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Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 10-16-2013   #1 (permalink)
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Default Gas filling up issues

When I got the car the PO said, when filling up, u have to turn the gas nozzle sideways when filling up the tank or the gas pours out. I found out that it doesn't really matter how I turn it, gas comes out. I bought a foot long piece of rubber tubing that I now shove down the gas filler and then put the gas pump into that. The only problem is that I don't know if my tank is full until gas shoots out.

I'm sure you guys have some nifty ideas. I might be the only person that has this problem but its really annoying. I know I'm done filling up when I'm standing in a puddle of gasoline
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Unread 10-16-2013   #2 (permalink)
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Quote:
Originally Posted by myblue67 View Post
When I got the car the PO said, when filling up, u have to turn the gas nozzle sideways when filling up the tank or the gas pours out. I found out that it doesn't really matter how I turn it, gas comes out. I bought a foot long piece of rubber tubing that I now shove down the gas filler and then put the gas pump into that. The only problem is that I don't know if my tank is full until gas shoots out.

I'm sure you guys have some nifty ideas. I might be the only person that has this problem but its really annoying. I know I'm done filling up when I'm standing in a puddle of gasoline
Hi,
I'm thinking our old tanks are vented at the cap, while the new tanks have over ways of venting. When you place these current style nozzles into our tank there air being replace by fuel needs somewhere to go. The filler tube is the only vet for this. I have to do the same even though I have a fuel cell. I turn the hose side-ways with a little gap to allow for fumes to escape. I'm lucky, in that my hose from the cap to the tank is clears. When I fill, I open the tank and can see when I reach the fill level (top of tank).
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Unread 10-16-2013   #3 (permalink)
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The problem is not unique to you. Mine 1969 does that, as well as, friends who have classic mustangs. I have not done any modifications, I just put the gas pump handle on the slowest notch than I estimate when its half full. Above half full, I keep my hand on the pump while I listen for the gas to start choking up. Paying for the gas is the part that is tough to deal with!
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Unread 10-16-2013   #4 (permalink)
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I agree with all Jay's comments; slow towards the end is the only answer. I rarely spill any that way. There is only about 6" between the tip of the nozzle and the top of the tank. On a 'normal' car there is 2 - 3 feet and the nozzle shut-offs work much better.

The tank vent, if any, doesn't have much to do with it. Its the plumbing between the cap and and the tank. New tanks aren't really vented since they have to hold pressure for emission purposes. If they vent with no pressure they will fail an emissions test.
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Unread 10-16-2013   #5 (permalink)
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Glad to hear this isn't just a problem with my car haha. I guess I just have to keep it slower as it gets towards the end. And the rubber hose I use makes it easy except that I have to manually pull back the part on the gas pump so itl start going.
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Unread 10-16-2013   #6 (permalink)
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You young pups are showing your age. The problem is the pump handle, not the car. When these cars were new, the government was not meddling in the gas business. In the 70's, the mandated that cars use unleaded fuel to go with the catalytic converter. To prevent people from using leaded gas in these cars, which would destroy the converter, they put restrictors in the filler tube, so that the pump valve wouldn't fit. The great big traditional filler handles were replaced with the teeny, skinny handles were all know today, far smaller than the real thing these cars were designed for.
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Unread 10-16-2013   #7 (permalink)
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Forgot all about that David! Brilliant! I just leave the key on when refuelling my convertible and stop when the gage reads 3/4. If I fill it above 3/4 it will spill slightly on my sloped driveway.
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Unread 10-17-2013   #8 (permalink)
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I drove a Mustang when the larger nozzles were still in use. They splashed gas out much as did the later, smaller ones.

