Vapor lock preventing mechanism in motor-driven fuel pump

Details Vapor lock preventing mechanism in motor-driven fuel pump Vapor lock preventing mechanism in motor-driven fuel pump

1989-10-31

1991-04-23

Michalsky, Gerald A.

Pumps

Successive stages

415 551, 415 555, F04D 900

Patent

active

050095757

ABSTRACT:
A multi-stage motor-driven fuel pump including a motor section provided with an electric motor and a pump section to be driven by the electric motor, the pump section having a plurality of pump chambers partitioned by intermediate plates and communicated with each other by a fuel communication hole formed through each of the intermediate plates. A ratio of a sectional area of the fuel communication hole of any one of the intermediate plates between adjacent ones of the pump chambers to a sectional area of the pump chamber on a lower pressure side is set in a predetermined range such that a gradient of fuel pressure increase in the pump section is increased to early prevent vapor lock.

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