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6420 Fuel System

David Centurelli The fuel system keeps overpressurizing. It puts so much pressure in the fuel tank that you can remove the cap (like a hot radiator cap) tractor will run for 3 mins then won't start like it's starved for fuel. Dealer has changed out injector pump, filters ect. If the lines arn't tight it will cause fuel to spray. Any Ideas
george I think the vent is plugged for the tank or in the fuel cap. Some are vented in the cap. I had this problem one time.

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