Even though you are being pretty rude to Peter, I'll help you out.
The idea that pressure cannot be different in the fuel rail at different locations is simply not true. If things were completely static, I'd say that the pressure would be damn near constant at any point in the rail. Thing is, there is flow. There is flow through the rail and there is flow though the injectors. This flow is not constant and the FPR does not necessarily react instantaneously to pressure changes in the rail. The injectors open and close which causes pressure waves through the rail. These pressure waves can cause all sorts of freaky things to happen in the rail in the same way that valves opening and closing cause flow and pressure changes in an intake manifold. Though you would generally analyze the system with the fluid being non-compressible, but there are more factors at play here, such as the momentum of the fluid. An analogous system would be the piping in a house. Here is a little info on hydraulic shock (water hammer.)
http://en.wikipedia.org/wiki/Water_hammer
You also don't design manifolds for water distribution in such a way that multiple near simultaneous consumers are teed off sequentially because there would be a pressure drop at the end. This can be mitigated by having multiple feed locations to a manifold and by making your manifold larger so that it acts as a pressure reservoir.
FYI, there are fluctuations in air pressure in a single tire when the system isn't perfectly static, just as there are pressure differences inside your intake manifold when there is flow.
Now next time you should simply ask "why is that?" instead of thinking you know everything and smacking down someone that is only trying to help, especially when you already recognize that they are an expert in their field.