What motorhomes does the RV Fuel Vault fit?

The RV Fuel Vault fits all Super C motorhomes built on Ford F-550 and F-600 chassis platforms, including 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 (Super C F550). It works with any motorhome that uses the standard Ford F-550/F-600 exposed fuel cap configuration.

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 retails at $199.95 for a complete set of 2 security fuel cap covers (one for each side of your motorhome). Pre-order now for just $149.95 and save $50! Free shipping is included in the Continental United States. All other locations ship at an additional cost. The product comes with 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.

Security Alert for Super C Motorhome Owners

The $200,000+ Motorhome With
a $0 Fuel Security System

Every Super C motorhome built on a Ford F-550 or F-600 chassis shares the same critical design flaw: two completely exposed, unprotected diesel fuel caps on either side of the vehicle. No lock. No cover. No barrier of any kind.

“Do you leave the door to your house exposed and open? Then why are you doing it to your Home on Wheels?”

Exposed diesel fuel cap on a Ford F-550 Super C motorhome showing the vulnerability

⚠️ Exposed fuel cap — no lock, no cover, completely accessible to anyone

Why Does This Vulnerability Exist?

Ford designs the F-550 and F-600 as commercial chassis — work trucks for construction sites, not luxury motorhomes. The fuel system was engineered for quick refueling by fleet operators, not for overnight parking at campgrounds across America.

When RV manufacturers like Entegra, Jayco, Grand Design, Dynamax, and Thor build their Super C motorhomes on these chassis, the fuel caps remain exactly as Ford designed them: completely exposed and unlocked.

Four Threats to Your Motorhome

Diesel Fuel Theft

$4.50+/gal

With diesel prices consistently above $4.50 per gallon and Super C motorhomes carrying 50–80 gallons per tank, your RV is sitting on $400–$700 worth of diesel. Thieves know this. A siphon hose and 60 seconds is all it takes.

Fuel Contamination

$5,000–$15,000

Water, sugar, sand, or other contaminants introduced through an unprotected fuel cap can destroy fuel injectors, fuel pumps, and your entire diesel engine. Repair costs for a diesel powertrain can easily exceed $10,000.

Vandalism & Tampering

Growing Threat

RVs parked at campgrounds, truck stops, and storage facilities are frequent targets. An exposed fuel cap invites tampering — from loosening the cap to inserting foreign objects into the fuel system.

Insurance Gaps

Often Denied

Many RV insurance policies classify fuel theft as a contents claim with high deductibles, and contamination damage may be excluded entirely. Prevention is far cheaper than filing a claim.

Real-World Scenarios

Overnight at a Campground

You park your $300,000 Super C Rig at a popular campground. While you sleep, someone walks up, unscrews your fuel cap, and siphons 40 gallons of diesel into jerry cans. You wake up to an empty tank and a $180+ loss.

Truck Stop Fuel-Up

You stop at a busy truck stop along I-75 to refuel. While you run inside for coffee, someone pours a bottle of water into your fuel tank through the unprotected cap on the other side. You discover the damage 50 miles later when your engine starts misfiring.

Long-Term Storage

Your Thor Four Winds sits in storage for the off-season. Over 3 months, road dust, moisture, and debris work their way past the loose fuel cap, contaminating your diesel. Your first trip of the season ends with a $6,000 injector replacement.

The Solution: The RV Fuel Vault™

The first and only security fuel cap cover purpose-built for Ford F-550 & F-600 Super C motorhomes. Heavy-duty steel. Tamper-resistant keyed lock. Bolt-on installation in 8–15 minutes. No modifications required. Patent Pending.

Pre-Order Now — $149.95 See How It Works

Set of 2 covers. Free shipping. 24-month warranty. 30-day satisfaction guarantee.

The $200,000+ Motorhome Witha $0 Fuel Security System