Prevent Sugar, Water & Sand in Your RV Gas Tank
A single handful of the wrong substance — sugar, water, sand, DEF, or windshield-washer fluid — can destroy your RV’s engine overnight. The RV Fuel Vault is an armored, tamper-resistant locking fuel door that physically seals the filler neck on Super C, Class C, and Class A motorhomes.
The Problem
- ✖Sugar in the tank dissolves slowly in hot fuel — by the time the engine fails, the damage is catastrophic ($5,000–$25,000)
- ✖Water-in-tank attacks modern diesel injection systems within hours — even a cup is enough to hydrolock pump seals
- ✖Sand or dirt poured through the open fuel neck destroys high-pressure injector tips and fuel-filter assemblies
- ✖Disgruntled ex-partners, vandals, or campground bullies only need 30 seconds alone with your RV to wreck it
- ✖Most comprehensive insurance policies exclude deliberate fuel tampering — the owner pays for the repair
- ✖An exposed OEM fuel cap can be hand-unscrewed by anyone — no tools required, no lock to bypass
The Solution
- Armored 3/16″ fiber-filled polymer physically covers the fuel neck — no one can pour anything into your tank
- Tamper-resistant keyed lock with recessed cylinder — no exposed lock to pick or break
- Blocks sugar, water, sand, DEF, bleach, and any other contaminant at the source
- Doubles as anti-siphon protection — two security layers in one armored shield
- Factory-finished look replaces the ugly exposed cap on Super C, Class C, and Class A motorhomes
- Single Door $99.95 • Set of 2 $199.95 • 3-Pack $299.95. Limited Lifetime Warranty. Made in Sarasota, Florida.
Frequently Asked Questions
Protect Your RV From Fuel Contamination
Fuel contamination from sugar, water, or debris is one of the most expensive forms of RV vandalism. The RV Fuel Vault locks down your entire filler neck area, making it physically impossible for anyone to introduce contaminants without the key.
Order Today — Starting at $99.95
Single Door, Set of 2, or 3-Pack · Free shipping · Limited Lifetime Warranty · 30-day guarantee
Order NowProudly Made in the USA · Patent Pending 64/085,223