The Wacker Neuson Fuel Tank Cap is a genuine OEM component designed for the HI 300HD D, HI 400HD D, and HI 120HD indirect-fired diesel air heaters. Sourced directly from Wacker Neuson, this cap matches the exact specifications of the original part installed at the factory. It is a direct-fit replacement for all three HI-series heater models listed, requiring no modification to seal correctly. Keep a spare on hand — a missing or damaged fuel cap is one of the most common causes of fuel contamination and heater downtime on the jobsite.
Key Features
- Genuine OEM Sealing Integrity — Engineered to the same material and thread specification as the original, ensuring a fuel-tight seal that prevents contamination and vapor loss.
- Direct Thread-In Replacement — Matches the original filler neck thread pattern on HI-series heaters for a clean, tool-free swap with no fitment adjustments.
- Confirmed Fitment Across Three HI-Series Models — Verified for the HI 300HD D, HI 400HD D, and HI 120HD indirect-fired diesel air heaters.
- Protects Fuel System Cleanliness — A properly seated cap keeps moisture, debris, and contaminants out of the fuel tank, protecting injectors and the burner assembly from premature wear.
- Fuel System Safety — A correctly fitted cap maintains proper tank venting and prevents fuel spillage during transport and operation, reducing fire and spill hazards on site.
The fuel tank cap seals the diesel fuel filler opening on indirect-fired air heaters, keeping the fuel supply clean and contained during operation and transport. It plays a quiet but critical role — without a properly sealing cap, water and debris can enter the tank and clog fuel filters or damage the burner, leading to inconsistent heat output or a no-start condition. A worn, cracked, or missing cap should be replaced immediately to maintain safe and consistent heater performance.
Part Details
| Part Number | 5000183937 |
|---|---|
| Old Part Number | 0183937 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Fuel Tank Cap |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI 300HD D Indirect Air Heater, Diesel | HI300HDD | 5000620867 |
| HI 400HD D Indirect Air Heater | HI400HDD | 5000620868 |
| HI 120HD | HI120HD | 5200019343 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
