Fixing the fuel water separator check engine light on a 2004 F250 6.0 Super Duty diesel by cleaning out the fuelwater separator & changing out the fuel filter.\rbr\rbrSee how Cars.com Service & Repair can help you find the cost of parts and labor so you can #IgnoreNoMore. Fixing the fuel water separator check engine light .\rbr\rbrSee how Cars.com Service & Repair can help you find the cost of parts and labor so you can #IgnoreNoMore. See how Cars.com Service & Repair can help you .\rbr\rbrFixing the fuel water separator check engine light on a 2004 F250 6.0 Super Duty diesel by cleaning out the fuelwater separator & changing out the fuel filter.