What motorhomes does the RV Fuel Vault fit?

The RV Fuel Vault fits Super C motorhomes on Ford F-550/F-600 diesel chassis AND Class C motorhomes on the Ford E-450 gas chassis. Super C brands: Entegra Coach Accolade XT & Esteem XL, Jayco Seneca XT, Grand Design Lineage Series F, Dynamax Isata 6, Holiday Rambler Incline FS600D, East to West RV Bravado, Fleetwood RV Altitude 600D, and Thor Four Winds Chateau Diesel. E-450 Class C brands: Nexus RV Viper, Jayco Redhawk SE, Thor Four Winds & Chateau, Winnebago Minnie Winnie & Spirit, Coachmen Leprechaun, Forest River Forester LE, Phoenix USA Cruiser, and Coach House Platinum IV.

Why do Super C motorhomes have exposed fuel caps?

Super C motorhomes are built on commercial Ford F-550 and F-600 truck chassis, which were designed for commercial applications where fuel cap security wasn't a priority. When RV manufacturers build motorhomes on these chassis, the diesel fuel caps remain exposed and unprotected on the exterior of the vehicle — making them vulnerable to theft, siphoning, contamination, and vandalism. The RV Fuel Vault was invented specifically to solve this problem.

How much does the RV Fuel Vault cost?

The RV Fuel Vault is available in three packages: Single Door at $99.95 retail ($84.95 pre-order), Set of 2 at $199.95 retail ($149.95 pre-order), or 3-Pack (includes DEF tank cover) at $299.95 retail ($224.95 pre-order). Free shipping in the Continental United States. All packages include a 24-month manufacturer warranty.

Is the RV Fuel Vault easy to install?

Yes! The RV Fuel Vault features a simple bolt-on installation that requires zero modifications to your motorhome. Using only basic hand tools (wrench or socket set), most owners complete the install in 8–15 minutes. Detailed instructions with photos are included, plus a step-by-step video guide is available at rvfuelvault.com/installation.

What warranty does the RV Fuel Vault come with?

Every RV Fuel Vault set comes with a 24-month manufacturer warranty covering defects in materials and workmanship. If anything goes wrong within the warranty period, we'll replace it at no cost to you.

Does the RV Fuel Vault prevent fuel siphoning?

Yes. The RV Fuel Vault completely covers and locks over your fuel caps, making it physically impossible to insert a siphon hose or tamper with the fuel cap. The tamper-resistant keyed lock design provides full anti-siphon protection for your diesel fuel — giving you peace of mind at campgrounds, truck stops, and overnight parking.

What is the best diesel fuel cap cover for an RV?

The RV Fuel Vault is the first and only diesel fuel cap cover designed specifically for RV motorhomes built on the Ford F-550 and F-600 Super C chassis. Unlike generic aftermarket caps, this purpose-built diesel fuel cap cover for RV use features a heavy-duty steel construction, tamper-resistant keyed lock, and bolt-on installation with zero modifications. It is patent pending (19/632,042), made in the USA, and comes with a 24-month warranty.

Can I still fuel my RV with the RV Fuel Vault installed?

Absolutely. Simply unlock the cover with your key, lift it open, and fuel as normal. The cover stays attached to your RV at all times — no parts to lose or misplace at the fuel station. Lock it back up when you're done and you're back on the road.

Is the RV Fuel Vault made in the USA?

Yes! The RV Fuel Vault is proudly designed and manufactured in the United States. We're a family-owned business of RV enthusiasts who created this product because we personally experienced the vulnerability of exposed fuel caps on our own Super C motorhomes.

Is the RV Fuel Vault patented?

The RV Fuel Vault is Patent Pending under U.S. Patent Application 19/632,042. It is the first product of its kind — specifically engineered to protect the exposed diesel fuel caps found on Ford F-550 and F-600 Super C motorhome chassis.

Can RV dealers or manufacturers become distributors?

Yes! We welcome partnerships with RV dealers, service centers, and manufacturers. The RV Fuel Vault is an excellent aftermarket add-on or factory option for Super C motorhomes. Contact us at 1-941-393-1493 or through our website to discuss dealer pricing and OEM partnership opportunities.

How does the RV Fuel Vault protect against fuel contamination?

The RV Fuel Vault creates a sealed, locked barrier over your fuel cap, preventing anyone from introducing water, sugar, dirt, or other contaminants into your diesel fuel system. Even a small amount of contamination can cause thousands of dollars in engine damage — the Fuel Vault eliminates this risk entirely.

