How common is RV diesel fuel theft?

Diesel fuel theft from RVs has increased significantly, especially at campgrounds, Walmart parking lots, truck stops, and rest areas. A full motorhome diesel tank can hold 50 to 100 gallons worth $300 to $600.

What is the best way to prevent diesel fuel theft from an RV?

The most effective prevention is a physical barrier over the fuel cap. The RV Fuel Vault provides a tamper-resistant locking door over the entire filler neck area.

Can thieves siphon diesel from an RV with a locking gas cap?

Locking gas caps provide minimal deterrence. They can be drilled, pried, or broken with basic tools in under a minute. The RV Fuel Vault seals the entire filler neck area behind a 3/16 inch fiber-filled polymer door.

Does diesel fuel theft damage the RV?

Beyond losing hundreds in fuel, improper siphoning can damage fuel lines, introduce contaminants, and compromise your fuel system.

Stop RV Diesel Fuel Theft

The Problem

✖50–80 gallons of diesel — $400–$700 per side — sitting unprotected behind an unlocked fuel cap

✖Diesel prices spike have made RVs a prime siphoning target at truck stops and overnight parking

✖A full tank can be siphoned in under 5 minutes while you sleep

✖Contaminated fuel from tampering or water-pouring can cost $5,000–$15,000+ in high-pressure common-rail repairs

✖OEMs do not ship any factory fuel cap security with F-550, F-600, or Ram 5500 motorhome chassis

The Solution

Patent-pending (U.S. Application 64/085,223) locking fuel cap cover engineered specifically for diesel motorhomes

Fits all Ford F-550 & F-600 Super C and Ram 5500 Super C chassis from Entegra, Jayco, Thor, Grand Design, Dynamax, Holiday Rambler & more

Tamper-resistant keyed lock in a 3/16″ fiber-filled polymer door — corrosion-proof and virtually unbreakable

Bolt-on install in 8–15 min — zero modifications. Same key opens both sides.

Single Door ($99.95) • Set of 2 ($199.95) • 3-Pack with DEF cover ($299.95) • Free U.S. shipping

Limited Lifetime Warranty • 30-day satisfaction guarantee • Made in the USA

RV Diesel Fuel Theft: A Growing Problem

With diesel prices remaining elevated, fuel theft from motorhomes has become an increasingly common crime. Super C, Class C, and Class A motorhomes are especially vulnerable because their exposed fuel caps make them easy targets.

The RV Fuel Vault stops diesel fuel theft by sealing your filler neck behind a tamper-resistant locking door. It is the only patent-pending locking fuel door designed specifically for motorhome chassis.

Stop Diesel Fuel Theft From Your Motorhome

The Problem

The Solution

Frequently Asked Questions

RV Diesel Fuel Theft: A Growing Problem

Order Today — Starting at $99.95