Walbro 255 fuel pump Performance Parts & Modifications

If you’re starting to push more power from your engine, especially with a turbo or supercharger, the factory fuel pump can quickly become a bottleneck. That’s where the Walbro 255 steps in. Known worldwide for reliability and consistent performance, this pump has become the go-to upgrade for enthusiasts who need more fuel flow without overcomplicating their setup. Flowing an impressive 255 litres per hour and supporting roughly 550 horsepower, it delivers the fuel volume your engine needs to stay safe and consistent under boost or heavy throttle. It’s a simple, proven solution that gives you confidence your fuel system is keeping up with your performance goals.

What makes the Walbro 255 so popular is how much it improves over a standard OEM pump. Where a factory pump starts to struggle at higher loads, the Walbro maintains stable flow and pressure, reducing the risk of leaning out or fuel starvation. It’s also designed for real performance use, with strong internals, reliable operation, and a design that performs just as well in daily-driven setups as it does in track or drift builds. At Empire Performance, we see customers choose the Walbro 255 because it’s one of those rare upgrades that’s affordable, trusted, and genuinely delivers results.

Another big advantage is fitment. The GSS342, the most common variant we supply, is an in-tank pump with a 38mm diameter, which means it fits into most factory canisters with no modification. The inlet sits inline with the outlet, and the pump comes with a full fitting kit, making installation straightforward whether you’re upgrading at home or getting it done professionally. And because we only stock genuine Walbro pumps, you don’t have to worry about the counterfeit issues that are common online - you get the real thing, ready to support your build safely and reliably. If you’re planning more power or simply want peace of mind, the Walbro 255 is one of the smartest early upgrades you can make.

Choosing the Right Walbro 255 Pump

Choosing the right fuel pump isn’t just about grabbing whatever flows the most. It’s about matching the pump to your setup so the whole fuel system works together reliably. The Walbro 255 is popular because it strikes that perfect balance: big enough to support serious power, yet compact enough to drop into most factory canisters without drama. The GSS342 model we supply is the most common choice for in-tank applications thanks to its 38mm diameter, inline inlet/outlet design, and broad compatibility across a huge range of Japanese and performance vehicles. If your current pump is starting to fall behind or your tuner has mentioned fuel pressure dropping under load, this is the pump that solves the problem before it becomes an issue.

Of course, different variants of the 255 exist, like the GSS341 and GSS342, and the main difference is the orientation of the inlet. Most cars use the GSS342 because the strainer attaches directly to the inlet and lines up with the factory basket. That’s why we stock and recommend it for the majority of builds. When upgrading, it’s also worth considering whether your setup needs supporting mods such as a wiring upgrade kit or an adjustable fuel pressure regulator, especially if you’re running higher boost or ethanol blends. And if you’re comparing the 255 to newer high-flow pumps like the 450 or 525, the choice often comes down to how far you plan to push the car. For many street and track builds, the 255 still hits the sweet spot between cost, performance, and ease of fitment.

At Empire Performance, we help customers choose the right pump based on their exact vehicle and power goals, not just what’s trending online. We know the fitment quirks of different platforms, the tuning considerations, and which supporting parts are actually worth adding. Whether you’re planning a mild upgrade, a turbo conversion, or preparing the car for a dyno tune, we’ll make sure you’re getting the pump that suits your build and keeps everything running safely.

Installation, Reliability & Ownership

Installing a Walbro 255 is generally a straightforward job, especially since the GSS342 drops into most factory fuel canisters with no modification. The included fitting kit gives you everything you need, including clamps, strainer, wiring pigtail, making it a clean swap for DIY installers with some mechanical experience. That said, because the fuel system is such a critical part of your engine’s reliability, many owners prefer to have the pump installed professionally, especially if tuning will follow. A proper install ensures correct hose routing, secure electrical connections, and stable fuel pressure once the engine is under load.

One thing many people notice after upgrading is the sound. Walbro pumps are known for being slightly louder than stock, particularly at idle. It’s completely normal and just part of the design. More importantly, they’re built to last. When fed clean fuel and installed correctly, a Walbro 255 offers years of dependable service even in hard-driven or boosted applications. Regular checks of the fuel filter and ensuring the tank stays clean go a long way toward keeping the pump healthy.

In some builds, installing a higher-flow pump may require a tune, especially if the increased flow affects your fuel trims or base pressure. Your tuner will tell you what’s needed for your specific setup. And because counterfeit pumps are unfortunately common online, buying from a reputable supplier matters more than ever. At Empire Performance, we only sell 100% genuine Walbro pumps, so you know you’re getting the real GSS342 - the one that actually performs, supports 550hp, and won’t fail prematurely. Whether you’re chasing reliability, prepping for boost, or upgrading before your next dyno session, the Walbro 255 remains one of the best-value fuel system upgrades you can make.