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Southern Pa. | Had a 6410 do the exact same thing back in the day. Unscrew the cap, and it would hiss like a bicycle tire going flat. You could try a new supply pump, but, IIRC, I think the Deere dealer told me the injection pump could cause this problem. Could be wrong, it's been awhile. Noticed one poster mentioned his 6430 was doing it as well, which in this case would be the supply pump.
FWIW. | |
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6410 fuel issues
