BMW Gen 2 B46 & B48 Spool FX-350 Upgraded High Pressure Fuel Pump

The Spool FX-350 high pressure fuel pump for Gen 2 BMW B46 and B48 engines delivers FX200-level volume at 350 bar, the missing piece for big-power DI-only builds.

Why you need it

The stock pump limits how far a Gen 2 B46/B48 can go on direct injection alone. The FX-350 uses stainless steel construction with a high-tolerance DLC-coated piston and bore, and its plunger springs are matched to Spool's Gen 2 high lift cam lobe mod to limit float at high rpm. Paired with Spool IFX350 Gen 2 DI injectors, it covers the high pressure side.

Fits

• BMW Gen 2 B46
• BMW Gen 2 B48

What's included

• Spool FX-350 high pressure fuel pump
• Mounting bracket
• Pump alignment tool
• Triple-layer low pressure line (nylon over stainless over PTFE)
• Plug and play HPFP adapter harness
• Spool 10-micron filter unit (if selected)
• Spool wireless ethanol analyzer kit (if selected)

Good to know

Choose at checkout whether to add the wireless ethanol analyzer, use the Spool analyzer you already have, or skip it, and whether to add the 10-micron filter unit. Tune changes are required to run the pump, and Spool can help your tuner with the needed changes. Run an upgraded low pressure fuel pump so the FX-350 gets enough supply. Professional installation is recommended.