SOURCE: the best way to change a 1989 mazda 626 fuel pump without a car lift
the fuel pump is under the back seat. you can lift the bottom of the seat forward and pull up the carpet and get to the fuel pump.
SOURCE: gtx mazda 323
Im not an expert by any means but it sounds like you are running out of fuel in the combustion chamber (or lean) and setting off the cars knock sensor. It seems to me there are several fuel pumps available on ebay eluding to the fact that they were a weak component. be extremely careful "pinging" is extremely BAD for the pistons and block. keep out of hard boost until you solve issue.
SOURCE: I have been told that I need to replace my fuel
located under the drivers dash heres a picture to help aid you. hope this helps
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