my bmw keeps burning out fuel pumps on 1993 BMW 325i

my 325i has smoked the last three fuel pumps after running for a short period of time .the last fuel pump lasted about 20 minutes i volt tested wire at the fuel pump and it had 14 volts

Asked by for the 1993 BMW 325i
How about the fuel pump relay? Is the fuel tank clean inside? Is the filter new?
Is the ground connection also good?