Auto Repairing 2005-2008 Ford F-250, F-350 Slow Fuel Fill—Mil On With Dtc P0191
Issue some 2005-2008 f-super duty 250/350 vehicles equipped with a 5.4l 3v or 6.8l 3v engine may experience premature automatic shut off of the fuel fill nozzle, or repeated fuel shut off at the fuel station delivery nozzle with malfunction indicator lamp (mil) on with diagnostic trouble code (dtc) p0191. Vehicles operated in muddy or dusty environments can encounter a dirt clogged carbon canister system. More specifically, the carbon canister’s vent, fresh air box, and filters become clogged with dirt from operating in such environments. Action use the following service procedure to resolve the concern if the carboncanister system is dirt clogged. Note this tsb only applies to f-250/350 pickups, and f-250/350 pickup box delete/chassis cab vehicles service procedure inspect the vehicle canister system and if it found to be dirt clogged then continue with this tsb. Note if the vehicle’s canister system is not dirt clogged, then proceed with normal diagnostics and do not continue with this tsb. Vehicles with pickup boxes: 1. Replace the carbon canister assembly with a canister built after 10/1/2006.
This canister has a revised internal filter media, and went into production on 10/1/2006. The date code is on a black sticker located on the carbon canister assembly. 2. Relocate the fresh-air intake port to a more protected location using the fresh air hose kit, for pickup applications only. 3. Replace fuel cap assembly if the vehicle was built before 5/16/2007. Vehicles with pickup box removed or chassis cab: 1. Replace the carbon canister assembly with a canister built after 10/1/2006. Thiscanister has a revised internal filter media, and went into production on 10/1/2006. The date code is on a black sticker located on the carbon canister assembly. 2. Relocate the fresh-air intake port to a more protected location using qvm bulletin q-132 at the body builder’s website – https://www.Fleet.Ford.Com/truckbbas/index.Htm for fresh air intake routing recommendations. 3. Replace fuel cap assembly if the vehicle was built before 5/16/2007.
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