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Hi guys,
I'm about to treat my 2003 HDi 90 to a service and decided to include the fuel filter element in the job. However I am struggling to correctly identify whether I have a Bosch or Siemens filter housing. I've trawled the web for pictures and nothing seems to tie up as all the Siemens ones I've found have three lines into the top cap, but also none of the Bosch ones look like it. I'm pretty sure it's Siemens as the fuel system and ECU is all Siemens but I'd like it confirmed. I've attached a picture so hopefully one of you will be able to identify. It has the white drain arrangement underneath that also tends to imply Siemens.

Any help much appreciated.

Cheers,
Adam.

The Bosch ones have a big nut on the top.

The one in the picture is a Mahle.

There are only 2 types of fuel filter, the Bosch one has a large hole at each end of the filter, the other has a smaller hole.

Thanks for your reply. What's been confusing me is that Euro car parts refer to the two element types as Bosch and Siemens. Since its not a Bosch filter housing then I have to assume the one they refer to as Siemens is what I want. I just don't want to pull it to bits to find I have the wrong filter.

This is what I have ordered:

http://www.eurocarparts.com/ecp/c/Peuge ... c6d&000140

It appears to have a smaller hole than the one they state is for Bosch:

http://www.eurocarparts.com/ecp/c/Peuge ... 38d&000140

Hopefully I've gone for the right one!

Any tips on fitting? Is it best to completely remove the whole assembly and clean it to get any debris out that gets released when the old element is removed? I assume that I can use the priming squeeze bulb to get fuel into the bowl and do a flush before connecting to the Injector pump?

Sorry for all the questions but I've read some horror stories about what dirt and muck can do if they get into the pump and injectors

Yes, you ordered the correct one

That's quite expensive for one of those filters...I pay £8 for genuine Mahle filters.

Before fitting clean around the top of the filter housing with brake cleaner then squirt WD40 around the edge of the housing top then drain off the diesel from the screw at the bottom.

Be very careful when you try to undo the large plastic screw that is the housing top, it's quite easy to snap off a pipe!!!

Ideally you could take off the complete housing and carefully fit it in a vice (gently) then you have more control over unscrewing the top.

Clean out the inside of the housing using brake cleaner, fit a new seal, clip the new filter inside the top of the filter housing and carefully place it in the housing, squirt WD40 on the screw threads and screw on the housing plastic top.

When you bleed the filter take off the outlet pipe and pump the bulb with your finger gently pressed over the pipe coming out of the filter until you get a nice squirt of diesel, fit the outlet pipe and run the engine.

That's great......thanks very much for getting back to me I had 25% of the price stated so it wasn't too bad.

One more question (sorry )

The quick release couplings onto the inlet/outlet......I assume I push the "buttons" in to release them?

Thanks again for your invaluable input, you are a gent!

Yes, just press in the buttons to release the pipes, push on until they click home when refitting.

I hope all goes well.

Just a word of caution, I've had a couple where the system has been difficult to bleed, if you have trouble bleeding the system it's easier when the car is pointing downhill, but these are rare cases.

Parts catalogues always list Mahle filters as "Siemens" for some mad reason

Thanks for the warning; I will back her up on ramps before I start, just to be on the safe side as I can't see my neighbours helping me push the car up ramps!

steve_earwig wrote:Parts catalogues always list Mahle filters as "Siemens" for some mad reason

Thanks for that; it explains why I was getting confused!

Well I replaced the fuel filter today, no problems at all. Took the entire bowl off and cleaned it thoroughly prior to installing the new filter. Pumped the bulb with the feed to the pump off to fill the bowl, hooked up and she started. I then proceeded to change the engine oil and filter, air filter and pollen filter. Started up again and now I have a "engine anti-pollution system defective" warning Any Ideas as to what might be causing this? It seems a bit of a coincidence that I am getting this fault since doing the fuel filter. I have no idea what to do now

Edit: I went out again after thinking what I had done and the only electrical connection I had disturbed was the sensor on the fuel filter housing (I don't know what this sensor does...please enlighten me someone). I removed the plug and sprayed some brake cleaner in, then blew it out with an air can and reconnected. The fault is now cleared! I am very pleased!!!

I know diesels I've had in the past have a "water in fuel" sensor in the filter housing,might be something like that?

I've been wondering about that too - I've got the same connector,but ServiceBox insists I don't have a water sensor.

Note to self - see if you can break it by unplugging it next time you've got PP2k handy

BTW it may help to know that the APF fault will be generated as soon as it 'sees' a problem. If you fix the problem, you typically have to complete several 'journeys' without the fault for it to go out.

Sorry to appear dumb but can you explain what PP2K is? I assume its a device that plugs in the diagnostic port? Is it something worth buying ( assuming its not mega bucks)? I intend to run this car for a good while longer so the ability to diagnose future faults would be useful.......