Why is a locking fuel door better than a fuel cap cover?

A cover just hides the cap. The RV Fuel Vault is a full door with a tamper-resistant lock that provides real security against theft and siphoning, seals out weather and contaminants, and gives your rig a factory-finished look. It solves every problem a cap cover cannot.

Will this fit over my existing fuel cap?

Yes. The RV Fuel Vault mounts over your existing filler neck and cap. You keep your original fuel cap — the door covers and locks over everything. Exact-fit for your specific chassis.

What about locking gas caps — are those good enough?

Locking gas caps can be defeated in seconds with basic tools — they are a deterrent, not real security. They also do nothing to protect the filler neck from weather and contamination. The RV Fuel Vault provides full coverage and a tamper-resistant lock.

How long does installation take?

8-15 minutes with basic hand tools. No drilling, no cutting, no body modifications. Bolt-on over your existing filler neck area.

How much does it cost?

Starting at $84.95. Free shipping. Limited Lifetime Warranty. 30-day satisfaction guarantee.

More Than a Cover \u2014 A Complete Fuel Door

Stop Searching for a Fuel Cap Cover \u2014 Get a Full Locking Fuel Door

If you are searching for the best RV fuel cap cover, you have probably noticed the options are terrible. Cheap plastic snap-on covers that blow off at highway speed. Locking gas caps that get pried off in seconds. Generic covers that do not fit motorhome chassis. The RV Fuel Vault is different \u2014 it is a complete locking fuel door that covers, protects, and secures your entire filler neck area.

The RV Fuel Vault — Locking Fuel-Door Enclosure — locking fuel door for motorhomes

The Problem

✖Cheap fuel cap covers blow off at highway speed or crack in the sun within months
✖Locking gas caps only protect the cap itself — the filler neck is still completely exposed
✖Universal covers from Amazon do not fit motorhome chassis — wrong dimensions, wrong mounting
✖Your exposed fuel cap collects road grime, water, and debris every mile you drive
✖That ugly green diesel cap or blue DEF cap ruins the look of your driver side
✖You need more than a cover — you need a door that locks

The RV Fuel Vault Solution

A complete locking fuel door — not just a cap cover but a full door with tamper-resistant key lock
Purpose-built for your exact motorhome chassis — fits like it came from the factory
High-strength 3/16″ fiber-filled polymer that will never crack, fade, or blow off at highway speed
Covers the entire filler neck area — not just the cap, but everything around it
Factory-finished look that actually improves the appearance of your driver side
Bolt-on in 8-15 minutes — no modifications to your motorhome whatsoever
Starting at $84.95 — costs less than the fuel you are protecting

See the Difference

$Exposed fuel cap \u2014 no cover, no protection$

✖ Exposed fuel cap \u2014 no cover, no protection

✓ The best fuel cap cover is a full locking fuel door

Why You Need a Locking Fuel Door

Lead with finish. End with security.

Better Than Any Cover

A cover hides the problem. The RV Fuel Vault solves it — security, weather protection, and a factory-finished look in one product.

Actual Security

Tamper-resistant keyed lock stops theft, siphoning, and vandalism. A cap cover cannot do any of that.

Complete Seal

Protects the entire filler neck area from water, road grime, and contaminants — not just the cap opening.

Built to Last Forever

UV-resistant, corrosion-proof polymer. Limited Lifetime Warranty. This is not a disposable cover — it is a permanent upgrade.

Installs in 8–15 Minutes — No Drilling, No Cutting

8–15 Minutes

Average install time

Basic Hand Tools

No special equipment needed

100% Reversible

No drilling, no cutting, no mods

Compatible Chassis & Models

Manufacturer	Models / Floorplans
Ford E-350 / E-450	Class C — Coachmen, Thor, Winnebago, Jayco, East to West, Entegra, Forest River, Gulf Stream
Ford F-550 / F-600	Super C — Thor, Dynamax, Entegra Accolade/Accolade XL, Jayco, Renegade
Ford F53	Class A — Coachmen, Thor, Winnebago, Tiffin, Fleetwood, Newmar, Holiday Rambler
Workhorse W22/W24	Class A — Coachmen Mirada, Thor Windsport/Hurricane
Ram 5500	Super C — Dynamax Isata 5, Grand Design Lineage

Don't see your model? Use the Fitment Finder — we likely fit your rig.

Frequently Asked Questions

Common questions about The RV Fuel Vault

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Order Today — Starting at $84.95

Single Door, Set of 2, or 3-Pack · Free Shipping · Limited Lifetime Warranty · 30-Day Guarantee

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Proudly Made in the USA · Patent Pending 19/632,042 · Est. delivery by July 4, 2026