The Multiquip 1647551050 Pump Plunger is a genuine OEM component designed for the DAW-500S diesel arc welder. Sourced directly through Multiquip's authorized parts program, this plunger is built to the exact tolerances required for correct pump operation on DAW-500S equipment. If your machine is showing signs of fuel delivery issues or reduced pump output, replacing a worn plunger with the correct OEM part restores proper function and keeps your welder running at full capacity.
Key Features
- OEM-Grade Plunger Tolerancing — Manufactured to the precise dimensional specifications required for consistent fuel metering and pump stroke performance in the DAW-500S.
- Direct-Fit Replacement — Engineered to seat and seal exactly as the original, requiring no modification to the pump housing or surrounding fuel system components.
- DAW-500S Fitment Confirmed — Verified fitment for the Multiquip DAW-500S diesel arc welder/generator, so you can order with confidence.
- Restores Full Pump Output — A worn or scored plunger reduces fuel pressure and delivery consistency; this OEM replacement brings pump performance back to spec.
- Fuel System Integrity — Correct plunger fit is critical to maintaining a sealed fuel circuit — an improperly fitted or worn plunger can introduce air into the system and cause hard starts or erratic engine behavior.
The pump plunger is a precision-machined component inside the fuel injection or fuel transfer pump that moves back and forth to draw in and pressurize fuel before it reaches the engine. The fit between the plunger and its bore must be extremely tight to maintain the pressure required for efficient combustion — even minor wear on the plunger surface can cause fuel leakage past the bore, leading to low power output, rough running, or difficulty starting. Replacing a worn plunger with a correctly specified OEM part is one of the most direct ways to restore proper fuel delivery and engine performance.
For fitment questions or to confirm this part is correct for your specific DAW-500S serial range, contact the DHS Equipment team before ordering.
Part Details
| Part Number | 1647551050 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Pump Plunger |
Compatibility & Fitment
| Name | Model |
|---|---|
| Welders | DAW-500S |
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.
Multiquip