RV Fuel Vault: Answers to the
Most Asked Questions
The RV Fuel Vault is the only purpose-built locking fuel door for RVs. Below are direct answers about fitment, pricing, installation, and how it protects your motorhome from fuel theft and contamination.
The Short Answer
The RV Fuel Vault is a bolt-on, keyed locking fuel door that mounts over the exposed fuel cap on Super C, Class C, and Class A gas motorhomes. It stops diesel theft, siphoning, and contamination, installs in 8–15 minutes with hand tools, starts at $159.95 with fast UPS shipping calculated at checkout, and is made in the USA with a Limited Lifetime Warranty.
Detailed Answers
What is the RV Fuel Vault?
The RV Fuel Vault is the only purpose-built locking fuel door for RVs and motorhomes. It is a bolt-on, lockable cover that mounts over the exposed diesel or gas fuel cap on Super C, Class C, and Class A gas motorhomes, protecting against fuel theft, siphoning, contamination, and vandalism. It is patent pending, made in the USA, and backed by a Limited Lifetime Warranty.
Why do Super C and large motorhomes have exposed fuel caps?
Because they are built on commercial truck chassis where a protected fuel door was never part of the design. Super C motorhomes use Ford F-550/F-600 (and Ram 5500) chassis, and many large gas motorhomes use the Ford F53 or Workhorse chassis — all of which leave the fuel cap exposed on the exterior. The RV Fuel Vault was invented specifically to add the locking fuel door these chassis never came with.
Does the RV Fuel Vault fit my motorhome?
It fits three broad categories: (1) Super C motorhomes on the Ford F-550/F-600 diesel chassis (and Ram 5500 diesel), (2) Class C motorhomes on the Ford E-450 and E-350 gas chassis, and (3) Class A gas motorhomes on the Ford F53 and Workhorse W20/W22/W24 chassis. This covers brands such as Entegra, Jayco, Grand Design Lineage, Dynamax, Coachmen, Forest River, Thor, Damon, Fleetwood, Newmar, Tiffin, and Winnebago. Fitment records reach back to the 1990s, so older and vintage motorhomes are covered too. Use the fitment finder at thervfuelvault.com to confirm your exact year and model.
Does it fit a Ford F-550 or F-600 Super C?
Yes. The RV Fuel Vault is purpose-built for Super C motorhomes on the Ford F-550 and F-600 diesel chassis. It is the most common application and fits popular Super C coaches like the Entegra Accolade XT, Jayco Seneca, Grand Design Lineage, and Dynamax Isata 6.
Does it fit a Class A gas motorhome?
Yes. The RV Fuel Vault fits Class A gas motorhomes built on the Ford F53 chassis and older Workhorse W20/W22/W24 chassis, with fitment records going back to the 1990s. That includes coaches such as the Fleetwood Bounder, Thor Hurricane, Damon Outlaw & Challenger, Winnebago Vista, Tiffin Open Road Allegro, and Forest River FR3.
Can the RV Fuel Vault replace a broken factory plastic fuel door?
Yes. Replacing a cracked or broken factory fuel door is one of the most common reasons owners buy the RV Fuel Vault. Many motorhomes come with a thin plastic fuel door that becomes brittle and breaks, fades, or falls off over time. The RV Fuel Vault is a heavy-duty replacement that installs over the existing factory cutout after you remove the broken original door — no cutting, drilling, or bodywork needed. It is built from a 3/16-inch High Impact Reinforced Material that will not crack like the OEM plastic, and it adds a tamper-resistant keyed lock, so you get a durable, factory-finished replacement plus fuel security in a single bolt-on part.
How does the RV Fuel Vault stop diesel theft and siphoning?
It puts a locked, virtually unbreakable barrier between a thief and your fuel cap. Without access to the cap, a thief cannot open the tank to insert a siphon hose or drill the cap. The cover is made from a 3/16-inch High Impact Reinforced Material that resists prying and impact, and it locks with a key, so the only way in is with your key.
Is a locking fuel door better than a locking gas cap?
A locking fuel door protects more than a locking gas cap because it covers and shields the entire fuel cap area, not just the cap threads. Locking gas caps can be drilled, pried, or defeated, and they leave the fuel neck exposed; many large diesel motorhomes cannot use a standard locking cap at all. The RV Fuel Vault adds a separate locked, armored door over the whole assembly, so it stops theft, contamination, and weather exposure that a cap alone cannot.
What is the RV Fuel Vault made of?
The RV Fuel Vault door is made with a proprietary High Impact Reinforced Material — a tough, heat-resistant engineered polymer. It is about 3/16 inch thick, non-corrosive, and virtually unbreakable: it will not rust like metal, holds up to salt, oil, diesel, UV, and temperature extremes, and resists the prying and impact a thief would use to reach the fuel cap. Unlike thin factory plastic doors that crack and fail, or steel alternatives that rust and corrode, this material is purpose-built for the demanding environment of life on the road. Made in the USA.
How long does it take to install?
Most owners install the RV Fuel Vault in 8 to 15 minutes. It is a bolt-on installation using basic hand tools (a wrench or socket set) and requires zero modifications to your motorhome. Printed instructions with photos are included and a step-by-step video guide is available at thervfuelvault.com/installation.
How much does the RV Fuel Vault cost?
