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Diesel Fuel Filter - not that hard a job

Bob.W · 2 · 1561

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Offline Bob.W

  • 3rd Gear
  • *
    • Posts: 112

    • au Australia
      Coffs Harbour
Hi All,

I'd been putting off changing the diesel fuel filter in my PD for a few months, last had it done a couple of years back and paid a mechanic to do - ($150 which included the filter but this was a 'mates rate' he said it was a crappy job to do).

Thankfully there's lot of YT tuts on this - and after watching a bunch of them I gave it a crack.

I didn't want to remove any more of the engine than required - and got away with taking out only the battery and the ECM.

TAKE PHOTOS or video first so you know what goes where. A good light is handy as is right at the back of the engine bay.

Oddly the trickiest bit by far was figuring out how to remove one of the sensor clips that goes directly into the filter housing.  No real special tools needed, basic socket set, extension bar (to get the battery's clamp off). A bench vice is handy to hold the old filter (& new one) as you remove the top section. Also a bit of fresh diesel to fill the new filter back up.

Undo all the clips and sensors, do the same with undoing the fuel lines  - be gentle with these & try not to get grit or dust in them (I gave a quick clean up around the general area BEFORE starting the job).

The bracket that the fuel filter is in has 10mm screws holding it onto the car up high and down low, take your time to remove these - careful not to drop into the engine - can be tight to get at.

I didn't have to remove the air manifold, air filter etc - but you can if it assists you.

Remove the fuel filter bracket, have a container ready as it will be full of diesel.  Empty this out, wipe down the assembly and remove the old filter. Unscrew the water sensor at the bottom - set aside including the rubber seal as most kits do NOT come with another one of these.

Unscrew the filter from the housing. Use a vice or multigrips to remove the top section of the housing from the filter. Pour out old diesel, dispose of properly (not down the drain!).

Take new filter, apply some clean oil to it's top seal. Screw water sensor into the base of it, doesn't need to be overly tight. Screw the new filter into the top section of the assembly AFTER you have filled it with clean diesel fuel. Hand tight only.

Screw the entire new filter back into the bracket housing.  Do not tip it too much or the fuel will come out.  Put back into car, finger tighten the screws that hold it on. Reattach the fuel hoses, making sure you wipe down the connections on the filter bracket with a clean rag BEFOREHAND.

Reclip the sensors back on. Tighten the screws and place the ECM back in and tighten, and then the battery, reattach the battery.

Then you need to purge the air from the fuel lines, this is done by cycling the ignition a half dozen or so times - by pressing the ignition button but NOT actually starting the car. Then start the car & check for any leaks.

All the sensors only go on one way & are unique to each other - so aside from getting the fuel hoses clicked back on very little to 'mess up'.

Is not that hard a job, don't be scared off it. Took me about an hour total, easily doable in 30mins.
  • 2017 PD 5 door hatch, diesel 1.6lt, auto


Offline BrendanP

  • Technical Advisor
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    • Posts: 556

    • gb United Kingdom
      East Midlands
To unscrew the filter cartridge - because it was so tight - I folded a piece of sandpaper in two and wrapped it around the filter so that the jaws on my workbench had a better grip on the filter body, rather than the filter spinning in the jaws. I also used a big syringe to fill the new cartridge with fuel, injecting into one of the fuel pipes until it oozed out of the other. When starting the car I just needed to crank it as normal, it just took a few more seconds to fire up. It's certainly an easier job than I expected it to be, though one of the electrical plugs was stiff to get off, but once you realise exactly where to press on the plug to release the catch, it makes sense.

I bought a Mahle filter, as this was original fitment on my car. It had the Mahle part number printed on it as well as the Hyundai/Kia part number.
  • i30 CRD


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