BX project – fuel filter

I’ve put off changing the fuel filter on the BX for a few reasons, such as not really enjoying getting diesel all over my hands and the fact that I accidentally ordered the wrong fuel filters to start with…

It needed doing. The engine has felt a little underwhelming, a touch flat. I know 65bhp from a thumping, normally aspirated diesel is never going to exactly push the tyres to their limits, but it felt like it was suffering from fuel starvation. I could tell it wanted to give just a bit more…

Gunky mess

Slimey mess in the BX's fuel filter housing. Yuck!

So, it’s a simple case of disconnecting the hoses to the fuel filter housing (19mm headed bolts), removing the housing itself (two 13mm headed bolts and nuts) and then taking it apart in a suitable container (releasing the 11mm bolt on the bottom of the housing). This last bolt was VERY tight, but I finally defeated it and could pull the housing apart. The filter plopped out, showing obvious signs of gunky debris, with a good layer of slime at the bottom of the housing too. No doubt this built up during the 3 years of inactivity while this car sat in a garage.

With the housing cleared out and a new filter fitted, it was then a case of bleeding the system and taking it for a test drive. There’s a 12mm bleed bolt on the housing so I released this and pumped the prime button until fuel came out. It took a few spluttering attempts before the engine ran, but it did seem a bit more eager.

However, that might have all been in my mind as out on the road, it still felt flat. I decided at this point to give it a slosh of unleaded fuel. These engines have been known to respond well to a touch of petrol mixing with the diesel, so I slopped in 5 litres with a fresh dose of diesel. On the return journey, it did feel a little less hesitant, so hopefully this combination of factors will lead to improved performance. So far, I reckon it’s not even doing 40mpg as I’m having to drive absolutely everywhere with my foot right to the floor! I know I’m a quick driver, but I expect even a normally aspirated BX diesel to feel a little more perky.

I shall see how it performs over the coming weeks, before it goes in for some drastic metalwork surgery later in the month. Hopefully this’ll lead to me being able to use the tailgate again…

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