Barry-
No, the vehicle will not start without a working fuel pump. The fuel injectors need liquid fuel to work, not fuel vapor. Once running, the fuel is not drawn in through a vacuum, it's all electronically driven by the fuel pump.
There is no drain plug on the fuel tank, so dropping it if it has more then 1/4 tank can be a bit of a chore. Nothing difficult, but just take your time and use a large piece of plywood on a jack to lower the tank, don't want the fuel to slosh around and tip the tank.
Strange that it started after sitting for 4 days. If my truck sits for a week without being started, as it often does, it's always a hard start because there is no liquid fuel in the fuel lines and the pump must first fill the lines before supplying the injectors.