I just noticed in my Haynes manual that I'm supposed to replace my (petrol) Fiesta fuel filter every 35,000 miles. But I have to admit that the one that's in (under) it has done over 100,000. Has anyone ever dismantled one to find out how dirty they get these days? The pressure seems to build up quickly enough (a second or two) when you turn the ignition on. The filters in my old (70's) motorbike are always clean, but maybe they don't filter so finely?
The missus has a diesel Volvo. Are they fussier about fuel filtering? I think I read somewhere that they are, but (of course) the internet is a mine of information, much of which may not be true :-)