CAV's what brand of filter is the best ?

[Cuppa]

In your case Cuppa, or any case that see's someone being off road a lot and buying fuel from god knows where, a pre filter would certainly help. No doubt. But, for the majority of shopping trolleys, its not really a necessity, in my opinion.

If you are going to put a secondary filter on though. The CAV's are good. They are 12 micron at 99% efficiency, so it filters fairly fine particles but may not be enough for the CRD motors. The filters are dirt cheap too, about $6. Get a spare bowl too, and also zip tie some thick rubber around the bowl to protect it.

Yep not recommended for common rail motors, & unnecessary for cars that get their fuel in populated areas, but filtration is a bit better than 12 microns I think, at least according to this according to this.

screenshot_106.jpg

Mind you I have read claims they are as low as 2 microns elsewhere on the 'net (have my doubts about that though - I would think that may well affect fuel flow). My guess is that along with the variety of brands of filter that fit these CAV type housings there is probably a variation in micron ratings. Bottom line for me is that it works as per my previous photo & with no fuel flow issues using the stock GU fuel pump & no additional lift pump. That photo was after around 10,000kms. As a result I decided to change the CAV every 10,000 & the standard filter at 20,000, I'm yet to do that though. If I have the means to cut open the standard filter when I next change it I will, & if it looks clean enough may up the next change interval of the standard to 30,000kms.