Thread: Fuel Filter water-in-fuel drain tube size

The water-in-fuel drain at the bottom of the fuel filter includes a yellow port.
You attach a tube and drain 100ml to check for and remove water.


The workshop manual only states "suitable drain tube".
Does anyone know what size tube or hose fits?
My guess is about a 6-8mm ID just based on holding up an M6 bolt to the yellow port (photo below).


It's reasonably difficult to get at to test different tube sizes so hoping someone actually knows from experience, plus I didn't have any tubing to hand.

I took off the covers on the driveway to have a look at how difficult it was to access and either drain water or replace filter, rather than wait for being in the middle of nowhere to attempt for the first time. It's a very tight space for access particularly when not on a hoist. You could drain it without a tube but it's directly above and close to a crossmember so would be tricky to catch the fuel properly I think.

Thanks,
Scott

Yes,it is very tight to undo initially.With some trepidation,I resorted to pliers to get it to turn.Nothing came out until the filter was rotated off its bayonet type mount and then pulled down off to let some air in.It required two hands, when replacing, to push it up onto its mount and then rotate to lock position.I forgot to prime the new filter, by turning ignition on a couple of times,but motor started first attempt,if somewhat a bit lumpy,second start all ok.If only bleeding off what is in the bottom of the filter[water?]just open the yellow drain tap and turn on the ignition to operate fuel pump.