turn the black collar anti clock to release filter,you may have to un plug the water sensor on the bottom of filter,filter should pull down,when fitting new filter would fill with clean diesel and take note of the three square locating indents on the collar of the filter,feel up into the filter housing and you will feel the recesses for these,you know when it is correctly fitted when the locking collar clicks into place,refit water sensor and if you have filled with diesel you should have no problems with drawing air,good luck
cdc
October 2011