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HEET

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Fred: I remember putting Heet in my Dad's 47 Plymouth and I used to put it in 49 Chevy. In the concentration it would be, I can't imagine that it would cause a problem. Course I didn't have SU's on either of those cars. I had a 52 Mark IV but don't remember if I used it in that one though. Probably, I was living in New England at the time and Heet was a standard additive in the winter.

Perhaps someone else has a more definitive answer for you.

Cheers, Tinkerman
 
Like Tinkerman said, Heet has been around for a long time and is a trusted product.

In the red bottles the main ingredient is methanol alcohol, and in the yellow bottles the main ingredient is isopropanol alcohol.

Both will absorb water and prevent ice from forming, but once ice has formed only the isopropanol (yellow bottle) will melt it.

Truckers buy isopropanol in gallon and larger quantities for use in diesel fuel to keep it from jelling. I used it in a GM diesel I drove with excellent results.

I have used the isopropanol since I first started driving for gas lines after they had froze shut and it has never failed me.

It is easy to test for yourself. just put a little fuel in a glass container and add a teaspoon or so of water. Then pour in a little of either kind of Heet.

Then try the same only with a small piece of ice. Use the methanol in one container, and the isopropanol in another.
 
Whats the difference between "ISOPROPANOL ALCOHOL" and 'ISOPROPOL ALCOHOL' you find in your medicine cabinet.
(AND can you use the LATTER)in your gas tank?
I think the stuff in the AUTO section is the SAME STUFF.
Lets not have TOO MANY brain cramps now!
Ken(alias myspitfire).....also you can buy-it 70% OR 91% alcohol...get the right answer & win $100.00 ;-)
 
Actually, I think it was Cristy's (sp?) Dry Gas that I used to use back in the 1970s in my Mk3 Spitfire. For some reason, the fuel line and/or SUs would freeze up right around 31 degrees F. /bcforum/images/%%GRAEMLIN_URL%%/grin.gif So long as I was religious about using dry gas, I never had a problem. Forget one time in the cold, and that was it! Oddly, I never had a problem with my TR3A, or the Heralds, or even the GT6+. The GT had its own problems in extreme cold, but frozen carbs and/or gas lines were not among those problems.
 
Methyl Hydrate is used regularly up here in the frozen north if you get WATER as a condensate. This is usually seen as frost on the inside of your gas cap after parking in a heated garage, then left outside on sub zero weather overnight.
A 4 oz. dose in the average(??) 20 gal tank will cure this. However, if your using ethanol blended gas, the ethanol will eat all the WATER in the gas

Why do you think your getting condensate in your tank in ol'OK in the first place???
 
Why do I think I have condensate, I don't know, just trying to eliminate some possibilities. Just recently had a professional tune up job done. Plugs, points, timing, carbs, new intake manifold gasket and new fuel pump. Car ran like new for 150 miles and then after sitting outside on a cold, damp day (it usually stays in a heated garage unless I'm driving it), it started sputtering and backfiring so bad I barely got it back home. Sounded like gas problems to me, so I cleaned the fuel line from the carbs back to the fuel pump, including taking the top off the pump and checked that as per a recent problem on the Moss forum. Checked to make sure the fuel pump was working, and checked the spark and gap on the points. All that was O.K. so I thought maybe I got some condensation in the tank sitting outside like that. Nope. After the HEET, she turned over right away, ran perfectly at an 800 idle for several minutes, and reved right up to 3000 when I goosed her a little bit. Backed out of the driveway and started down the street for a test drive thinking the HEET had done it, and didn't even make it half a block. Barely got it home again. Must be the carbs, huh? But I haven't had a chance to get back to it again yet.

Fred
 
IF (Big IF) you still think it's condensate I would be more likely to look at crud from the tank jammin up a fuel filter, line or jet.
Have you had your tank out, flushed and re coated?
How cold is it there right now? Zero Fahrenheit??
If you did have water in your gas and you freeze the line you will actually get an ice cube (cylinder) in the line that will block all if not most of the flow until the methyl evaporates it or it thaws out.
Could this be a choke issue as listed here:
https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/395230#Post395230
 
have you checked inside the dist.cap for moisture when she starts to run rough? might be worth a look see.
 
Could be something with the choke, I'll look at that next. The more I think about it, everytime this has happened the car started fine, idled well for a bit, and then went nuts when I started driving it. I think whatever it is only happens after the engine warms up just a little. Does that trigger anything for anybody? Hasn't been particulary cold weather here, always in the 50-65 degree range when this has happened.

Fred
 
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