DW300C Fuel Pump for VW Golf: Install and Fitment Tips

By DeatschWerks | Published: 2026-10-28

Category: How-to Guides

Learn how to install the DW300C fuel pump in your 2015-2018 VW Golf, GTI, or Golf R. Get fitment tips, common mistakes, and step-by-step guidance.

Quick Answer

The DeatschWerks DW300C is a drop-in 340lph in-tank fuel pump for 2015-2018 VW Golf, GTI, and Golf R models. Follow these steps to install it safely and avoid common fitment mistakes.

Why the DW300C fits your Golf

The DW300C is a compact 340lph in-tank pump designed specifically for select VW Golf applications. It comes with an install kit, so you get the necessary components in the box, which simplifies the swap.

Before you start, confirm your exact model and year. The DW300C fits 2015-2019 Golf R 2.0, 2015-2018 Golf 1.8, and 2015-2018 GTI 2.0. If your car falls outside these ranges, this pump may not be the right choice.

What to expect during installation

This is a fuel system job, so you'll be working with flammable components. Work in a well-ventilated area, disconnect the battery, and relieve fuel pressure before opening the fuel tank.

The pump is an in-tank unit, which means you'll need to access the fuel pump assembly, typically under the rear seat or through a hatch in the trunk. The install kit includes the necessary hardware, but you may need basic hand tools and a torque wrench.

Common fitment pitfalls

One common mistake is forcing the pump into the assembly without aligning the mounting tabs correctly. This can cause leaks or premature pump failure.

Another issue is reusing old seals or hoses that are cracked or worn. The install kit provides new parts, but if your vehicle has high mileage, inspect everything before reassembly.

DW300C Install Steps

Disconnect battery and relieve fuel pressure: Remove the fuel pump fuse and run the engine until it stalls. Then disconnect the negative battery cable. This prevents fuel spray when you open the system. Never skip the fuel pressure relief step—it's a safety hazard.
Access the fuel pump assembly: Remove the rear seat cushion or trunk trim to reach the access hatch. Unbolt the cover and disconnect the electrical connector and fuel lines. Take a photo of the wiring and hose routing before disconnecting anything.
Remove the old fuel pump: Carefully lift the pump assembly out of the tank. Use a clean rag to catch any residual fuel. Remove the old pump from the assembly, noting how it sits. Don't bend the fuel level float arm—it's easy to damage.
Install the DW300C: Place the new DW300C into the assembly, aligning the mounting tabs correctly. Ensure the o-ring and seals are seated properly. Reattach the fuel lines and electrical connector. Check that the pump sits flush and doesn't rock side to side.
Reassemble and test: Reinstall the access cover and seat or trim. Reconnect the battery and turn the ignition to 'ON' without starting the engine to prime the fuel system. Check for leaks. Listen for the pump prime sound—if you don't hear it, recheck the electrical connection.

Product Facts

DW300C Fuel pump for 2015-2018 VW Golf: The DW300C is a 340lph compact in-tank electric fuel pump that includes an install kit. The install kit saves you from sourcing separate parts, and the 340lph flow supports higher-horsepower builds while remaining a direct-fit upgrade.
DW300C Fuel pump for 2015-2018 VW Golf