Patent ID: 7513240

Claim:
A high-pressure fuel feed pump, comprising a pump body; a pressurizing chamber formed in said pump body; an intake valve provided at an inlet of said pressurizing chamber; a discharge valve provided at an outlet of said pressurizing chamber; a plunger arranged to go into and out of said pressurizing chamber for pressuring a fuel in the pressuring chamber and discharging the fuel through said discharge valve; a low-pressure chamber formed in said pump body and separated from ambient by a metal housing fixed to said pump body; a first low-pressure fuel passage for conducting a low-pressure fuel therethrough; a second low-pressure fuel passage for conducting the low-pressure fuel from said low-pressure chamber to said intake valve; and a metal damper arranged in said low-pressure chamber and having two metal diaphragms bonded to a peripheral edge thereof; wherein outer surfaces of said two metal diaphragms are each exposed to an internal of the low-pressure fuel flow from said first low-pressure fuel passage to said intake valve.