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JD 6420 Fuel System

DL Centurelli
Problem with fuel system over pressurizing
Local repair shop is playing parts chaser and can't resolve anything. Sometimes the unit will run for 3 mins and just shut off, when trying to resart it it acts like it is starved for fuel. Fuel tank pressurizes so much you can't remove the cap- Any thoughts or simular problems

AL my 6420 does the same thing . the electric fuel pump on the inside of the frame is not working. try giving it a wack it shoud buz whith the key on, or may need to be replaced ?

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