Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
The model is PAD's best one yet, but the engine starters are nothing short of a catastrophe! Neither autostart nor manual start works for me and I have no idea why. :/
The only thing I can think of is that your fuel pump switches are not on, it's easy to overlook them when doing a manual start.
May have been mentioned but I have manual start problems in FSX much more than in FS9 and the solution is usually to press Ctrl + Shift + F4 to open the fuel/mixture which despite my default flight setting can often re-set itself closed from one flight to the next. Give it a try.