The Black Market Parts E9X/E8X Modular Bucket-less Fuel Pump is designed for performance enthusiasts seeking to run all blends of E85. Each pump option includes Genuine Walbro fuel pumps—either the 450 (F90000274), 525 (F90000285), or 535 (F90000295)—capable of flowing up to 350% more fuel than the factory fuel pump, with full E85 compliance. Each pump ships pre-assembled with an OEM connector for easy installation into the factory fuel pump top hat.

Stage Options

Stage 2 (3.6 liters per minute): This setup features a single Walbro 450 (F90000274) fuel pump, supporting up to 600whp (rated for 550whp on 100% E85). It’s ready for future growth with an open expansion slot to accommodate our Stage 3 or Stage 3.5 modules.
Stage 2.5 v2 (4.8 liters per minute): Equipped with a single Walbro 535 (F90000295) fuel pump, this option supports up to 650whp (rated for 575whp on 100% E85) and offers future expandability with our Stage 3 or Stage 3.5 modules.
Stage 3 (7 liters per minute): This pump includes all necessary wiring and a pump activation switch (Hobbs switch), featuring dual Walbro 450 (F90000274) pumps. It supports up to 1050whp* (rated for 875whp on 100% E85) and is ready for modular upgrades with our Stage 3.5 or Stage 4 modules.
Stage 3.5 (7.5 liters per minute): This configuration combines a primary Walbro 450 (F90000274) and a secondary Walbro 525 (F90000285), delivering maximum flow without expensive pump controllers. It supports up to 1,150whp* (rated for 975whp on 100% E85) and can be expanded with our Stage 3 or Stage 3.5 modules.
Stage 3.75 v2 (8.2 liters per minute): This pump includes all necessary wiring and a pump activation switch (Hobbs switch), featuring a Walbro 535 (F90000295) as the primary and a Walbro 525 (F90000285) as the secondary. It supports up to 1,200whp* (rated for 1,000whp on 100% E85) and is designed for performance growth.

Important Considerations

While all bucketless fuel pumps offer .2gpm more than traditional bucket designs retaining the venturi, they should not be driven with tanks lower than ¼ full and are not suitable for road course racing. This limitation applies to all bucketless systems, not just ours. If you do not plan on road course racing and maintain responsible fuel levels during spirited driving, this is the perfect pump for you.

Specifications

Factory BMW Pump:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: NOT COMPATIBLE
- Horsepower Supported 100% E85: NOT COMPATIBLE
Stage 2:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: 600
- Horsepower Supported 100% E85: 550
Stage 2.5 v2:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: 650
- Horsepower Supported 100% E85: 575
Stage 3:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: 1,050*
- Horsepower Supported 100% E85: 875*
Stage 3.5:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: 1,150*
- Horsepower Supported 100% E85: 975*
Stage 3.75 v2:
- Pump flow 72psi (5bar): XXX GPM
- Horsepower Supported Pump Gas: 1,200+*
- Horsepower Supported 100% E85: 1,000+*