Grand Design Lineage Locking Fuel Door — Secure Your Ford Super C
The Grand Design Lineage Series F and LE 43 are Super C diesels built on the Ford F-550/F-600 chassis. Grand Design left the two diesel caps and the DEF cap completely exposed. The RV Fuel Vault 3-Pack is the exact-fit armored locking enclosure your Lineage needs.
Why a Locking Gas Cap Is Not Enough
- ✖Your Grand Design Lineage has two exposed diesel caps and an exposed DEF cap — no factory fuel door
- ✖A large diesel fuel supply is a theft target at every stop
- ✖DEF or fuel contamination from tampering can cause catastrophic engine damage and costly repairs
- ✖Generic locking caps are easily defeated and only protect one filler at a time
- ✖Road debris and fuel splash-back damage the finish around your exposed filler area
Why a Locking Fuel Door Beats a Locking Gas Cap
- Factory-finished look — eliminates the exposed caps on your Lineage
- The 3-Pack covers both driver-side diesel caps and the DEF cap
- Tamper-resistant keyed lock secures your diesel and DEF
- High Impact Reinforced Material — built for premium Super C ownership
- Bolt-on in 8-15 minutes per door — no drilling, no cutting, no modifications
- Corrosion-proof construction rated for year-round use in any climate
Before & After: Your RV's Exposed Fuel Cap vs. a Locking Fuel Door
Why You Need a Locking Fuel Door
Lead with finish. End with security.
Factory-Finished Look
Eliminates the exposed plastic caps on your Lineage. Looks factory-installed.
Fuel Theft Prevention
Keyed lock stops siphoning at campgrounds, rest stops, and storage facilities.
Contamination Defense
Prevents sugar, water, or foreign substances from being added to your fuel or DEF tank.
Vandalism Protection
Tamper-resistant design deters opportunistic damage to your fuel system.
How It Installs — 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 Ford F-550/F-600 (Grand Design Lineage) Motorhomes
The Grand Design Lineage Series F and LE 43 are built on the Ford F-550/F-600 (including F-600 4x4) with 2 driver-side diesel caps and 1 driver-side DEF cap — that is the 3-Pack. The Lineage Series E is on the Ford E-450.
| Manufacturer | Models / Floorplans |
|---|---|
| Grand Design Lineage Series F | 31ZW, 31ZW5, 31FZ (F-550/F-600), 29AN, 29AN5 (F-600 4x4) |
| Grand Design Lineage LE 43 | Ford F-550/F-600 and F-600 4x4 |
Frequently Asked Questions
Common questions about The RV Fuel Vault on Ford F-550/F-600 (Grand Design Lineage) motorhomes
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