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southern IA | Gas or diesel?
If its gas there is a known problem with the charcoal canisters plugging. Ford issues the TSB listed below on it. Ford even updated the charcoal canister to help with the issue.
https://www.fleet.ford.com/truckbbas/non-html/Q-181.pdf
If its diesel its likely just the routing. Had several diesel superduty trucks from F250-F550 with Knapehide boxes at my previous job. Only time one of them had a problem filling was when the rear spring broke and partially pinched off the fuel fill. The F550s were cab/chassis and had the midship tank. The F250 and F350s were standard frames with the normal 38 gallon tanks. | |
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Pickup with knapheide service body hard to put gas in
