With diesel fuel, there is the possibility of algea in the tank. Interesting how a motor fuel can support a life form. You do not have to worry about this with a gas/petrol/benzine engine, as algea would not survive. Algeacide in the diesel fuel will help to kill off this filter clogging life form, but may not cure it. In extreme cases, the tank may need to be dropped and flushed thouroughly to rid it of this slimey pest.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.