my 2.2hdi wont start when i turn on the ignition i cant hear the pump running so i tried directly to the battery and it worked so tried it again off the ignition no joy ran a test from the plug on the filter to the plug on the pump the negative was ok but the positive there was nothing can anyone help me .this happen about a fortnight ago but changed the filter and charged the battery and it started happened again last week while shopping but finally it started got it home and now it will not start