Technical Service Bulletins

Water in Ford diesel

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Water in Ford diesel

Some 1999-2006 Ford F-350, F-450 and F-550 vehicles equipped with the 6.0L or 7.3L diesel engine and a 40-gallon fuel tank behind the rear axle may exhibit water in the fuel tank.

This is due to snow and ice accumulating around the mushroom vent cap, melting and being pulled into the tank through the mushroom cap.

Replace the mushroom cap with a vent line assembly kit. The kit is available as P/N 5C3Z-9S327-A.

  1. Remove the existing mushroom cap installed on the vent port of the fuel tank and discard.
  2. Install the hose end of the new vent line assembly onto the vent port and secure with the PIA constant tension clamp.
  3. Route the new vent line assembly forward, on top of the tank, to the #5 crossmember and under the fuel lines.
  4. Secure the end of the new vent line assembly to the crossmember with the tie strap, at the large circular hole in the middle of the vehicle.
  5. Install the new mushroom cap at the end of the vent line. Be sure that the cap is positioned horizontally to prevent water from collecting on the cap.

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