Stage 1 LPFP Fuel Pump Kit with Walbro 255 GSL392 Inline Pump for BMW 135i, 1 Series M Coupe, 335i(x) N54/N55 E-Series
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At higher power levels, one of the first limitations encountered on virtually all turbocharged BMW engines is the fuel supply system.
One of the most cost-effective and efficient upgrades is improving the low-pressure fuel pump (LPFP), which delivers fuel from the tank to the high-pressure fuel pump in the engine bay.
Product Overview
The Stage 1 Low-Pressure Fuel Pump (LPFP) Upgrade Kit offered here is based on a genuine Walbro 255 (GSL392) inline fuel pump, which is installed in series with the factory fuel pump. This configuration increases the overall fuel flow by approximately 50%.
Features
- Complete kit for installing the Walbro GSL392 inline pump in series with the factory OEM fuel pump.
- Recommended for vehicles producing up to 600 HP.
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Includes:
- OEM-quality fuel line, fully compatible with E85 fuel.
- Fuel-resistant wiring harness.
- High-quality wiring adapters for the Walbro fuel pump.
- Plug-and-play fittings for a precise and straightforward installation.
- Compatible with all BMW E-Series models equipped with N54 and N55 engines.
- Compatibility with BMW F-Series models is currently under evaluation.
Our Recommendation
Before upgrading, we recommend verifying the performance of the factory fuel pump by reviewing an MHD data log and monitoring the Low Pressure Fuel Pump parameter.
If fuel pressure drops significantly below 60 PSI (approximately 4 bar) under full load, the factory pump should either be replaced or upgraded to our Stage 2 LPFP kit.
To help you choose the right fuel pump upgrade, keep an eye on our blog. We will soon publish a detailed article explaining the N54 fuel system and the differences between the available upgrade options.
Important Notice
Vehicle manufacturers and model names are used solely to identify the intended application and confirm vehicle compatibility.
Unless the product description specifically states that a Parts Approval Certificate (Teilegutachten), TÜV certificate, or ABE (General Operating Permit) is included, the product is supplied without road approval for use under German traffic regulations (StVZO).
In such cases, an individual inspection and approval in accordance with §21 StVZO is required before the product can be legally used on public roads.
For additional information, please feel free to contact us.