How do thieves siphon fuel from an RV?

Fuel siphoning involves inserting a hose through the filler neck to drain fuel by gravity or suction. Most RV fuel caps can be removed by hand. The RV Fuel Vault prevents hose insertion entirely by sealing the filler neck behind a locked door.

Do anti-siphon devices work for RVs?

Anti-siphon mesh inserts offer some protection but can be bypassed with thin tubing or removed with tools. The RV Fuel Vault provides a complete physical barrier over the entire filler neck area.

Which RV models are most vulnerable to fuel siphoning?

Any motorhome with an exposed fuel cap is vulnerable. Super C models on Ford F-550/F-600, Class C models on Ford E-350/E-450, and Class A models on Ford F53 and Workhorse chassis are all common targets.

The RV Fuel Vault^™

RV Fuel Siphoning Prevention — Built for Motorhomes

A 3-foot siphon hose and $5 of tubing is all it takes. The RV Fuel Vault is an armored, tamper-resistant locking fuel door that physically blocks every siphon attempt on Super C, Class C, and Class A motorhomes.

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

The Problem

✖Diesel theft rings target RV campgrounds and truck stops — they can drain a 100-gallon tank in 6 minutes
✖A single siphoning incident costs $300–$700 in stolen fuel plus hours of downtime replacing what’s gone
✖Contaminated fuel from siphoning tampering destroys high-pressure common-rail diesel systems — $5,000–$15,000+ in repair bills
✖A standard OEM fuel cap offers zero resistance — a thief doesn’t even need tools, just a twist
✖Videos on YouTube show how to siphon a locked gas cap in under 60 seconds — caps alone are not enough

The Solution

Armored 3/16″ fiber-filled polymer physically covers the fuel neck — no siphon hose, no straw, no tube can be inserted
Tamper-resistant keyed lock with recessed cylinder — no exposed lock to pick, freeze, or break
Same key opens both driver- and passenger-side fuel doors in minutes at the pump
Bolt-on install with no modifications — fits the OEM fuel door area on F-550, F-600, E-350, E-450, F53, Workhorse, and Ram 5500
Protects your fuel and your engine — blocks contamination (water, sugar, sand, wrong-fluid) at the same time
Single Door $99.95 • Set of 2 $199.95 • 3-Pack with DEF cover $299.95. Limited Lifetime Warranty. Made in Sarasota, Florida.

Frequently Asked Questions

Stop RV Fuel Siphoning Before It Starts

Fuel siphoning is the most common method of fuel theft from motorhomes. The RV Fuel Vault is the definitive solution, providing a locked physical barrier that completely prevents access to your filler neck.

Order Today — Starting at $99.95

Single Door, Set of 2, or 3-Pack · Free shipping · Limited Lifetime Warranty · 30-day guarantee

Order Now

Proudly Made in the USA · Patent Pending 64/085,223