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I've done 24,000 miles on the current fuel filter, and am about to fit a new one.

Last time I did this, as I recall, I had quite a fiddle getting the threads of the top cover to engage
properly without jamming/sticking ..., so that I could turn it closed after the new filter was in.
I can't remember if there was something specific I did to succeed.

Could someone remind me.... ( the Haynes just shows a Siemens type )
of the sequence of what I should do.

I seem to remember giving the ring around the edge of the top cover hard dunts with hammer and screwdriver
to undo it. But I can't remember the part that the socket thing on top plays in all this, seem to recall reading that
it won't take much aggravation/force.

Also is there something about the top cover that only needs to turn about 90 degrees for it to come loose, and that's part of
getting it positioned right when putting it back together ?

Help please..

That one is very easy....pull off the pipes by pressing the green peg and the white peg in then get a socket and ratchet on the the big nut and turn the whole thing 90 degrees anti clockwise.
Take off the lid taking care to remember the position of the metal ring and rubber seal.
Clean out the filter housing and fit the new filter...round hole to the top.
Fit the rubber seal and metal ring in the correct order (rub a little diesel around the seal) and fit the housing lid carefully turning the whole lid 90 degrees clockwise.
Click the pipes back in position making sure they click in all the way.
Turn the ignition on and let the fuel flow watching for any leaks...the manual will probably tell you to switch the ignition on and off a few times but I've never had to do that.

Job done.

New rubber seal in place round the top edge of the fuel bowl.
Metal ring put back in its its recess on the top (round hole end) of the new filter.

4 or 5 turns of ignition ( not to fire-up ) to fill up the filter.

Then fired up and ran evenly at first attempt !

Thanks very much jasper.

When I change filters oil/fuel I always fill the filters with oil/fuel and let it soak in for a few minutes then top up again before assembly, don't know if does any good it was just the way I was taught,

I'd just like to add:

VERY IMPORTANT with this type of fuel filter is to completely empty the filter housing after removing the filter. Remove all left-over diesel and thoroughly clean the inside of the housing.

This type of filter housing has a design flaw: the clean side is at the bottom. When removing the filter, the debris will collect at the bottom. Simply plugging in a new filter without cleaning the housing will cause the debris to end up at or in the high-pressure fuel pump, possibly causing havoc.

frog wrote:I'd just like to add:

VERY IMPORTANT with this type of fuel filter is to completely empty the filter housing after removing the filter. Remove all left-over diesel and thoroughly clean the inside of the housing.

This type of filter housing has a design flaw: the clean side is at the bottom. When removing the filter, the debris will collect at the bottom. Simply plugging in a new filter without cleaning the housing will cause the debris to end up at or in the high-pressure fuel pump, possibly causing havoc.

The OP was advised to clean out the filter housing in my post above.

jasper5 wrote:The OP was advised to clean out the filter housing in my post above.

Yes, good point. I just wanted to stress the importance of this step, and the reason to do it.

Fit the filter into the bowl first so that it drops right down into position, otherwise you won't be able to get the top on, put the metal ring on top of the filter which holds it in place then put the top on, should go back easily then.

I have just changed one this evening.

Peter