The Wacker Neuson Fuel Pump is a genuine OEM component designed for G25 and G20 portable generators and LTW20Z series light towers. As a direct factory replacement, this part restores proper fuel delivery to the engine, keeping your generator or light tower running at full rated output. It is verified across a wide range of G25 configurations — including Standard, Cold Weather, Custom, and Extended Run variants — as well as LTW20Z-1 and LTW20Z-3 light tower models in Tier 4i and T4F emissions configurations.
Key Features
- Genuine OEM Fuel Flow Precision — Manufactured to Wacker Neuson's exact flow rate and pressure specifications, ensuring the engine receives consistent, correctly metered fuel delivery across all load conditions.
- Direct-Mount Replacement — Engineered to match the original mounting configuration and fuel line connections on G25, G20, and LTW20Z series machines, so installation follows the standard service procedure without adaptation.
- Broad Series Compatibility — Fits an extensive range of G25 generator configurations (Standard, Cold Weather, Custom, Extended Run, T4i, T4F, and 600V variants), G20 mobile generators, and LTW20Z-1 and LTW20Z-3 light towers including V and V S frame variants.
- Sustained Engine Performance — A worn or failing fuel pump causes hard starting, erratic output, and engine shutdowns under load. Replacing it with part 5000116339 restores clean, steady fuel supply and full power availability.
- Fuel System Integrity — As a genuine OEM part, the 5000116339 meets the material and sealing standards required for safe, leak-free operation within the fuel delivery circuit.
The fuel pump is responsible for drawing fuel from the tank and delivering it at the correct pressure to the engine's fuel system. Without consistent fuel supply, the engine cannot maintain stable combustion, which leads to power fluctuations, stalling, or a failure to start altogether. Over time, pump diaphragms and internal valves wear or harden, reducing output pressure and volume — replacing the pump with a genuine OEM unit like the 5000116339 restores the fuel system to its original operating condition.
Part Details
| Part Number | 5000116339 |
|---|---|
| Old Part Number | 0116339 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Fuel Pump |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Mobile Generator, Custom | G25 | 5000620346, 5000620344, 5000620345, 5000620642, 5000009466, 5000620004, 5000620640, 5000620709, 5000620641, 5000009368, 5200005557, 5200003991, 5000620931, 5200001316, 5200014461, 5000009258, 5200014460, 5200014462, 5000621005, 5000008228, 5100022834, 5000009462, 5000009476, 5100042507, 5100042510, 5100042512, 5100042509, 5100025836, 5100042508 |
| LTW20Z-1, LIGHT TOWER 60Hz, ISUZU, CUSTOM, T4i | LTW20Z1 | 5000620842, 5000620375, 5200004205, 5200004096, 5200023191, 5200024872 |
| LTW20Z-3, LIGHT TOWER 60HZ, ISUZU TIER 4i | LTW20Z3 | 5000620376, 5000620843, 5200003583, 5200004097, 5200023192 |
| LTW20Z3-V S LIGHT TOWER, COLD WEATHER, T4i | LTW20Z3-V S | 5200018566, 5200018558, 5200018562, 5200023196, 5100015094, 5100022126 |
| LTW20Z1-V S LIGHT TOWER, COLD WEATHER, T4i | LTW20Z1-V S | 5200018565, 5200018557, 5200018561, 5200024875, 5200023195, 5100015093, 5100022125 |
| Light Tower | LTW20Z3-V | 5200012881, 5200012885, 5200012867, 5200022694 |
| Light Tower | LTW20Z1-V | 5200012880, 5200012884, 5200012866 |
| Mobile Generator, Skid Mounted | G12 | 5000008227 |
| Mobile Generator | G20 | 5200016628, 5200022625 |
| Light Tower | LT4Z | 5000007635, 5000007689, 5000009080, 5000009226 |
| Light Tower | LTP4Z | 5000007636, 5000008063, 5000009227 |
| Light Tower | LTW4Z | 5000008064 |
| Light Tower | LTWP4Z | 5000008065 |
| Light Tower | LTW6Z | 5000008068 |
| Light Tower | LT4SZ | 5000007637 |
| Light Tower | LTP4SZ | 5000007638 |
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.
