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Spool Stage 3 Low-Pressure Fuel Pump — N55 (F-chassis)
SPOOL PERFORMANCE

Spool Performance Stage 3 Low-Pressure Fuel Pump — N55 (F-Chassis)

$935.00

Spool Performance Stage 3 low-pressure fuel pump for the F-chassis N55 — the in-tank side that keeps a Stage 3 build fed. A bigger high-pressure pump is only as good as what feeds it; the factory in-tank (low-pressure) pump runs out of duty on E85 and high boost, and rail pressure drops up top. Spool's Stage 3 adds a boost-activated secondary in-tank pump, roughly doubling low-pressure flow.

What it is

A twin-pump in-tank upgrade: the factory pump plus a second pump that switches on under boost — it ships with Spool's Hobbs (boost) switch for activation, so cruise stays factory-quiet and the system only ramps when you're on it. Spool rates it to support 1,200+ whp, and it's a complete drop-in replacement.

Where it fits in the build

Low-pressure (in-tank) side; it pairs with an upgraded high-pressure (DI) pump so the HPFP is never starved. We tune the engine to the fuel system.

Fitment

BMW N55 (F-chassis) — F20/F21 M135i, F22/F23 M235i, F30 335i, F32/F33/F36 435i, F87 M2. Confirm your chassis in the selector.

Sourcing fueling with the tune? The Fueling Kit — N55 bundles the matched parts + calibration for 8% under à la carte.

Fits engine N55
Fits chassis F22 · F30 · F32 · F87
Category Fuel
Manufacturer Spool Performance

Ships from Boca Raton, FL.

WHY WE SHIP SPOOL PERFORMANCE
Spool Performance builds high-pressure fuel pumps for the builds that have outrun what the factory pump can flow. On a big-power direct-injection BMW, fuel supply is often the actual ceiling, and the engine will pull rail pressure long before it runs out of airflow. We ship Spool because their HPFP upgrades are aimed squarely at that ceiling, restoring the supply margin a high-output calibration depends on. This is upper-end fueling hardware — the part you add when the dyno shows the pump, not the turbo, is what is holding the number back.