Dorch DS25 High Pressure Fuel Pump Upgrade - Gen 1 B58

Past roughly stage 2 power on a Gen 1 B58, the factory high-pressure fuel pump can't keep up, especially on ethanol. Dorch's DS25 replaces it with a higher-flow pump at the same mounting point. It's the update to Dorch's earlier DS2, redesigned inside (pressure chamber, springs and plunger) and run at up to 250 bar.

What you get

• DS25 high-pressure fuel pump with mounting hardware.
• Dorch high-pressure line rated to 250 bar, to connect the pump to the fuel rail.
• Engine cover spacer and a plug-and-play adapter harness.

Flow, as Dorch rates it

• Gasoline: about 750 whp (about 1,000 whp with Dorch's +40% Lift Kit exhaust cam).
• E50: about 650 whp (880 whp with the cam).
• E85: about 550 whp (770 whp with the cam).

Good to know

• Dorch's kits are built as a drop-in for the factory pump position: the hoses follow the OEM routing, nothing is cut or bent, and the DME keeps full control of the pump. Each kit comes with Dorch's own high-pressure line to the fuel rail instead of reusing the factory line, and Dorch backs its pumps with a lifetime warranty.
• The pump needs software that supports it. Dorch's in-house calibration team supports its pumps, so tell your tuner which pump you're running.
• 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 #: DE-581-25E

• 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.