Is the RV Fuel Vault the same as a fuel tank hatch or fuel neck cover?

The RV Fuel Vault serves a similar purpose to fuel tank hatches and fuel neck covers but is purpose-built specifically for Ford F-550 and F-600 Super C motorhomes. Unlike generic fuel tank hatch covers or universal fuel neck covers sold at RV parts retailers, The RV Fuel Vault is precision-engineered to fit the unique exposed dual diesel fuel cap configuration found on Super C chassis. It combines the security of a locking fuel door with the heavy-duty protection that motorhome owners need.

How does the RV Fuel Vault compare to chrome fuel doors or aftermarket fuel door covers?

Chrome fuel doors and generic fuel door covers are typically designed for trucks and cars — not for the exposed dual diesel fuel caps on Super C motorhomes. The RV Fuel Vault is the first product specifically engineered for this application. It features heavy-duty steel construction (not decorative chrome), a tamper-resistant keyed lock, and a bolt-on design that requires zero modifications. It provides real security against fuel theft and siphoning, unlike cosmetic fuel filler doors.

What is an RV fuel cap cover and why do I need one?

An RV fuel cap cover (also called an RV fuel hatch cover, gas cap hatch, or fuel cap hatch cover) is a security device that covers and locks over the exposed diesel fuel caps on your motorhome. Super C motorhomes on Ford F-550/F-600 chassis have fuel caps that are completely exposed and accessible to anyone. The RV Fuel Vault is the first RV fuel cap cover purpose-built for these vehicles, featuring heavy-duty steel and a tamper-resistant lock to prevent fuel theft, siphoning, contamination, and vandalism.

What is an RV gas cap hatch and where can I buy one?

An RV gas cap hatch (sometimes called a fuel hatch, fuel cap hatch, or fuel door) covers the fuel filler area on your motorhome. The RV Fuel Vault is the only RV gas cap hatch cover designed specifically for Super C motorhomes. You can pre-order directly from thervfuelvault.com — available as a Single Door ($84.95), Set of 2 ($149.95), or 3-Pack with DEF tank cover ($224.95). Made in the USA with free shipping.

Is there a locking fuel hatch cover for Ford F-550 and F-600 motorhomes?

Yes — The RV Fuel Vault is the first and only locking fuel hatch cover specifically engineered for Super C motorhomes built on Ford F-550 and F-600 chassis. Unlike universal gas cap covers or generic fuel hatches from auto parts stores, our fuel hatch cover is precision-built to fit the exposed dual diesel fuel cap configuration on these vehicles. Bolt-on installation in 8–15 minutes, no modifications required.

Does the RV Fuel Vault fit Ford E-450 Class C motorhomes?

Yes! The RV Fuel Vault now fits Class C motorhomes built on the Ford E-450 gas chassis. Compatible E-450 models include the Nexus RV Viper, Jayco Redhawk SE, Thor Four Winds & Chateau, Winnebago Minnie Winnie & Spirit, Coachmen Leprechaun, Forest River Forester LE, Phoenix USA Cruiser, and Coach House Platinum IV. If your Class C has an exposed fuel or gas cap, The RV Fuel Vault will protect it.

Does the RV Fuel Vault work with gas fuel caps or only diesel?

The RV Fuel Vault works with both diesel and gas fuel caps. It was originally designed for diesel fuel caps on Ford F-550/F-600 Super C chassis and has expanded to cover gas fuel caps on Ford E-450 Class C chassis. The product covers and locks over the exposed fuel cap area regardless of fuel type.

Fuel Cap Security for Your Nexus RV Viper

Purpose-built for the Nexus Viper Class C on Ford E-450 chassis

The RV Fuel Vault — RV fuel cap cover, fuel hatch cover and gas cap hatch for Super C and Class C motorhomes

The Problem

✖Your Nexus Viper has exposed gas caps with zero security
✖Generic locking gas caps don’t fit the E-450 filler neck properly
✖Fuel theft and contamination are real risks at campgrounds and overnight stops
✖No factory fuel cap security exists for Nexus RV models

The Solution

Engineered specifically for Nexus RV Viper on Ford E-450 chassis
Heavy-duty steel with tamper-resistant keyed lock
Bolt-on install in 8–15 minutes — no modifications needed
Made in USA with 24-month warranty and free shipping

Pre-Order Today — Starting at $84.95

Single Door, Set of 2, or 3-Pack · Free shipping · 24-month warranty · 30-day guarantee

Pre-Order Now

Proudly Made in the USA · Patent Pending 19/632,042