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In Reply to: Diesel 4020 problems posted by John Paul on Sunday, February 24, 2008:
THEY IS A CHECK VALVE ON THE SIDE OF THE PUMP IT LOOKS LIKE A 90 ELBOW IT STOPS UP WITH LITTLE PIECES OF THE SEALS OUT OF THE PUMP I JUST KNOCK THE CHECK VALVE OUT AND CLEAN IT OUT WILL RUN FINE AFTER THAT. P.S. THE SEALS IN YOUR PUMP ARE GOING OUT PUT WILL WORK FOR A LONG TIME.THE LINE THAT HOOKS TO THE 90 IS THE RETURN LINE