Oh No! "Water detected in fuel" 2013 TDCi

[AlCan]

Well...

Getting ready for Christmas, just about to take the Star Wagon for a test run after swapping a couple of tyres around. A Bing, and a message, briefly on the orange Plasma Display.

I see one other related thread, but that was for the previous MC engine variant which had a belt-driven Power Steering pump and the Fuel Filter down the back beside the tank. I think I could handle that, but this one is different.

It has the PSA, 3-logo fuel filter housing installed on the side of the engine about where the Power Steering pump used to be. Alan Howatt does a video on replacing this filter but it makes me nervous, knowing how difficult it can be bleeding this single pump system if it decides not to play ball.

Anyway, I've had a close look at the filter housing and see what appear to be a couple of football-bladder-style bleed points.

One is on top of the housing just in front of the fuel return line (air bleed no doubt), just above the LHS of the FoMoCo logo, the other on the bottom right (passenger) side, angled to face forward and up, for easy access (for water extraction???). That one is in a plastic moulding, attached to the side of the bowl by a bolt.

These can be seen in the two linked photos - a round plastic cap with a cross in the centre. There's a hole about 10 or 15mm deep, and some kind of (soft?) plug at the bottom.

https://photos.google.com/share/AF1Q...B4LWM5elp2cWRR

https://photos.google.com/share/AF1Q...B4LWM5elp2cWRR

Does anyone know what kind of tool fits the lower bleed point, and does it seal again after use or does it need to be replaced?