Spool FX-170 HPFP Kit [M133]

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• You must return the ordered products within 14 days of receiving
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Pre order / made-to-order products

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If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

Spool FX-170 HPFP Kit | AMG M133

The Spool Performance FX-170 is a high-pressure fuel pump (HPFP) performance upgrade for Mercedes-AMG M133 engines. This solution is designed to eliminate the fuel limitations of the stock system, enabling significantly higher power potential in tuned configurations.

What is the FX-170?

The FX-170 is an upgraded HPFP featuring a larger cylinder bore than the stock pump. This delivers approximately +50% more fuel flow.

• +50% flow compared to stock
• Full E85 compatibility
• Plug & Play installation: no cutting or wiring modifications
• Enables increased fuel delivery for higher power levels

The added capacity allows for:

• Higher ethanol blends
• Larger turbochargers
• Higher power levels

Why is an upgrade necessary?

The M133 engine's stock HPFP limits performance when tuning:

• Insufficient fuel supply for higher power
• Limited ethanol usage

The FX-170:

• Significantly increases fuel system capacity
• Enables more effective and safer tuning
• Supports demanding turbo and ethanol setups

Package Contents

• 1 x FX-170 High-Pressure Fuel Pump
• Upgraded fuel lines + installation hardware
• Bosch 10-micron high-flow fuel filter
• Ethanol content measurement system (optional, with mobile app)

Spool 10-micron filter

• Excellent filtration performance without significant pressure loss
• Protects HPFP and injectors from contaminants
• Recommended addition for high-power setups

Spool Ethanol Content Monitor (optional)

• Real-time display of ethanol content and fuel temperature
• Connectivity to mobile app (BLE 4.0)
• Enables precise fuel mixture control
• Full E85 compatibility for fuel lines

Software Requirements

The FX-170 requires software modifications:

• Calibration must be done before commissioning
• Operating without adjustment can cause damage and void warranty

Spool:

• Provides calibration data to the tuner
• Helps find an experienced tuner

Note: Spool does not offer ready-made custom tunes

Important Note: LPFP

The low-pressure fuel system is critical:

• Insufficient LPFP can damage the HPFP and injectors
• HPFP lubrication relies on fuel flow
• Lack of fuel → wear and failure

Recommendation: ensure adequate low-pressure side upgrade