969 C 10 . I did replace the gas tank a while back though .
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Old 03-14-2018, 06:36 AM   #13
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Re: Filler neck Checkvalve?

A cap has to be pretty lousy to let gas leak out making turns. A sure sign a better cap is needed. I've had them get bad to where they will leak when parked with the left side down when I had just filled up. And that is usually once it sat a while, like when it is hot and needs vented
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Old 03-14-2018, 09:42 AM   #14
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Re: Filler neck Checkvalve?

Mine leaks also on my 72. Interesting note, I found that the rubber gasket for the gas cap is the same size as the one on the gas tank of my 1960 Harley Panhead. So I grabbed one of those from the Harley dealership and it helped a bunch. I think a vented gas cap is going to leak a little bit no matter what, just by it's design. Unless possibly there is one made that has a spring type check valve almost like a thermostat to let pressure seep out but not be completely open all the time.
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