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FUEL SYSTEM O-RING KIT for FORD PSD 1998-2003 7.3L. TRUCKS ONLY NOT VANS. This Kit is o-rings only for the above vehicle, also see: The Fuel line Grommet Kit for this vehicle The Combo Kit (rings & grommets) for this vehicle O-RING / FUEL LINE GROMMET FAILURE SYMPTOMS: Fuel Puddles in Engine Valley Fuel Dripping Under Bell Housing Un-burned Fuel Odors in Cab CAUSES: The 1998 thru 2003 Ford 7.3L Powerstrokes did not have fuel system o-rings that were compatible with Ultra Low Sulfur Diesel or even low concentrations of Bio-Diesel. The actual life of the o-rings varies greatly and many may not have started to leak yet. These new kits have Brown colored o-rings made of Viton which is resistant to ULSD and Bio Diesel. We purchase all of our Viton o-rings in a Brown color so that we can quickly know that we are shipping the correct ones. This is for your added protection.