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A bit of a summary for new comers.
When I researched filters several years ago Mitsubishi provided the info that their NT CRD fuel filter was 10 micron.
As stated many times previously - quoting a micron size without an efficiency is meaningless.
My best guess is that the factory CRD fuel filter is around 10 microns @ 95% efficiency using comparative data from Donaldson replacement filter which is meant to be equivalent or better than factory filter.
Info from Ryco indicated the Z699 is rated- 4 micron @ 94% efficiency. This is my preference if I was only using one filter.
Fuel flow and pressure drop are important factors that also need to taken into account when fitting an extra filter. Fuel filters filter "better" with use. Fuel flow decreases as the filters are used. The trick is to always change them before fuel flow is compromised. The Donaldson ..615 is rated at 114L/H. Donaldson also use this same material in a filter with more than double this flow rate.
Diesel is filtered many times before it is actually used. This polishes the fuel before use ie it is filtered multiple times before use.
Refilling (when possible) when tank is half full enabling highly polished fuel to mix with new fuel make sense to me.
Parker Racor have recommended filtering fuel for CRD to at least 3 micron @95% efficiency. To date I haven't found any vehicle manufacturers that have published a recommendation.
Fitting a secondary filter that meets above specifications should help injector and pump longevity.
I currently change my factory filter (a Donaldson - sometimes Mitsubishi) at 30K intervals and secondary Donaldson ....615 at 10k intervals.
I let my ..615 run up to 16k's when on trips. I always carry spare fuel filters. Ditto air.
I have no connection with Donaldson.
Hill
When I researched filters several years ago Mitsubishi provided the info that their NT CRD fuel filter was 10 micron.
As stated many times previously - quoting a micron size without an efficiency is meaningless.
My best guess is that the factory CRD fuel filter is around 10 microns @ 95% efficiency using comparative data from Donaldson replacement filter which is meant to be equivalent or better than factory filter.
Info from Ryco indicated the Z699 is rated- 4 micron @ 94% efficiency. This is my preference if I was only using one filter.
Fuel flow and pressure drop are important factors that also need to taken into account when fitting an extra filter. Fuel filters filter "better" with use. Fuel flow decreases as the filters are used. The trick is to always change them before fuel flow is compromised. The Donaldson ..615 is rated at 114L/H. Donaldson also use this same material in a filter with more than double this flow rate.
Diesel is filtered many times before it is actually used. This polishes the fuel before use ie it is filtered multiple times before use.
Refilling (when possible) when tank is half full enabling highly polished fuel to mix with new fuel make sense to me.
Parker Racor have recommended filtering fuel for CRD to at least 3 micron @95% efficiency. To date I haven't found any vehicle manufacturers that have published a recommendation.
Fitting a secondary filter that meets above specifications should help injector and pump longevity.
I currently change my factory filter (a Donaldson - sometimes Mitsubishi) at 30K intervals and secondary Donaldson ....615 at 10k intervals.
I let my ..615 run up to 16k's when on trips. I always carry spare fuel filters. Ditto air.
I have no connection with Donaldson.
Hill
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