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Fuel-supply pump
The fuel-supply pump in the low-pressure stage (the so-called pre supply pump) is responsible for maintaining an adequate supply of fuel to the high-pressure components. This applies irrespective of operating state, with a minimum of noise, at the necessary pressure, and throughout the vehicle’s complete service life.
The fuel-supply pump draws fuel out of the fuel tank and conveys it continuously in the required quantity (injected fuel quantity and scavenging flow) to the high-pressure fuel injection installation (60...500 l/h, 300...700 kPa or 3...7 bar). Many pumps bleed themselves Automatically so that starting is possible even when the fuel tank has run dry.
There are three designs:
Electric fuel pump (as used in passenger cars)
Mechanically driven gear-type supply pumps, and
Tandem fuel pumps (passenger cars, UIS)
In axial-piston and radial-piston distributor pumps, a vane-type supply pump is used as presupply pump and is integrated directly in the fuel-injection pump.


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