Spool Split Fuel Surge Tank
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: Universal: for B58 and S58 fuel and port-injection builds
- Free US shipping over $250
- 30-day returns on unused parts
- Fitment help before you buy
High-horsepower engines don’t just need more fuel — they need stable, predictable fuel control . The Spool Performance Split Fuel Surge Tank was designed specifically to solve the real problems that show up when direct injection and port injection are pushed hard. At high load, the factory high-pressure fuel pump for direct injection creates rapid pressure pulses on the low-pressure side of the system. When DI and PI share the same fuel supply, those pulses can travel through the fuel rail and cause unstable pressure at the port injectors , leading to inconsistent injector flow and tuning headaches. This is one of the most common causes of erratic PI behavior on high-power builds. Our split surge tank physically isolates the DI and PI fuel circuits .
Fits: Universal: for B58 and S58 fuel and port-injection builds
Brand: Spool Performance
Universal: for B58 and S58 fuel and port-injection builds
| Model | Chassis | Years | Engine | Fits |
|---|---|---|---|---|
| M140i | F20/F21 | 2016–2019 | Gen 1 B58 | |
| M240i | F22/F23 | 2016–2021 | Gen 1 B58 | |
| 340i | F30/F31/F34 | 2016–2019 | Gen 1 B58 | |
| 440i | F32/F33/F36 | 2017–2020 | Gen 1 B58 | |
| 540i | G30/G31 | 2017–2019 | Gen 1 B58 | |
| 740i | G11/G12 | 2016–2019 | Gen 1 B58 | |
| X3 M40i | G01 | 2018–2019 | Gen 1 B58 | |
| M340i | G20/G21 | 2019+ | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021+ | Gen 2 B58 (TU) | |
| M240i | G42 | 2022+ | Gen 2 B58 (TU) | |
| Z4 M40i | G29 | 2019+ | Gen 2 B58 (TU) | |
| GR Supra 3.0 | A90/A91 | 2020+ | Gen 2 B58 (TU) | |
| 540i | G30/G31 | 2020–2023 | Gen 2 B58 (TU) | |
| 740i | G11/G12 | 2020–2022 | Gen 2 B58 (TU) | |
| X3 M40i | G01 | 2020+ | Gen 2 B58 (TU) | |
| M3 | G80/G81 | 2021+ | S58 (BMW M) | |
| M4 | G82/G83 | 2021+ | S58 (BMW M) | |
| M2 | G87 | 2023+ | S58 (BMW M) | |
| X3 M | F97 | 2020–2024 | S58 (BMW M) | |
| X4 M | F98 | 2020–2025 | S58 (BMW M) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Free US shipping on orders over $250.
- Unused parts can be returned within 30 days. Some items are marked no-refund in their description.
Full details are on our shipping and returns page.
Pairs well with
Spool Auxiliary Split Fuel System - BMW S58
Spool Wireless Ethanol Analyzer Kit - Gen 1 B58
Spool Auxiliary Split Fuel System - GR Supra A90/A91
