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Harry Ferguson Tractors Discussion Forum
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boiling fuel

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4runner

10-15-2006 04:20:42




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I had a scary situation occur yesterday while I was cutting some acerage with my TO-20 and a bushog. I was almost finished going through some thick stuff and I noticed the temp gauge at 200, normally it runs about 170-175. After shutting her down I noticed alot of weed and grass debris falling from the front of the radiator, upon opening the bonnet the front of the radiator was covered(cause for the climbing temp). The scary part was there was a hissing noise from the fuel cap, I slowly opened the cap and discovered a tremendous amount of pressure had built up, after releaving the pressure I looked into the tank and the fuel appeared to be actually boiling! I thought I had a vented fuel cap but it doesn"t appear to be working. The engine starts fine but there is that smell of things that had gotting alittle warmer than intended. I"m planning to change oil. The engine was rebuilt in May and has been working without a problem. I am getting some fuel seepage/weep from the fuel bowl and the carborator. Any ideas or suggestions?

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NEsota

10-17-2006 12:27:02




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 Re: boiling fuel in reply to 4runner, 10-15-2006 04:20:42  
Several times fuel in my 8N tank has boiled under the same circumstances you describe. No repair action was required. One thing that might help to prevent a reoccurrence is to fasten a layer of fly or window screen over the outside of the grill, before doing this kind of work. With the fan running slowly or stopped it is easy to brush off the debris that collects on the screen before it gets into the radiator and shuts off the air flow.

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Jeff-oh

10-16-2006 06:21:48




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 Re: boiling fuel in reply to 4runner, 10-15-2006 04:20:42  
I also had this happen a few years ago. I had never cleaned the radiator off and all the air passages between the tubes were clogged with grass chaffe. I used compressed air and cleaned the radiator. I do not see the need to remove the radiator to do this job.

Clean often (Before, after and as needed while mowing) and you should fine. As a help a finer screen can be put over the grill. use either a window screen or the pre made "Ferguson System" made for this purpose.

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John (UK)

10-15-2006 11:23:48




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 Re: boiling fuel in reply to 4runner, 10-15-2006 04:20:42  
Wash out the radiator core from the fan side, make sure to go in all the corners and the centre. Use a flashlight on the engine side and look from the front to see if it is totally clear. Ideally remove the radiator to do this but you can manage with it still on the tractor. This is something that should be cleaned regularly, not just occasionally. You will be surprised at how much rubbish will come out of that Radiator. Make sure that tank cap isn't blocked or restricted at the breather hole. In some export markets a shield for fitting under the tank was available, it attached to the studs that secure the Valve Cover and covered the top of the manifold so the heat would not rise, it must not touch the manifold or it will transfer the heat and also it may vibrate and cause a noise, it was only made from thin sheet steel.

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daveywavey

10-15-2006 06:18:11




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 Re: boiling fuel in reply to 4runner, 10-15-2006 04:20:42  
Thats pretty scary, but I dont think it was at the point of explosion...lol Any liquid has a boiling point, 210-220 or so. I also think that your vented gas cap might be just fine, it just couldnt handle the gobs and gobs of pressure that was being released all at once by the fuel boiling. As soon as your cap could vent a few pounds of pressure, your tank had already built up 10-20 more...lol. I imagine the fuel being under pressure probably ruined your needle valve in the carb, its a little rubber tipped needle that opens and closes the fuel flow as the float moves up and down. The needle can hold back some pressure, but not that much...lol. Probably need a basic rebuild kit for carb, $15 on this site. Gotta watch the radiator getting clogged up when mowing, it can do some damage. Well, other than changing oil and doing some carb work I imagine your ok. Its good you were watchful and caught it at 200, rather than at boil over...lol

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