Your RV Inspector Says:
"Lock Your Fuel Doors."
Certified RV Inspector Bill “Cosmo” Walking recommends The RV Fuel Vault — the only purpose-built locking fuel door for RVs.
Use code COSMO and save $10 per door
Why a Certified RV Inspector Recommends This
After inspecting hundreds of RVs, Cosmo has seen it all — fuel theft, contamination, road damage. The RV Fuel Vault is the only product he's found that truly solves the problem.
Fuel Theft Protection
A tamper-resistant keyed lock stops siphoning and vandalism. No more worrying about your fuel at campgrounds or storage.
Contamination Defense
Seals your entire filler neck area against water, road grime, sugar, and contaminants that cause expensive repairs.
Factory-Finished Look
Covers that ugly exposed fuel cap with a clean, professional finish. The part the factory forgot.
8–15 Minute Install
No drilling, no cutting, no body mods. Bolts on over your existing filler neck with basic hand tools.
Lifetime Warranty
High-strength UV-resistant polymer built to last. Backed by a Limited Lifetime Warranty.
Free Shipping
Ships from our Missouri facility. Free standard shipping on every order. Made in the USA.
See the Difference
Every RV inspector sees this: exposed, unprotected fuel caps. The RV Fuel Vault changes that.
❌ Before — Exposed & Vulnerable
✅ After — Locked & Protected
Fits Your RV — Whatever You Drive or Tow
The RV Fuel Vault works across every major RV type. Use the fitment finder to confirm your exact model.
Class A Motorhomes
Ford F53, Workhorse chassis & more
Class B Campervans
Ram ProMaster, Ford Transit & more
Class C Motorhomes
Ford E-350/E-450, F-550/F-600 & more
Toy Haulers
Fuel cap protection for your hauler
Travel Trailers
DEF & fuel cap protection for your tow vehicle
Fifth Wheels
Protect the truck that pulls your 5th wheel
Inspector's Exclusive: $10 Off Per Door
Use code COSMO at checkout — or just order through this page and it's applied automatically.
Free shipping • 30-day satisfaction guarantee • Limited Lifetime Warranty
A note from your inspector:
“I've inspected hundreds of RVs and the one thing I see on almost every single one is an exposed, unprotected fuel cap. It's a security risk, a contamination risk, and it looks terrible. The RV Fuel Vault is the only real solution I've found — and I recommend it to every client.”
— Bill “Cosmo” Walking, Certified RV Inspector