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Massey Harris & Massey Ferguson Tractors Discussion Forum
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bubbles/fuel from top of fuel tank

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rcs

03-17-2008 08:29:01




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I have fuel being pushed out the top of the fuel tank on my MF 35 diesel. This is at the fuel gauge sending assembly. Engine starts and runs. Could the fuel filters be clogged and creating back pressure?




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rcs

03-22-2008 05:47:59




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 Re: bubbles/fuel from top of fuel tank in reply to rcs, 03-17-2008 08:29:01  
No vent hole in the fuel tank cap and the tank is just half full.

Engine still starts and runs fine. Leak doesn't start until the engine has been running for 5-10 minutes. I've tighted the sending unit down and it helped but pressure is still being built up in the tank.



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Finn Md

03-18-2008 14:27:02




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 Re: bubbles/fuel from top of fuel tank in reply to rcs, 03-17-2008 08:29:01  
I used to have similar problem on a 135D when I filled it near full top. Try not filling fuel to the tank top and it may help. The gasket on sending units often don't seal good. Good Luck



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Jerry/MT

03-17-2008 10:19:10




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 Re: bubbles/fuel from top of fuel tank in reply to rcs, 03-17-2008 08:29:01  
There should be a vent hole on the fuel cap and maybe it"s clogged. A clogged filter won"t cause that problem. As the fuel heats up from a warm engine and as bypass fuel is returned to the tank, it expands due to temperature and the ullage air(the air over the top of the fuel) needs to go somewhere. So the cap is usually vented. If the vent gets plugged, the pressure build up and any leak path will try to pass the air.
So check the cap andlook for a hole in it. Some times tanks have a separate vent tube but most often the cap has a vent hole.
Hope this helps.

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