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Old 04-14-2017, 04:04 AM   #1
Cadillac Kid
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Post I can't Get A Locking Gas cap To Fit? 74' C10

Hello,

I posted a thread awhile ago about not being able to find the correct locking gas cap for my 1974 C10 Fleetside Longbed. I'm pretty frustrated now about the gas cap. In my other thread I mentioned that I tried to modify the stock filler neck to accept the locking cap. (I know, this was the wrong thing to do). The cap I bought originally and still have is Stant 10572.

Today in the mail came another filler neck from a 1978 fleetside that I bought, because the stock filler neck is basically useless now. The locking cap fits in the new filler neck and stays in place if you twist it, like it should. But if you tilt the cap up and down and wiggle it, it just pops out. I feels like the width is too narrow and it is loose in the neck. So I have a new used filler neck, and still don't have a gas cap. Ive spent about 40 dollars in this issue and it is just stupid. Am I doing something wrong, or is the problem with these filler necks?? I know there are tons of people that use locking caps on these trucks, what is the secret?? If you have a locking cap on your truck and know the part number, or have a picture please let me know. I would really appreciate it!

Thank you

-Gavin

Last edited by Cadillac Kid; 04-14-2017 at 04:13 AM.
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Old 04-14-2017, 10:28 AM   #2
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Re: I can't Get A Locking Gas cap To Fit? 74' C10

I don't have an answer on the cap. If theft is the issue, a company makes a spring that goes in the neck to keep siphon hoses out.
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Old 04-14-2017, 10:31 AM   #3
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Re: I can't Get A Locking Gas cap To Fit? 74' C10

Classic Parts of America shows 3 different caps for 73-74, 73-78, & 73-78, I'd call them and see what's up.
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'97 GMC Yukon, 5.7, 4L60, 2 door, 2 wheel drive
'50 Chevy 3100, 307, TH350, S10 Chassis, air ride
'80 C-10, 454, 700R, air ride
'30 Model A Pickup, suicide front end, 350-tri-power. Some call it a "Rat Rod", I call it a Hot Rod!
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Old 04-14-2017, 12:55 PM   #4
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Re: I can't Get A Locking Gas cap To Fit? 74' C10

One problem is that the 70's had a variety of emissions levels. Some could use leaded gas, other required unleaded. Optional gas doors might complicate the issue as well. Cap for a door might need to be a lower profile to allow the door to close.

At least now, you can carry your new filler neck to the parts store and test the caps in the store until you find one that works or you run out of options.

You should check that the rubber filler hoses are the same size for your existing but damaged filler neck and your just acquired one. They should be the same size but....
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Old 04-19-2017, 01:35 AM   #5
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Problem solved!

Hello everyone. I solved my on going problem!

I spent a lot of messing around with the 78' filler neck a few days ago and I called quits. Then that night at 2:00 am I got out of bed because I knew that this was going to be the solution. The two folded in lips on the inside of the filler neck that have the little stops on the end of them (so the gas cap can not rotate 360 degrees) was the problem. Over time I guess the inside folds get worn and pushed down from use. I spent about another half hour trying to figure out how to pry up the inside folds and what tool would work. This was difficult because you can not get a tool in from the backside, and you can't get a pry bar or screwdriver in the front because the front opening of the filler neck is to small. What actually worked perfect, and what I used was one of the hook tools from a swiss army knife. It has a 180 degree bent hook that is made out of thick material, like a fishing hook but much thinker and stronger. I inserted the tool underneath the folds and twisted and lifted the folds up. The locking gas cap fits perfect now, and doesn't come out by its self. It makes sense now why this was the problem. The locking tabs on the gas cap are tapered with a flat spot on the back. The flat spot needs the rest on the inside metal when sprung down in order to not be able to remove the cap. This was the problem.

Thank you for the support. Sorry for the long response. I just wanted to try and make my self clear if someone has this problem in the future. So both filler necks had the same problem. That was very unlikely, but It was the problem.
It also doesn't help that there are many different styles of gas caps for just this range of years. Just makes it more confusing. The filler neck is back on the truck and the gas cap is in, and it locks. Perfect.

-Gavin
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Old 04-19-2017, 06:18 AM   #6
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Re: Problem solved!

Quote:
Originally Posted by Cadillac Kid View Post
Then that night at 2:00 am I got out of bed
Awesome! I thought maybe I was the only one that did stuff like that! LOL
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'50 Chevy 3100, 307, TH350, S10 Chassis, air ride
'80 C-10, 454, 700R, air ride
'30 Model A Pickup, suicide front end, 350-tri-power. Some call it a "Rat Rod", I call it a Hot Rod!
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Old 04-19-2017, 10:21 PM   #7
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Re: I can't Get A Locking Gas cap To Fit? 74' C10

I have one on my 74...went to Napa and had them order it for me
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