I have replaced fuel pumps. This involves a lot of work and often a specialty wrench. You will usually need to drop the fuel tank, which requires at a minimum raising the vehicle over 18" into air. The standard 14" jack/stands solution most motorists own is insufficient. They need to be replaced mostly because their integrated fuel filter gets clogged by the sediment accumulated at bottom of the tank, which causes the motor to fail. When the tank has plenty of fuel, the gunk at the bottom of the tank is less likely to be ingested by the system.