Mechanics

MAZDA PROTEGE GAS PROBLEM

2000 Mazda Protege • 210,355 miles

How does the fuel pressure regulator operate?
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Guest
November 13, 2012.



It essentially has a seat and a bell shaped piece that closes and opens over the gas flow. The vacuum that is attached to it changes the point at which it will allow more or less gas past this seat and bell, like a seat and needle in a carberater, dependent upon vacuum. It allows more gas with more vacuum.
This is on the return line of the fuel system after the injectors.