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Ford 9N, 2N & 8N Discussion Forum
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boiling gas

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518n-AL

05-23-2005 07:47:07




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last winter i installed a thermostat in my 51 8n. i had not been using one since it was overhauled. now that warm weather has arrived here in the south i was mowing the other day for a few hours and when i shut i discovered the gas in the tank was boiling. don't know if the added temp. from the thermostat would do that or not. has anyone else had this problem? and what can be done about it. thanks for any ideas. pk

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BillM (OH)

05-23-2005 19:21:13




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 07:47:07  
My old Bessie will occasionally boil gas when the weather gets really hot, I'm working her hard and when the gas gets low in the tank. If I start with a full tank, it generally doesn't boil. I wash out the radiator fins every so often and it helps. Otherwise, I don't worry about it. I don't know if the vent's plugged or if it's too small to vent the pressure fast enough, but it does build some pressure when boiling and that does concern me. Next move is to drill a vent hole in the gas cap if it happens very often. Most on this board like to work on their tractors -- I don't -- I need my tractor to work -- not be worked on!

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Dan Hill

05-25-2005 04:05:38




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 Re: boiling gas in reply to BillM (OH), 05-23-2005 19:21:13  
Ford has been supplying a vented cap for a long time.There is a vent in the tank up under the hood.This often plugs up with dirt.



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Rob

05-23-2005 09:02:38




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 07:47:07  
Clean out the radiator fins might help. Water or air or both to clean out all the weed and grass seeds.
Maybe you"re running the fuel mix too lean to make a real hot exhaust. Put it in 4thgear, get it rolling forward some, and goose the throttle to 1/2 while you apply some brake and see if the engine takes up without hesitation or stumble. You want a real load on the engine. You should hear a spark knock.
Back out the main jet 1/4-turn at a time until she picks up smooth while loaded by the brake. You get there but then see a puff of smoke when you goose it unloaded then turn the main back in 1/8-turn should clear that up and you"ll be set right and it won"t run hot.

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Barry8N

05-23-2005 08:28:11




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 07:47:07  
You can try putting a piece of insulating material between the tank and engine. Also check and see that your tank is venting since boiling usually happens with heat and pressure.



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Gaspump

05-23-2005 08:19:14




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 07:47:07  
Used to happen all the time to me on my 2N here in FL. Simple solution to that one was simply retarding the timing slightly, made it run a little cooler and prevented gas boiling and vapor lock. I always run a thermostat in my N's too, if temp is higher than that it is working too hard (not likely) or cooling system may be impeded. Might try checking the cooling system for circulation and cleanliness, if the cooling is fine my try retarding a little on the 51, also insulating the fuel line may help.

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Ron Wildman

05-23-2005 09:00:05




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 Re: boiling gas in reply to Gaspump, 05-23-2005 08:19:14  
I put a 6 blade fan on my 8n here is South Alabama and it runs cooler.



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518n-AL

05-23-2005 10:34:53




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 Re: boiling gas in reply to Ron Wildman, 05-23-2005 09:00:05  
radiator is clean-am also running a 6 blade fan-engine starts at first bump of the starter and runs smooth and has plenty of power. may try the idea of a heat shield between engine and tank. i also got to wondering if the gas made now might have a lower boiling point?



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Gaspump

05-23-2005 11:36:52




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 10:34:53  
Todays gasoline have a much lower boiling point than in the "N" era. However, all my N's and my 960 run well in hot weather with today's gas. I usually have some bubbling especially just after shutdown but not of a detrimental nature. I would suggest making sure the tank vent works!



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518n-AL

05-23-2005 13:42:44




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 Re: boiling gas in reply to Gaspump, 05-23-2005 11:36:52  
you may have a good idea about the vent being plugged as there was quite a bit of pressure in the when i removed the gas cap.i hate the thought of removing the hood and dropping the gas tank to get at that pin hole for a two second fix.



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Russ SoCal

05-23-2005 17:35:46




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 13:42:44  
pk,
Remember there are two vent holes. One in the flat top of the tank before that little dome thingy gets stuck on. And the hole you see in the little dome thingy.
Russ



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Gaspump

05-23-2005 14:12:55




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 Re: boiling gas in reply to 518n-AL, 05-23-2005 13:42:44  
Actually you may not have to go that route. Years ago when it was still Ford/New Holland or even before that, new vented gas caps were offered just to alleviate possible suits from plugged "N" tractor tank vents. They were free, one to each N. They may still do that, as they were still doing it a couple of years ago. Call your NH dealer and ask. The cap is pretty complicated (and costly) with anti-slosh chamber and positive venting to fit the N's tank. If you must, dropping the tank is not that hard but it's nice to have a helper to lift the cumbersome hood and tank.

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518n-AL

05-23-2005 17:46:17




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 Re: boiling gas in reply to Gaspump, 05-23-2005 14:12:55  
thanks gaspump the vented cap sounds like a good idea. i'll give the NH dealer a call. pk



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