I got a fuel filter made by gunn I changed to o rings on the valve the ones on the valve was blue and black the ones with the filter was both black is there on diffrence between the 2 colors or are thay the same coz now it leaks and one side do the valve don't seat right

Fit a filter made by either Mann & Hummel or Bosch. These come with the correct blue and black "O" rings. Fit the rings without twisting and lubricate them lightly with engine oil before fitting them to the filter bore. Only when fully seated, fit the mickey mouse clip. Prime the new filter with a vac pump on the filter outlet.

 

Cheap spares don't work on these engines.

 

rotodiesel.