I have just replaced the Auto box in my 300 TDI got everything back together now the thing wont start, we seem to have intermittent fuel issues, one minute its getting fuel the next its not, but when it is we have fuel at the injectors, the engine turns, but it wont start?? it seem like it wants...

My 300tdi auto gearbox will only select reverse, figured it may be easier to put in another box than overhaul the existing box and change the seals, has anyone else had this problem & tried to tackle it? Any advice would be much appreciated Thanks in advance Tony.