The Wacker Neuson Injection Pump is a genuine OEM component designed for the G40 and G50 series portable generators. As a direct OEM replacement, this injection pump is sourced from Wacker Neuson and built to the same specification as the original unit fitted at the factory — ensuring accurate fuel metering and consistent engine performance across the G40 and G50 generator lineup. Compatible with multiple G40 configurations including standard, mobile, and LATAM Premium variants, as well as the G50 generator, this part covers a broad range of units within the G-series family. When your generator's fuel delivery system needs attention, fitting the correct OEM part is the most straightforward path back to full rated output.
Key Features
- Genuine OEM Fuel Delivery Accuracy — Calibrated to the original injection timing and volume specs, maintaining the precise fuel-to-air ratio the G40 and G50 engines require for stable power output.
- Drop-In Replacement — Matches the original mounting configuration and fuel line connections of the G40 and G50 generator engines, so installation follows the standard service procedure.
- Broad G-Series Compatibility — Fits multiple G40 variants (standard, mobile, and LATAM Premium configurations) as well as the G50 generator, making it the go-to service part across the G-series range.
- Consistent Engine Starting and Load Response — A correctly functioning injection pump ensures smooth cold starts and stable power delivery under load; a worn or failing pump leads to hard starting, erratic output, and excessive fuel consumption.
- Fuel System Integrity — As a critical component in the high-pressure fuel circuit, using an OEM-specified pump helps maintain sealed, leak-free operation and protects downstream injector components from damage caused by improper flow rates.
The injection pump is responsible for drawing fuel from the tank and delivering it at the correct pressure and timing to the engine's fuel injectors. On diesel-powered portable generators like the G40 and G50, the injection pump is central to engine management — controlling the volume and timing of fuel entry into the combustion chamber directly affects power output, fuel efficiency, and emissions. When an injection pump wears or fails, symptoms typically include difficulty starting, loss of power under load, rough running, or excessive smoke from the exhaust. Replacing it with a genuine OEM part restores the original calibration and protects the rest of the fuel system from the knock-on effects of under- or over-fueling.
Part Details
| Part Number | 5200021125 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Injection Pump |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Generator | G40 | 5200015906, 5200015907, 5200016640, 5100029184 |
| Generator | G50 | 5200015909 |
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.
