Walbro Fuel Filter Sock - 125-147

The Walbro Fuel Filter Sock (Part #125-147) is the genuine Walbro replacement inlet strainer designed to work with the popular Walbro GSS341 255 LPH in-tank fuel pump. Whether you're building a performance street car, a dedicated track build, or simply maintaining an existing Walbro pump installation, keeping a fresh filter sock in place is one of the easiest ways to protect your investment and keep fuel flow clean and unrestricted. This strainer mounts directly to the turbine inlet of the pump and acts as the first line of defense against particulate contamination in your fuel tank.

Key Features & Benefits

• Direct-Fit for Walbro GSS341 Pumps: Engineered specifically to mate with the GSS341 turbine inlet, so you get a precise, leak-free connection without modification or adapters.
• 31-Micron Mesh Filtration: The 31-micron filter media captures fine debris and sediment before it can enter the pump, helping protect internal components and extend pump service life.
• Square Body, 90-Degree Orientation: The sock sits at a 90-degree angle on the pump — a specific geometry you should verify matches your pump's existing strainer configuration before ordering.
• 11 mm Inlet Fitting: The standardized 11 mm inlet ensures compatibility with the GSS341 pump body without requiring special fittings.
• Compact Dimensions: At 57.5 mm × 55.0 mm, the strainer is sized to fit within typical in-tank fuel sender assemblies without clearance issues on supported applications.
• Replacement/Maintenance Part: Ideal for replacing a clogged or aged strainer during a pump service interval, a fuel tank cleaning, or any time you're pulling the pump for inspection.
• Suitable for Passenger Cars and Trucks: Fits a broad range of vehicle service types running the compatible Walbro GSS341 pump.

Specifications

• Part Number: 125-147
• Brand: Walbro
• Filter Type: Turbine Inlet Fuel Pump Strainer (Fuel Filter Sock)
• Filtration Rating: 31 Micron Mesh
• Dimensions: 57.5 mm × 55.0 mm
• Inlet Size: 11 mm
• Orientation: Square body, sits 90 degrees on the pump
• Outer Material: Plastic
• Compatible Pump: Walbro GSS341 255 LPH EFI In-Tank Fuel Pump

Fitment

The Walbro 125-147 fuel filter sock is designed for use with the Walbro GSS341 255 LPH in-tank fuel pump and is suitable for passenger cars and trucks running that pump. Because the GSS341 is widely used across performance and OEM-style replacement applications spanning many makes and models, compatibility is ultimately determined by which pump is installed in your vehicle — not the vehicle itself.

Important: The 125-147 strainer features a square body that sits at a 90-degree angle relative to the pump. Before purchasing, confirm that your current fuel pump or sender assembly uses this specific strainer geometry. If your existing strainer has a different shape or orientation, a different Walbro strainer part number may be required. When in doubt, contact our team for fitment guidance.

What's in the Box

• 1× Walbro 125-147 Fuel Filter Sock / Turbine Inlet Strainer

Why Buy from ThreePiece.us

• Free Shipping on Every Order: No minimums, no surprises — your Walbro fuel filter sock ships free.
• Affirm Financing Available: Spread the cost of your fuel system build over time with easy Affirm financing at checkout.
• Expert Fitment Help: Not sure if the 125-147 is the right strainer for your pump or build? Our team can help you confirm compatibility before you order.

Frequently Asked Questions

Q: Which fuel pump does the Walbro 125-147 fit?
A: The 125-147 is specifically designed to fit the Walbro GSS341 255 LPH EFI in-tank fuel pump. It attaches at the turbine inlet of the pump.

Q: What is the filtration rating of this strainer?
A: The 125-147 features a 31-micron mesh, which captures fine particulate before it enters the pump body.

Q: How does the 125-147 sit on the pump — does the orientation matter?
A: Yes, orientation matters. The 125-147 is a square-body strainer that mounts at a 90-degree angle on the pump. You should verify that your GSS341 installation uses this specific strainer configuration before ordering, as other Walbro strainer designs are available with different geometries.

Q: When should I replace my fuel pump filter sock?
A: It is good practice to replace the inlet strainer any time you remove the fuel pump for service, after a fuel tank cleaning, or if you suspect contamination in your fuel system. A clogged strainer restricts fuel flow to the pump, which can cause poor pump performance or premature pump wear.