I have replaced in-tank fuel pumps a number of times on different vehicles, but not yet on an E-Series. The number one challenge around these parts is rust related. So much breaks or is too rusted to re-use. The second challenge is the task itself. None are easy. There is "A Pain" and "A Curse".
On a rare few cars, you are able to change the pump via a trap door in the vehicle's floor under the passenger seat, or from in the trunk. I recall they were European cars.
It most often starts out bad from the get-go. The tank is full of gas but the pump is dead, and there is anti-siphon protection in the fill tube.
