Water in fuel on 2006 Ford F-350 Super Duty

A light on the dash board keeps popping up saying there is water in fuel. I put 2 bottles of Iso-heet in the tank and it still says water in fuel. Is there some type of cap or plug on the bottom of the gas tank where i can empty and flush the tank out?

Asked by for the 2006 Ford F-350 Super Duty
2 answers
change the fuel filter and clean it out and out fresh fuel in the new one. no matter what additive you add, it will not take away the water the filter has trapped.

Roy

FUEL CONDITIONING MODULE

Fuel Line Disconnect Tool






Special Tool(S)

Removal and Installation


With the vehicle in NEUTRAL, position it on a hoist.
WARNING: Smoking or open flame of any type must not be present when working near fuel or fuel vapor.
Disconnect both battery ground cables.









Open the fuel/water separator drain valve to release the fuel pressure.








Disconnect the electrical connectors.
Disconnect the fuel pump electrical connector.
Disconnect the water-in-fuel electrical connector.








Disconnect the fuel hoses.
1 Remove the fuel hose retaining clips and discard. Disconnect the fuel hoses from the fuel pump.
2 Press in the retaining clips and release the fuel hoses.









Remove the mounting nuts and the fuel conditioning module.
To install, tighten to 15 Nm (11 lb-ft) .
To install, reverse the removal procedure.

sorry, I thought it was one unit but it is part of the filter assembly.

Roy
To add to Roy, there is a TSB (technical service bulletin) - 06-22-12 that speaks about the water in fuel light coming on, even flickering. It calls for a reprogramming of the processors, and a check of the water in fuel sensor in the housing assembly for signs of sediment and corrosion. If corrosion is present, the sensor gets replaced too.

This repair MAY be covered by the 5 year / 100,000 mile Diesel warranty - would be worth consulting a dealership for to maybe save you some money and effort.

Good luck!