Ford F-550 / F-600 Super C Fuel Door Replacement
Super C motorhomes on the Ford F-550 and F-600 use the small RV Fuel Vault door. Diesel coaches with two fills and a DEF cap take the 2-Pack or 3-Pack, keyed alike so one key opens every door.
Why a Locking Gas Cap Is Not Enough
- ✖Super C diesel coaches can have two exposed fuel fills plus an exposed DEF cap
- ✖Factory caps and doors on these chassis offer no lock
- ✖A full Super C tank holds a lot of diesel — an easy siphoning target
- ✖DEF contamination can mean an expensive repair
Why a Locking Fuel Door Beats a Locking Gas Cap
- Small door: single, 2-Pack or 3-Pack with DEF — multi-packs are keyed alike
- Gas F-550 coaches typically take one small door with SS100 screws
- Ram 5500 Super C coaches are covered too; some newer coaches use a 2 Small + 1 Round kit
- Bolts over the factory fill using the existing screw holes — no drilling
- Limited Lifetime Warranty and $500 No-Siphon Promise
- Made in the USA
Before & After: Your RV's Exposed Fuel Cap vs. a Locking Fuel Door
How It Installs — 8–15 Minutes, No Drilling, No Cutting
Confirm the coach in Find My Fit to get the right door count
Remove the factory bezel screws at each fill (leave the caps in place)
Align each RV Fuel Vault door with the factory screw holes
Secure with the included security screws — do not over-tighten
Test every lock with both keys
Frequently Asked Questions
Common questions about The RV Fuel Vault on Ford F-550 / F-600 motorhomes
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Single Door, Set of 2, or 3-Pack · Limited Lifetime Warranty · 30-Day Guarantee
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See the part-by-chassis chart, install steps and wholesale options for service shops and mobile RV techs.