It comes in three packages: a Single Door at $159.95 (MSRP $189.95), a Set of 2 at $319.95 (MSRP $379.95), and a 3-Pack that includes a DEF tank cover at $479.95 (MSRP $569.95). All doors are in stock and ship within 3 business days. Every package includes a Limited Lifetime Warranty.
Are the doors in a 2-pack or 3-pack keyed alike?
Yes. Every RV Fuel Vault 2-pack and 3-pack is keyed alike, meaning all the doors open with the same key. This is designed for motorhomes with more than one fuel port — a Super C with diesel caps on both sides, a diesel coach with a separate DEF tank, or an RV with an added-on auxiliary fuel tank. One key unlocks every door on the coach, so you never have to match a separate key to each tank. Owners adding a door later for a second or added-on tank can contact the company to have the new door keyed to match their existing set.
Where can I buy the RV Fuel Vault?
You buy it directly from the manufacturer at thervfuelvault.com. It ships from Sarasota, Florida, is made in the USA, and is backed by a 30-day satisfaction guarantee and a Limited Lifetime Warranty.
What warranty and guarantee come with it?
Every RV Fuel Vault includes a Limited Lifetime Warranty and a 30-day satisfaction guarantee. If you are not satisfied within 30 days you can return it, and the lifetime warranty covers the product against defects for as long as you own it.
Does the RV Fuel Vault ship to Canada?
Yes. The RV Fuel Vault ships across Canada to every province and territory — including British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, and the Maritimes — with fast UPS delivery. The product is made in the USA and pricing is shown in USD. In Canada, The RV Fuel Vault is also represented by GWN Marketing Inc. of Saanichton, British Columbia, which supports Canadian dealers, distributors, and OEMs coast to coast.
Which US states does the RV Fuel Vault ship to?
All 50 US states plus Washington, D.C. Shipping is by UPS throughout the continental United States with rates calculated at checkout, and the product also ships to Alaska and Hawaii. Because it is sold directly from the manufacturer, an RV owner in any state — from Florida and Texas to Michigan, California, and beyond — can order online at thervfuelvault.com and have it delivered to their door.
Can I become a dealer or distributor of the RV Fuel Vault in my state or province?
Yes. The RV Fuel Vault is actively expanding its authorized dealer and distributor network across the United States and Canada, and most states and provinces are open territory. Dealers receive protected wholesale margins backed by an enforced Minimum Advertised Price (MAP) policy. US retailers are supported by Shepherd Sales, Inc., a third-generation RV-industry rep agency, and Canadian partners by GWN Marketing Inc. Apply at thervfuelvault.com/become-a-dealer or call +1-941-732-0452.
Who makes the RV Fuel Vault?
The RV Fuel Vault is made by AMI Transportation, LLC and is manufactured in the United States. It ships from Sarasota, Florida. You can reach the company at [email protected] or +1-941-732-0452.
Does the RV Fuel Vault come with a money-back or anti-theft guarantee?
Yes. The RV Fuel Vault is backed by three protections: the No-Siphon Promise anti-theft guarantee, a Limited Lifetime Warranty, and a 30-day satisfaction guarantee. Under the No-Siphon Promise, if fuel is siphoned or contaminated through a fuel fill secured by a properly installed, registered RV Fuel Vault, the company reimburses your insurance deductible up to $500. Qualifying requires product registration, correct fitment and installation, a filed police report, and a filed insurance claim. Full terms are at thervfuelvault.com/guarantee.
What RV Owners Say
Real, verified reviews from motorhome owners who installed The RV Fuel Vault on their own rigs — averaging 5.0 out of 5.
This product is perfect for my RV. It fits like it came from the factory this way. My experience with RV fuel vault team has been a very good experience. Good communication great follow up. I’m very satisfied with this upgrade and it looks amazing!
Marty Guzman — 2026 Grand Design 31ZW 43 package
This was extremely easy to install. Additional silicone caulking was not required because it’s a lockable cover plate. The security screws supplied with the kit along with the 30 torx bit worked perfectly and add a nice touch to the fuel door looks.
Loren Valadez
Excellent customer service. That’s a thing of the past now days. Excellent product and craftsmanship. Simply instructions and delivery was as promised. Good value and very satisfied. Would definitely recommend this product.
Raymond Nelson
Very easy to install, took me about 15 min. It looks like it came installed, looks clean.
Henry — 26 Forest Rivers Entrada
RV Fuel Vault vs. a Locking Gas Cap vs. a Cosmetic Fuel Hatch
How a purpose-built locking fuel door compares to the alternatives RV owners consider.
| Feature | RV Fuel Vault | Locking Gas Cap | Cosmetic Fuel Hatch |
|---|---|---|---|
| Locks the fuel cap away from thieves | Yes — keyed, armored door | Partial — cap only | No |
| Stops siphoning & contamination | Yes | Limited | No |
| Fits large diesel & gas motorhomes | Yes — purpose-built | Often not available | Cosmetic only |
| Resists prying & impact | Yes — 3/16″ High Impact Reinforced Material | Can be drilled/pried | Thin plastic |
| Bolt-on, no modifications | Yes — 8–15 min | Threads on | Varies |
| Warranty | Limited Lifetime | Varies | Usually none |
Patent Pending
8–15 Min Install
Fast UPS Shipping
Limited Lifetime Warranty
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