General Information

• Brand: Bosch

• Type: High-Pressure / High-Flow Fuel Pump

• Series: The "044" family (often generically referred to as a "Bosch 044").

• Application: Primarily designed for high-performance motorsport applications, forced induction (turbo/supercharger) engines, and as a common upgrade for vehicles requiring higher fuel flow than the stock pump can provide.

Technical Specifications

• Part Number: 0 445 010 118

• Operating Pressure: Nominal 5 Bar (approx. 72.5 psi). It is designed to handle high boost pressure applications.

• Flow Rate: This is the most critical spec.

• At 5 Bar (72.5 psi): Approximately 200 Liters per hour (L/hr) .

• At 3 Bar (43.5 psi): Flow is higher, around 240-250 L/hr.

• Voltage: 12V (Nominal automotive voltage).

• Construction: Robust, all-metal construction (often a nickel-plated steel can) designed to withstand harsh environments and cavitation. It is an "immersed" pump, meaning it is designed to be installed inside the fuel tank (though it is often used inline as well, with proper precautions).

Common Applications / Vehicle Fitment (OEM)

While primarily an "uprated" pump for tuners, it was used as original equipment in some high-performance vehicles, including:

• Porsche 911 Turbo (996/997)

• Ferrari (various models, often as a lift pump)

• Audi RS4 / RS6 (B5 and C5 generations)

Important Considerations

• Fuel Compatibility: While Bosch states it is compatible with many fuel types, you must check for Ethanol (E85) compatibility. The internal components may degrade over time with high concentrations of ethanol unless specifically rated for it.

• Installation: It is a "bare" pump. To install it in a vehicle, you will typically need an aftermarket installation kit (which includes a filter sock, rubber sleeve, and wiring harness) to fit it into a standard fuel pump hanger.

Here are the specific structural advantages that set it apart:

1. The "Can" Construction: Nickel-Plated Steel vs. Crimped Tin

• Advantage: High Tensile Strength and Rigidity.

• Why it matters: Most OEM pumps are housed in thin, crimped (folded) sheet metal to save money. The 044 uses a thick-gauge, deep-drawn steel can that is welded (not crimped) at the base and top. This rigid housing prevents the internal components from distorting under high pressure (internal stress) or high external clamping force. It also resists deformation if the vehicle is in a crash or the tank is impacted.

2. The Roller Cell Pump Element

• Advantage: Hydraulic Efficiency and Abrasion Resistance.

• Why it matters: Inside, the pump uses a "roller cell" or "peripheral" pump design.

• Hardened Components: The rotors and the liner are made from hardened steel or sintered metal.

• Rollers: Instead of plastic or composite vanes (which wear out), the 044 uses small, precision-ground steel rollers. As the rotor spins, centrifugal force pushes these steel rollers against the liner. This creates multiple sealed chambers that move the fuel.

• Result: This metal-on-metal (with fuel lubrication) construction is incredibly resistant to wear from contamination and can handle cavitation (vapor bubbles) much better than a plastic vane pump, which would shatter or melt.

3. High-Temperature Armature and Magnets

• Advantage: Thermal Stability and Demagnetization Resistance.

• Why it matters:

• Magnets: The pump uses high-grade ferrite or rare-earth magnets that are specifically designed to resist demagnetization at high operating temperatures (common in tanks with low fuel or in-line hot fuel transfer).

• Winding Wire: The copper windings in the electric motor are insulated with high-temperature enamel, allowing the pump to run hot without shorting out (burning up) under sustained high load.

4. The "Turbine" Pre-Stage (Hydraulic Design)

• Advantage: Vapor Suppression (Cavitation Resistance).

• Why it matters: High-performance engines create extreme suction at the pump inlet. If the pump cannot fill its own chambers fast enough, it creates vapor bubbles (cavitation), which destroys pumps. The 044 features a sophisticated inlet design and internal flow paths specifically engineered to handle low inlet pressure (suction) without cavitating. This allows it to be used as a "lift pump" from the tank or as a main pump under high boost where fuel tanks are pressurized.

5. The Check Valve

• Advantage: Heavy-Duty Sealing.

• Why it matters: The one-way check valve at the outlet (which prevents fuel from draining back to the tank when the pump is off) is a robust, spring-loaded metal or high-grade plastic component. It is designed to hold back the pressure of a high-pressure fuel system for a long time, whereas cheaper pumps' check valves often fail quickly, causing long cranking times on startup.

  
  

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