2004 Vauxhall Zafira wont start after taking diesel filter off and puting it back on still full of diesel

its probaly an air lock between the filter and the pump trace the pipe from the pump to the filter disconnect the pipe at filter then you need to fill the pipe with fuel (very fiddley personaly i use a small syringe that you use to give children meds) them make sure the filter is filled with fuel and that you battery is fully charged then it should start