MF Industrial 20 quitting after about 30 minutes or so of use

[burkeman]

I have a 1969 MF industrial 20 with a Perkins AG3-152 gasoline engine for which I have had for years. Lately, the tractor runs great for about 30 minutes to an hour or so of continuous use, then it starts to die. It seems to run somewhat if I use the choke but will die if the choke is not used. If I use the choke for a few minutes then stop using the choke it will run fine for a little while and then the problem repeats. Also, if I stop and let it sit for about an hour or so, the problem goes away until again, 30 minutes or so later of use. I replaced the coil, and check the fuel lines and the filter at the carb. Nothing found. Still have problem. Any other suggestions? Thanks.

Jim

 

[Zork]

Check the vent in your gas cap. The tank may be building a vacuum in that time; enough to stop your fuel flow.

 

[Jerry/MT]

I have a 1969 MF industrial 20 with a Perkins AG3-152 gasoline engine for which I have had for years. Lately, the tractor runs great for about 30 minutes to an hour or so of continuous use, then it starts to die. It seems to run somewhat if I use the choke but will die if the choke is not used. If I use the choke for a few minutes then stop using the choke it will run fine for a little while and then the problem repeats. Also, if I stop and let it sit for about an hour or so, the problem goes away until again, 30 minutes or so later of use. I replaced the coil, and check the fuel lines and the filter at the carb. Nothing found. Still have problem. Any other suggestions? Thanks.

Jim

Run the tractor til it stops then immediately get off and check the spark. If it's non-existent or weak, feel the coil. If it's hot , then check and make sure that you have the correct coil. If you have the requites strong spark (FAT AND BLUISH-WHITE, the color of lightning).
If you have a good spark, then check to make sur e you're getting adequate fuel to the carb. If not, you could have a clogged strainer in the tank, a bad fuel filter, a a blocked or kinked fuel line, a plugged fuel vent or a blockage at the carb float valve, etc.