BXProject

[mat_the_cat]

Well, I had a week of the BX starting fine, but over the last 2 days it's taken longer and longer cranking over, now getting on for 30 seconds plus. I suspected an air leak as it improved pumping the bulb. This morning I noticed a small dribble from the bottom of the fuel filter housing, where (I think) the water in fuel sensor lives on other engines.
I'm at work now, so can't easily check it, but am I right in assuming it's just a screw in plug with an O ring underneath to seal it. I did screw in in slightly but the leak seemed to get worse...

[Bx Bandit]

tis so MAtt although it may be a copper washer rather than an O ring. Can't remember.

[docchevron132]

Copper washer it is, or at least is on every one I've ever seen...
I do have several spare housings if you need one, I've seen them crack around there before..

[mat_the_cat]

I'm about to have a look, must admit I'd be surprised if it was copper as that would be harder than the plastic housing...will see!

I wonder if we're talking about the same thing?
I mean the white thing above the tissue in this photo


It turns but does not seem to tighten, and looks as if it is held in place by a cupped star washer. I'm going to wait till I get home to investigate but it definitely dribbles once the rubber bulb is pumped.

[Bx Bandit]

Citroen show this:



and lists it as integral to the whole housing (integral as far as replacement goes anyway). Shows 2 seals but doesn't list them separately so don't know what size. I guess those ones are 'O' rings. Don't know what it does though

[jayw]

Well, looking at my one on the Zant i'd say it looks like a drain for the filter housing?

Mine does apear to tighten/loosen, but maybe yours is spring-loaded push to drain? Or, just the thread is knackered?

[Philhod]

Mine has one of them. Never touched it though. The drain is underneath with a plastic tube attached.

[jonathan_dyane]

That's the thermostatic valve which controls whether the diesel goes through the catacomb heater or takes the short cut. If you remove the filter housing from the car, you will be able to carefully remove the spring clip, withdraw the white thing and replace it's O ring.

[jonathan_dyane]

The bit which sometimes has a water-in-diesel sensor is round the corner, and the drainer on the front

[mat_the_cat]

Thanks guys. I didn't get as far as opening up the filter, got sidetracked with Landy electric window troubles and then noticed that the less-than-a-year-old leak off pipes had all split at the ends so replaced all those. Problem better but need to sort this little valve, probably tomorrow.

[docchevron132]

ahh that! I thought you meant something quite different!

[Bx Bandit]

That's the thermostatic valve which controls whether the diesel goes through the catacomb heater or takes the short cut. If you remove the filter housing from the car, you will be able to carefully remove the spring clip, withdraw the white thing and replace it's O ring.

So that's what it is!!!!!!!!! Nice one JD

[Philhod]

Ah! Clever, JD, I always thought the diesel got warmed up anyway when they moved the filtre onto the thermostat hsg.

[jonathan_dyane]

It probably gets slightly warmed, but the thermostat only allows the diesel through the labyrinth in cold temperatures. On my old Xantia which I ran on 100% WVO I modified the arrangement, throwing away the thermostat and inserting a slightly filed down penny which had the affect of forcing the fuel through the labyrinth at all times.

[Bx Bandit]

Ah! Clever, JD, I always thought the diesel got warmed up anyway when they moved the filtre onto the thermostat hsg.

Me too!

[Vanny]

and me

[Philhod]

You'll have to let chidders and co know. It will make a change reporting thermostatic valve probs instead of doseur.

[mat_the_cat]

Took it apart tonight, only to find the plastic was all brittle and disintegrated when I pushed it back in with a new O ring. Fortunately managed to find a spare so tomorrow morning will tell whether I've been successful. I did notice a lot of water in the bottom, especially considering it's only been about 3k miles since I changed the filter. So I've either got a water leak into the tank or I've picked up some dodgy fuel.

[docchevron132]

Probably the bolt with the stupid O ring...

[Philhod]

Seeing as it's atop the thermostat, I hope you don't have a leak there??????????????