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From the Bosch Motorsport Fuel Pump Brochure

0 580 254 040 (Bosch 040), 102 l/h @ 6.5 bar

0 580 254 044 (Bosch 044), 200 l/h @ 5 bar

0 580 254 023 (Bosch 023), 168 l/h @ 5 bar (Rumoured to be the Nismo GTR upgrade pump)

But "Bosch Fuel Pumps have their flow rates defined in N-Heptane as part of their engineering specification. N-Heptane is a pure chemical and does not have the same viscosity and density as standard petrol. Hence the N-Heptane flow rate figures stated should be used as a general guide for comparison purposes only."

Other info I have gathered: (fwiw)

0580254040 (040)

Specs: 040

Flows 235LPH

Supply voltage 13.5V

Current consumption 13A

Weight 930g

Internal pump (only)

Connections:

Intake side M18 x 1.5

Pressure side M12 x 1.5

Electrical +:M6 / -:M5

Bosch Part Number - 0580254044 (044)

Specs: 044

Performance Operates: 325 LHP

Supply voltage 13.5V

Current consumption 13A

Weight 1030g

external pump (recommended)

Connections:

Intake side M18 x 1.5

Pressure side M12 x 1.5

Electrical +:M6 / -:M5

For reference: (via SK)

Std GTST pump is 135 litres per hour and supports 300 bhp at standard pressure

Std GTR pump is 190 litres per hour and supports 420 bhp at standard pressure

Bosch 910 pump is 200 litres per hour and supports 450 bhp at 73.5 PSI # 0 580 254 910

Bosch 975 pump is 228 litres per hour and supports 500 bhp at 73.5 PSI # 0 580 254 975

Bosch 984 pump is 228 litres per hour and supports 500 bhp at 73.5 PSI # 0 580 254 984

Bosch 040 pump is 235 litres per hour and supports 520 bhp at 73.5 PSI # 0 580 254 040

Bosch 044 pump is 330 litres per hour and supports 730 bhp at 73.5 PSI # 0 580 254 044

Hope it all helps.

Cheers

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