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TO30 boiling gasoline!

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Chad, Kansas

04-06-2001 09:40:59




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I bought my TO30 last Sunday. After changing plugs, wires and fuel, it's running well. I ran it last night for 2 hours, and after shutting it off, the gas was boiling in the tank. Scary. I suspect the cap isn't venting properly, but I'm surprised and concerned. Does anybody have any ideas or previous experience with this?




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ErnieD

04-10-2001 04:18:49




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
Did you have more fuel the second time? And fresh gas versus winter fuel? Winter fuel vaporizes more easily and a fuller tank will absorb more heat.

Don't confuse boiling point with autoignition temp, which is much higher.



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Chad, KS --- follow up to all

04-09-2001 17:10:30




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
The problem was fixed by blowing out the radiator to get better cooling. The day the gas boiled, the weather was in the high 50's. I ran the tractor for 6 hrs yesterday pulling an 8' box blade in 80 degree weather and the gas stayed cool. Good sell for basic maintenance. Now I'm on to the gummed up carb and the leaking oil gage...

Yes, the gas actually bubbled like a pot on the stove. The first sounds I noticed were the pop, pop and hiss coming from the tank. After several careful twists on the cap, I looked in to see the gas bubbling and simmering. I'll be keeping the radiator clear...

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Tom in Mo.

04-07-2001 19:15:47




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
My 30 will overheat if the coolant isn't kept fairly full to the top of the radiator. Also have to keep the grass and leaves off the radiator as it pulls a lot of air. I have never had it hot enough to boil gas in the tank tho.
Make sure your fan shroud is intact for fan suction and check belt tension as it drives the fan and the pump.



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Ray,IN

04-06-2001 21:05:18




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
This is not normal. Gas percolating in the tank is unnerving. The tank will not rupture if the vented cap is working. The gas will not ignite inside the tank, the vapor/air ratio is too rich. Like one of the guys said, make sure something is'nt restricting air flow around the tank. You might check how hot the coolant temp. is when you hear the percolating. Could be the engine is overheating. If you are fearless use your wifes candy thermometer to obtain the coolant temp. The dash gauge is just a indicator of operating range, and may not be accurate. Thats my thoughts.

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Chad, Kansas

04-06-2001 21:01:11




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
I think I've got it fixed. My temperature gage is rusted out. A local mechanic suspected bad cooling and told me to blast out the radiator with compressed air (back to front.) I was surprised at the amount of dry grassy stuff that came out that I didn't see before. After running the tractor again it seems to run cooler and the gas did not boil.

The scary thing about the boiling gas was that I didn't know about it until I shut it off. Some replies said this was common, but I'm glad to have it stopped for now. Thanks for the replies. marlowe, Let us know if you remeber the right term for this...

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Jim

04-06-2001 17:28:05




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
Gas should ignite before it boils, even inside a tank! I have a TO-30 and the Gas DOES NOT boil in my tank. However some previous owner has removed the gas tank cap gasket (or it has rotted and fallen off). Something is fishey here, the gastank sets right over the top of the valve cover, and is also very, very close to the exhaust manifold. Do you have buildup between the bottom of your gastank and the top of your valve cover preventing airflow/cooling. Has your gastank been lowered maybe due to the front Battery tray rotting out possibly letting the fueltank lay down closer to the exhaust manifold. Let us know.

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SandyB@TN

04-06-2001 16:09:23




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 Re: TO30 boiling gasoline! in reply to Chad, Kansas, 04-06-2001 09:40:59  
Chad,
I have a TO-20 that does exactly the same thing. I'm presuming it's just the nature of the beast. The Fergie uses a vented cap. The 8N just has a hole in the top of the tank. The boiling has never given me any problem and I know that some others have the same situation. At this point, I'm figuring it's just normal and I don't worry about it anymore. Maybe somebody else has some thoughts on this phenomenon.
Sandy

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marlowe

04-06-2001 18:07:18




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 Re: Re: TO30 boiling gasoline! in reply to SandyB@TN, 04-06-2001 16:09:23  
mines been doing it since 1949 the gas don"t really boil it has a differnt name but can not recall it



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Frank H. Biscardi

04-06-2001 18:06:56




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 Re: Re: TO30 boiling gasoline! in reply to SandyB@TN, 04-06-2001 16:09:23  
I will be doing some plowing with the TO-20 tommorrow. I will look to see if she boils also-I sure hope it doesnt.

Regards

Frank



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Mike

04-08-2001 09:17:05




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 Re: Re: Re: TO30 boiling gasoline! in reply to Frank H. Biscardi, 04-06-2001 18:06:56  
If the gas actually boiled I would be suprised. Are you sure it is boiling and not just vaporising? If the gas is boiling and you are concerned my advice would be to insert a layer of rockwool between the base of the tank and the rocker cover. Does the gas actually bubble inside the tank? Also what sort of climate are you in ,is it exceptionally hot?



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