Walbro / TI Automotive GSS340 255lph High Pressure In-Tank Fuel Pump | Universal

The Walbro GSS340 255lph High Pressure In-Tank Fuel Pump is one of the most popular and proven aftermarket fuel pumps in the performance world — a universal high-pressure in-tank fuel pump rated at 255 litres per hour (lph) that supports engines producing more than 500HP. Manufactured by TI Automotive under the Walbro brand name — the same company that has been building performance fuel pumps for over 60 years — the GSS340 is a direct-fit or universal in-tank pump that delivers high-pressure, high-flow fuel delivery across a wide pressure range for turbocharged, supercharged, and naturally aspirated performance engines. The GSS340G3 is the current Generation 3 version of the GSS340 — proudly union made at TI Automotive's Caro, Michigan manufacturing plant. TI Automotive fuel pumps are never manufactured or assembled by a third party or sourced from an outside company.

Key Features:

• 255lph flow rate — 255 litres per hour fuel flow at high pressure — supports engines producing more than 500HP on gasoline — one of the most popular flow ratings in the performance aftermarket for turbocharged and supercharged builds
• High pressure — high-pressure pump design for fuel injected applications — delivers consistent fuel pressure across a wide operating pressure range
• In-tank design — in-tank fuel pump — installs inside the fuel tank in the factory fuel pump location or in a custom in-tank fuel pump hanger — in-tank mounting keeps the pump cool and primed for reliable operation
• Universal fitment — universal pump that can be installed in a wide range of vehicles using the correct fuel pump hanger, wiring, and fuel line connections for the specific application
• Generation 3 (G3) — current generation GSS340 — TI Automotive's latest iteration of the proven GSS340 design
• Multi-fuel compatible — TI Automotive fuel pumps are engineered for use across a variety of fuels — verify compatibility with your specific fuel type (E85, methanol, etc.) before ordering
• Made in USA — proudly union made at TI Automotive's Caro, Michigan plant — never manufactured or assembled by a third party
• TI Automotive / Walbro quality — over 60 years of fuel pump manufacturing heritage — the most trusted name in performance fuel pumps

GSS340 — Why It's the Industry Standard:

The Walbro GSS340 255lph pump has been the go-to performance fuel pump upgrade for turbocharged and supercharged builds for decades — a pump that has proven itself in hundreds of thousands of performance builds across virtually every platform. The GSS340's combination of 255lph flow, high-pressure capability, universal fitment, and TI Automotive's manufacturing quality makes it the correct first fuel pump upgrade for any performance build that has outgrown the factory pump's flow capacity. For builds targeting 300–500HP on gasoline, the GSS340 is typically the correct single-pump solution. For builds beyond 500HP or running E85, a larger pump or dual-pump setup may be required — consult your tuner for the correct fuel pump specification for your specific build.

In-Tank vs. In-Line — Why In-Tank:

The GSS340 is an in-tank fuel pump — it installs inside the fuel tank in the factory pump location. In-tank mounting keeps the pump submerged in fuel at all times — the fuel acts as a coolant for the pump motor, extending pump life and ensuring reliable operation even at low fuel levels. In-tank pumps are also quieter than in-line alternatives and maintain the factory fuel system layout. The GSS340 is designed to replace the factory in-tank pump using the factory fuel pump hanger — a direct-fit installation in many applications, or a universal installation using an aftermarket hanger in custom applications.

Specifications:

• Brand: Walbro / TI Automotive
• Part Number: WALGSS340G3
• Barcode: GSS340G3
• Model: GSS340 Generation 3
• Flow Rate: 255lph (at high pressure)
• Type: In-tank, high pressure
• HP Support: 500HP+ (gasoline)
• Application: Universal
• Origin: Made in USA (Caro, Michigan)
• Weight: 0.9 lbs (pump only)

Fitment Information:

• Universal — compatible with a wide range of vehicles using the correct fuel pump hanger, wiring, and fuel line connections
• Direct-fit replacement for many popular applications — verify direct-fit compatibility for your specific vehicle before ordering
• For custom or non-direct-fit applications, an aftermarket fuel pump hanger and wiring harness are required — available separately
• Note: Verify fuel compatibility for your specific fuel type (E85, methanol, racing fuel) before ordering — the GSS340 is rated for gasoline applications. For E85 or methanol applications, verify TI Automotive's current E85 compatibility rating for the GSS340G3. A fuel pump installation kit (strainer, wiring harness, and fittings) is recommended for a complete installation — available separately.

What's Included:

• Walbro / TI Automotive GSS340 Gen 3 in-tank fuel pump (WALGSS340G3)
• Refer to TI Automotive's product documentation for complete kit contents — a fuel pump installation kit with strainer, wiring, and fittings may be required and is available separately

Installation Notes:

• Professional installation by an experienced fuel system specialist recommended — fuel pump replacement requires correct fuel system depressurization, correct wiring connections, and correct fuel line connections before the fuel system is pressurized
• Replace the fuel pump strainer (sock filter) during installation — a new strainer is essential for correct pump operation and longevity
• Verify correct wiring polarity before installation — reversed polarity will damage the pump immediately
• Prime the fuel system before the first start — cycle the ignition on and off several times to build fuel pressure before cranking the engine
• Check for fuel leaks at all connections after installation and after the first heat cycle
• A fuel pump installation kit (strainer, wiring harness, and fittings) is strongly recommended for a complete, correct installation — available separately from TI Automotive and aftermarket suppliers

Why Walbro / TI Automotive?

TI Automotive has been building fuel pumps and fuel system components under the Walbro brand name for over 60 years — a heritage of reliability, performance, and first-time fit that makes Walbro the most trusted name in performance fuel pumps. TI Automotive's fuel pumps are manufactured at their Caro, Michigan plant by union workers — never outsourced to a third party or assembled from outside components. The GSS340 is the most proven 255lph performance fuel pump in the aftermarket — a pump that has been trusted by performance builders, professional tuners, and motorsport teams for decades. For performance builds that need a reliable, proven 255lph high-pressure in-tank fuel pump, the Walbro GSS340 is the definitive choice.

Perfect For:

• Turbocharged and supercharged performance builds targeting 300–500HP on gasoline where the factory fuel pump's flow capacity is insufficient and a proven 255lph high-pressure in-tank upgrade is required
• Engine swaps and custom builds where a universal high-pressure in-tank fuel pump is required for the fuel system design
• Performance builds where TI Automotive's proven manufacturing quality, USA origin, and 60+ year fuel pump heritage are the correct choice for a critical fuel system component
• Direct-fit factory pump replacement on a wide range of popular performance platforms where the GSS340 is a known direct-fit upgrade

Note: Universal pump — verify direct-fit compatibility or source correct hanger for your application. Verify fuel type compatibility (E85, methanol) before ordering. Replace fuel pump strainer during installation. Fuel pump installation kit recommended — available separately. Prime fuel system before first start. Check for leaks after installation.