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Reseal or replace the valve.
There are many reasons why a Massey Ferguson 50 won't drive, including a lack of fuel, or a battery problem.
a hole in one of the pistons
the diaphram in the fuel lift pump goes bad and leaks fuel into the engine
Some pos problems include leaking fuel injectors leaks ,fuel pump leaking main injector pump and crack cly sleave
it's under the black mesh screen between your feet as your sitting on the machine. you have to remove the gray plastic from the dash to the floor 6 screws per side
the 255 i just repaired had a push rod adjuster loosen up causing the valve not to open The valve was not opening so no air movement you can loosen the primary fuel lines at pump to see which cly may have a problem
Drain the fuel tank, and replace fuel filter.Drain the fuel tank, and replace fuel filter.
Did you replace the fuel filter?Did you replace the fuel filter?
You can't replace the fuel filter.
It is highly recommended.
You will have to drop the fuel tank to replace it.