[Snakebit]

I just had a carter mechanical pump crap out on me after 300 miles! Was able to nurse it home. Would have had to call a tow truck if it was electrical. A friend of mine who is a farmer and trucks his crops to Philly had an old ford box truck. The mechanical pump died so he replaced with an electric pump. The fuel pump dies on the Walt Whitman bridge. $1000.00 to tow the truck off the bridge!!! He took that electric pump and threw it as far as he could.
If you are running fuel injection, electric pumps have their place, and like they said, they are mounted in the tank. If you are running carbs, stick with the mechanical pump.