There is a pressure relief valve on top of the tank close to where the hose goes into the tank. It gets dirty & corroded. I have the 2011 6.7 F250. Pressure wash it & move it around with your fingers. Problem solved. I cleaned mine the other day while I had it on a lift. From the back you can see it looking over the rear axel.
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DEF filling problem on 6.7L
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Originally posted by Brett C View PostThere is a pressure relief valve on top of the tank close to where the hose goes into the tank. It gets dirty & corroded. I have the 2011 6.7 F250. Pressure wash it & move it around with your fingers. Problem solved. I cleaned mine the other day while I had it on a lift. From the back you can see it looking over the rear axel.
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