The published test methods for diesel fuel filters are reviewed in the light of the conditions in service.
The measurement of diesel fuel filter performance in service is a long and costly process. The fact that most filters in service are choked by soft organic trace constituents of the fuel causes the greatest difficulty in laboratory testing. A test method which reproduces the organic choking effect has been described and is satisfactory for comparative tests; it has not been adopted as a standard owing mainly to difficulties associated with variability of the choking life measurement. A possible solution to this problem is suggested.