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Massey Harris & Massey Ferguson Tractors Discussion Forum

MF-30 ind. fuel problem

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brian davis

02-05-2006 22:03:56

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The fuel tank on this had silt-like rusty crud half an inch thick, had clogged the filters... removed and cleaned tank, replaced filters, bled, started, etc. Tractor will run a few minutes, then die down and quit, which is exactly what it did before, which led me to discover the crud in the tank. If I let it sit a few minutes it starts up, runs great, then after a few minutes acts like it's starved for fuel again. Checked supply to injector pump, what else do I look for? Thanks!

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jack in nb

02-07-2006 03:48:56

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Re: MF-30 ind. fuel problem in reply to brian davis, 02-05-2006 22:03:56

Have you checked for fuel flow to the fuel pump? Disconnect the line at the fuel pump coming from the shutoff valve on the tank and see if you have a nice steady stream.

I've had the shutoff valve obstructed so only a dribble came through, and this may be your situation, especially with the crud you mentioned in the tank.

Those shutoff valves originally had a screen on the top - yours may still be there and plugged. Replacements are available, but they don't seem to make a lot of difference if left off. The valve itself can be disassembled and cleaned.

As an aside, those fuel lines are solid steel, and a bugger to connect and disconnect. I cut them all (EXCEPT the high pressure lines going up to the injectors!!!) somewhere near the middle and shoved on a piece of flexible neoprene fuel tubing. Makes them a dream to reconnect; no more stripped threads in the fuel pump or filter housings!

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brian davis

02-07-2006 08:52:30

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Re: MF-30 ind. fuel problem in reply to jack in nb, 02-07-2006 03:48:56

Thanks Jack, I did check the fuel supply right where it goes into the inj pump and it's good. Even tried manually pumping with the lever on the fuel pump. I suspect there's something in the inj pump floating around and at some point (the 'after 3 minutes of running point') it sucks into an orifice or something. I know what you mean about the steel lines. As far as the little screen, I cleaned that when I cleaned the tank, it was pretty clogged. That's why I figured cleaning everything would solve the problem. Hate to pull the inj pump but that seems to be my only option. Nothing else left to clean or check! Thanks again.

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