Some are worse than others but in this case size doesn't matter.
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Unread 10-17-2013   #9 (permalink)
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I got this idea from a mustang guy I knew in Florida. Start with the nozzle sideways (at least a bit) and go slow. His theory was it lets the air find the path out and then you can open up the nozzle a bit more and let it go straight or keep it sideways. I barely put mine at an angle and do the slow to fast theory, but I can't open it all the way or it shuts every time. Had it happen so often I've also gotten in the habit of grabbing a few of those paper towels and putting them below the gas cap just in case - to protect the paint.
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Unread 10-17-2013   #10 (permalink)
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Quote:
Originally Posted by Little Mule View Post
I got this idea from a mustang guy I knew in Florida. Start with the nozzle sideways (at least a bit) and go slow. His theory was it lets the air find the path out and then you can open up the nozzle a bit more and let it go straight or keep it sideways. I barely put mine at an angle and do the slow to fast theory, but I can't open it all the way or it shuts every time. Had it happen so often I've also gotten in the habit of grabbing a few of those paper towels and putting them below the gas cap just in case - to protect the paint.
Hahaha. I have to do that with paper towel too! You guys should try using a rubber tube like I do. Except pulling back the black part on the pump is annoying.
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Unread 10-18-2013   #11 (permalink)
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When I replaced my 68's tank, I first welded a bung hole fitting into the top of the tank next to the neck flange (Yes, new tank with no gasoline as of yet). Drilled the side of the neck up near the opening. Welded a washer around the neck hole and then threaded it. Threaded in a hose fitting. Connecting both tank and neck fittings with a clear tube now acting as a vent hose so I can now hear and watch the gas level as it comes up to the top.

Another issue is the curve of the 67/68 filler neck. It being so curved, and the pump's nozzle is so straight, the fuel ends up blasting against the back of the neck, causing shutoff and back splash. Thus I modified a 65/66 neck (which is much straighter) to fit in the 68. Now it is a much straighter shot down the center of the neck's throat.
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Unread 10-18-2013   #12 (permalink)
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Quote:
Originally Posted by cmayna View Post
When I replaced my 68's tank, I first welded a bung hole fitting into the top of the tank next to the neck flange (Yes, new tank with no gasoline as of yet). Drilled the side of the neck up near the opening. Welded a washer around the neck hole and then threaded it. Threaded in a hose fitting. Connecting both tank and neck fittings with a clear tube now acting as a vent hose so I can now hear and watch the gas level as it comes up to the top.

Another issue is the curve of the 67/68 filler neck. It being so curved, and the pump's nozzle is so straight, the fuel ends up blasting against the back of the neck, causing shutoff and back splash. Thus I modified a 65/66 neck (which is much straighter) to fit in the 68. Now it is a much straighter shot down the center of the neck's throat.
Yeah I think a straighter and see through neck would be a good idea.
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Unread 10-18-2013   #13 (permalink)
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As mentioned before, this problem started with different nozzles. Gas nozzles changed due different standards including air quality. It was presumed that breathing the gas fumes while filling would promote lung cancer, amongst several other myths. The newer nozzle have a boot which collapses and creates pressure within the tank and keeping a majority of the fumes in the tank. The older vehicles needed to vented or you would be unable to fill the tank. What I do is put the nozzle in the tank and pull back on the rubber boot which allows the tank to vent like the older nozzles. If I release the boot, the pump immediately stops pumping and I'm unable to pump gas. I have no problems with filling my tank either.
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Unread 10-19-2013   #14 (permalink)
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Quote:
Originally Posted by imlowr2 View Post
...The newer nozzle have a boot which collapses...pull back on the rubber boot which allows the tank to vent ...
Only some parts of the country have those boots; CA was probably the first state to require them. Nozzles without boots can still slop gas out the filler pipe as they shut off.

The gas needs to back-up in the pipe before the nozzle knows to shut off. There is so little pipe on an early Mustang that with a fast fill rate, by the time the nozzle knows to shut off, the gas is already running out the top.

http://www.cnn.com/2012/05/10/politi...-pump-handles/

Since 1994, gas stations that did not meet air quality standards have been required to use gas vapor recovery systems. The most obvious gas vapor recovery system for drivers is the rubber boot...
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Unread 10-19-2013   #15 (permalink)
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I've never seen this gas nozzle boot that people are speaking of.
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