[C320-list] How to tell when you need to change your Primary Fuel Filter

[K L]

Thanks to the recent discussion here about changing the primary fuel filter 
I finally got around to that long postponed job. In the process I noticed 
something that might be useful. For the past six months or so whenever I 
would start the engine I would notice that the idle speed would drop 
slightly after about a minute. I didn't think much about this till I changed 
my primary fuel filter. After I changed the filter I notice that I no longer 
experience a drop in idle speed. From now on if I notice a change in idle 
speed I will immediately change the primary fuel filter.

Ken Danko
#802, Grace
San Francisco