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fuel boiling

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the cat

02-02-2006 20:19:21




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have just fully recondition motor on grey fergy and now up and running like a gem ,the trouble i have now is fuel boiling in tank hoping someone out there might be able to help (timing is right)




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Leland

02-04-2006 17:37:29




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
you should not really operate this until you fix this problem , , more than 1 person has been killed or severely injuried by exploding tanks on several older models and DO NOT remove the fuel cap until it has cooled bacause you could be a fire ball from spraying gas . you need a sheild and probley a vented gas cap would help .



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Jerry/MT

02-03-2006 10:44:05




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
I have a Ferguson TO-30 and our summers here in Western Montana get into the 90's, we are at 3300 feet altitude, and I have never seen this kind of problem and I have never seen a heat shield on a Ferguson. Make sure that you ignition timing is correct and that your mixture is not too lean. (Too lean a mixture and too retarded a spark can cause the exhaust manifold (and the exhaust valves) to run really hot.) Make sure there is at least an inch of separation between your fuel line to the carb and the exhaust manifold. If it continues, insulate the fuel line and build a heat shield if you see signs of boiling in the fuel tank. And do it NOW, cuz it's a real safety hazard!

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the cat

02-10-2006 02:06:00




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 Re: fuel boiling in reply to Jerry/MT, 02-03-2006 10:44:05  
Hey Jerry, right on the money mate. Contrary to everything being right and running well, starting well, you would imagine that the timing would be right. I set the motor timing at top dead centre. With my information, i'm not sure at what degree it fires before top dead centre. Do you know? I can't find this info.

Consequently i have advanced my spark and am getting great results (fuel not boiling). Still yet to try in paddock under load and hope it doesn't ping. Could be a bit of mucking around but we'll get there. The cat.

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the cat

02-03-2006 02:03:59




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
I would really like to thank everyone for their input. Thanks guys. Will look into all aspects of your suggestions. Not sure if you"ve worked out that i"m from Australia (climate). The tractor in my time has never had a heat shield and i"ve never had this problem before. Everything has been done motor wise, dissi,all cooling etc,etc.

This motor is now using ULP (premium) - not sure about octanes but don"t believe this is the problem. I do have cowl around fan but do not have the bonnet on yet. Also have new muffler with a spark arrester about 1/3 down from the top. Any further suggestions??? Would be appreciated.

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Bob

02-02-2006 21:19:38




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
If you are in an area of the country that has "winter gas", that will make the problem worse.



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old

02-02-2006 21:04:10




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
Sounds like the heat sheild was removed at one time. Yep they had heat sheilds on most of those old tractors because of that problem. All it was is a piece of metal about 1/4-1/2 inch below the gas tank that would sheild the heat from the engine and sort of push it to the side.



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Ol Chief

02-02-2006 20:58:33




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
I have seen this this problem a few times on Fords.Most on N series.Bubbles will show in the filter bowl and then vapor bind at the carburator.My neahbors had had their tractors to various agencies,none of whom had seen this problem under field operating conditions.This was years ago before asbesios was ruled out.I cured the problem each time with a single sheet of 1/16 " asbestos paper attached to the bottom of the gas tank.There are now other insulating products available,but I have no idea what may be available.I would not suggest fiberglass house type material but there are industrial types to use. Maybe a webb search can point you in the right direction.If you can locate some fiberglass cloth such as used in boat or body repairs that may work.Good Luck.

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msb

02-02-2006 20:56:50




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 Re: fuel boiling in reply to the cat , 02-02-2006 20:19:21  
Not A fergy fan but sounds like you need to make a heat shield for the underside of the gas tank.You'll need an air gap between the shield and the tank and a way for the heat between the two to escape either from the fan blast or upwards.



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