There is no average life span for the fuel pump. It can last forever, or go bad in a week, and anywhere in between.
The automatic transmission is a little different in life span as how the owner treats the car, how many mods are on the car, driving style, etc can make a big difference in how long the transmission lasts. However, like the fuel pump the trans can last a week or the life of the car.
As an example, my 90 camaro dd has the original 700r4 automatic, fuel pump was changed in 2005, was the original that I replaced, and has held up for 8 years now.
The automatic transmission is a little different in life span as how the owner treats the car, how many mods are on the car, driving style, etc can make a big difference in how long the transmission lasts. However, like the fuel pump the trans can last a week or the life of the car.
As an example, my 90 camaro dd has the original 700r4 automatic, fuel pump was changed in 2005, was the original that I replaced, and has held up for 8 years now.