Dorch Low Pressure Fuel Hose (Flex Fuel ECA Fitment) - Gen 1 B58
Ships from the brand or distributor, usually in 3–7 business days
Make sure this fits your car
Fits: Gen 1 B58 (through 2019): BMW M140i, M240i (F22), 340i (F30), 440i (F32), 540i (G30), 640i GT (G32), 740i (G11), X3/X4 M40i (G01/G02). Not for Gen 2.
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- 30-day returns on unused parts
- Fitment help before you buy
This hose set adds an ethanol sensor to a Gen 1 B58's low-pressure feed. It works with any 3/8 in ethanol sensor and with the stock pump or any Dorch pump. It's the hose half of a flex fuel setup, for when you already have a sensor or are building your own.
What you get
- Triple-layer hose: PTFE-lined, stainless braided, with a black PVC jacket and crimped ends.
- Anodized aluminum fittings with double O-rings.
Good to know
- Pick your pump (stock/B58TU, DS1/DS15/DS2, DS25 side inlet, or DS25/DS3 front inlet) and your chassis group.
- It routes so the sensor tucks under the factory insulation and engine covers.
- Fits Gen 1 B58 cars through the 2019 model year: M140i, M240i (F22), 340i (F30), 440i (F32), 540i (G30), 640i GT (G32), 740i (G11) and X3/X4 M40i (G01/G02). It does not fit 2020+ (Gen 2) B58 cars.
Brand: Dorch Engineering · Part #: 581-TUA-ECA, 581-TUB-ECA, 581-TUC-ECA, 581-OGA-ECA, 581-OGB-ECA, 581-OGC-ECA, 581-45A-ECA, 581-45B-ECA, 581-45C-ECA, 581-90A-ECA, 581-90B-ECA, 581-90C-ECA
Gen 1 B58 (through 2019): BMW M140i, M240i (F22), 340i (F30), 440i (F32), 540i (G30), 640i GT (G32), 740i (G11), X3/X4 M40i (G01/G02). Not for Gen 2.
| 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 | |
| X4 M40i | G02 | 2019 | Gen 1 B58 | |
| 640i GT | G32 | 2018–2019 | Gen 1 B58 | |
| M340i | G20/G21 | 2019–2024 | Gen 2 B58 (TU) | |
| M440i | G22/G23/G26 | 2021–2024 | Gen 2 B58 (TU) | |
| M240i | G42 | 2022–2024 | 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) | |
| X4 M40i | G02 | 2020+ | Gen 2 B58 (TU) | |
| X5 xDrive40i | G05 | 2019–2023 | Gen 2 B58 (TU) | |
| X6 xDrive40i | G06 | 2020–2023 | Gen 2 B58 (TU) | |
| X7 xDrive40i | G07 | 2019–2022 | Gen 2 B58 (TU) | |
| 840i | G14/G15/G16 | 2019+ | Gen 2 B58 (TU) | |
| INEOS Grenadier | Station Wagon/Quartermaster | 2023+ | Gen 2 B58 (TU) | |
| M340i | G20/G21 | 2025+ | Gen 3 B58 (48V) | |
| M440i | G22/G23/G26 | 2025+ | Gen 3 B58 (48V) | |
| M240i | G42 | 2025+ | Gen 3 B58 (48V) |
Not sure? Email sales@b58racing.com with your VIN.
- Ships from the brand or distributor, usually in 3–7 business days.
- Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
- 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.
Guides for this part
B58 Fueling Explained: HPFP, LPFP, Port Injection, Flex Fuel and E85
The B58 fuel system has two pumps. The low-pressure pump (LPFP) in the tank feeds the high-pressure pump (HPFP) on the engine, which feeds the direct injectors. On a tuned car, the HPFP is usually the first wall, and eth
B58 HPFP Install: Gen 1 F-Chassis, Gen 2 B58TU and the GR Supra
The B58's high-pressure fuel pump (HPFP) bolts to the back of the valve cover, by the firewall. You disconnect the battery, bleed off the pressure by slowly cracking the 17 mm line nuts into rags, then remove the lines,
Best B58 Mods, In the Order to Do Them
Start with a tune. It is the biggest gain per dollar on any B58. Then add a downpipe and a Stage 2 map, then an upgraded high-pressure fuel pump (HPFP) and an ethanol blend. Only after that should you think about a bigge
Pairs well with
Dorch Low Pressure Fuel Hose (Replacement) - Gen 1 B58
Dorch Flex Fuel Ethanol Sensor (ECA) Kit - Gen 1 B58
Dorch Replacement Injector Seals - Gen 1 B58
