Spool FX-350 Upgraded High Pressure Fuel Pump System | KIA STINGER

What is the FX-350?

Introducing the Spool Performance FX-350, the next evolution of high-pressure fuel pump technology for the Kia Stinger 3.3T. Designed as a major step up from our previous FX-200, the FX-350 delivers significantly higher pressure, increased flow, and improved efficiency—unlocking the fueling headroom required for serious power.

Enhanced Pressure & Flow
The FX-350 is engineered to deliver fuel at an impressive 35 MPa, a substantial increase over the factory pump’s limitations. Based on the fundamental relationship Q = P × A (where flow rate increases with pressure across a fixed injector area), the added pressure dramatically increases injector throughput.
In real-world terms, the FX-350 allows your injectors to flow up to 40% more fuel before reaching injection window limits—critical for higher boost, larger turbochargers, and ethanol blends.

Improved Fuel Atomization
Higher rail pressure results in finer fuel atomization, which is especially important in direct-injected engines like the Stinger’s 3.3T. Smaller fuel droplets mix more evenly with air, producing a more complete and efficient burn. The result is more power, improved combustion stability, and cleaner operation, particularly under high load and high boost conditions.

The FX-350 represents a no-compromise fueling solution for Stinger owners pushing beyond stock limits.

Why do you need it?

The factory high-pressure fuel pump on the Kia Stinger 3.3T becomes a major bottleneck as power levels rise. Whether you’re running higher boost, upgraded turbochargers, or ethanol blends (E30–E85), stock fueling quickly runs out of headroom.

The FX-350 increases effective fueling capacity by up to 90%, dramatically raising the ceiling of what the platform can support and enabling:

• Larger turbochargers

• Higher boost pressures

• Increased ethanol content

• Safer air-fuel ratios at high RPM and load

If you’re chasing real power, this pump is not optional—it’s foundational.

What does the kit include?

• 1× Spool Performance FX-350 upgraded high-pressure fuel pump

• 1× Ethanol Content Monitor kit with mobile app

• 1× Bosch-spec 10-micron high-flow fuel filter

• Upgraded fuel lines and all required installation hardware

• Spool 10-micron filter unit

Spool 10-Micron Filter Unit

Our 10-micron fuel filter provides industry-leading filtration with no measurable pressure drop on the low-pressure side. It plays a critical role in protecting both the high-pressure pump and injectors from debris, ensuring long-term reliability—especially when running ethanol-based fuels.

Highly recommended for any upgraded fueling setup.

Spool Ethanol Content Monitor

The Spool Ethanol Content Analyzer (ECA) provides real-time monitoring of:

• In-tank ethanol percentage

• Fuel temperature

Data is transmitted via BLE 4.0 low-energy Bluetooth to the Spool mobile app, allowing seamless connection without interrupting other Bluetooth devices.
All fuel lines included in the kit feature black nylon-coated, braided PTFE cores and are 100% E85 compatible.