Diesel filter should be tested as follows according to ISO4020 standard (road vehicles-fuel filter test method for automobile diesel engine).

(1) The cleanness test of the new filter determines whether the inner side of the filter element has been removed from the dust and impurities remaining in the production, storage and transportation.

(2) The bubble method test is used to confirm whether the filter element has pores larger than the filtration accuracy.

(3) Filtration efficiency and life test Filtration efficiency refers to the determination of the percentage of specific particles that are filtered out, and the filter life is expressed as the time when the plugging test pressure difference is greater than 0.07MPa.

(4) The water separation validity test determines the percentage of water in the oil-water mixture separated by the oil filter.

(5) The filter element damage test determines the anti-rupture pressure of the filter element.

(6) The oil filter assembly damage test determines the ability of the assembly to withstand internal pressure.

(7) The pulsating pressure fatigue test measures the mechanical strength of the oil filter assembly under pulsating pressure (simulating engine start or stop).

(8) The anti-vibration fatigue test determines the mechanical strength of the oil filter against vibration under normal use conditions.

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