Which way’s up, or down?
I changed my Mikuni diesel heater’s Crossland 489 fuel filter, but it was not supplied with replacement seals so I refitted the old seals. However I have not been able to stop the filter unit from leaking despite reinstalling it four times. The leak seems to be coming from around the main seal which has unfortunately now broken, so I will have to get a replacement.
I think the filter cartridge has been inserted the right way up, because the wording on the cartridge is not upside down, so other than replacing the seals, where might I be going wrong? It seems quite a fiddly item to deal with, and should be easier to service unless I am making some fundamental error. DEAN HAWKEY, via email
TONY REPLIES: The 489 element is a throwaway unit that fits inside a removable metal bowl. The element has a small hole at one end for the centre securing bolt and a larger one at the other that fits against the cast alloy filter head. Normally the filter bowl hangs down and the centre securing bolt fits up from the bottom. This means that the small hole should be at the bottom with the large hole pushed up against the filter head. I think you have probably fitted the element upside down and it is preventing you pulling the bowl up against the seal in the head. You have probably also crushed the element so I would suggest a new one that should come with the required seals.