I installed a CAV filter/separator to my hilux in 1994, after a bad batch of fuel blocked the fuel pick up in the tank at 20,000km (i removed the in tank sock as it would not pass the black gunk)
the vehicle has now done over 300,000km, I changed the OEM filter at 200,000km as it was starting to rust on the outside, (I live on a dairy farm and the vehicle is always mucky from the cows droppings)
have always cleaned out the CAV every 5,000km since fitting it and always find a small amount of black sludge and some grit in the bowl, the black sludge and grit come from the local servo, if I see the tanker in the bay I try to wait a day before filling up to avoid as much as possible fuel from a stirred up tank
regards
Joe
PS have also fitted the CAV filter separator to my GUDX , Pajero and tractor for same reasons
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