i changed the filter, still had light on. took it out looked down in the bowl, and saw MUD. cleaned it out really well, put it back together light is out. thank you. how often should the bowl be drained? i think it probably would be a good idea to do this to avoid the mud?
The Mud (sediment) you found is inherent to Diesel Fuel(s). Entrained water is too.
But, it could have been a built-up, from 13 years of use.. or maybe you've recently, unknowingly, got a tank of dirty fuel, last time you filled up.
If the station where you last bought diesel.. had recently received a load of fuel, [Their tank] sediments got stirred up, from the re-supply delivery.
FWIW ? Based on gallon-age pumped (sold).. stations are >supposed to have< their "Bottoms Stripped", But.. Sometimes that gets done.... Sometimes it doesn't. Some stations have an in-line, before the nozzle.. filter.. some don't.
Lot's of variables, as to where the mud came from.
How often should it be cleaned/drained ??... Everytime I change the fuel filter (15K Max), I clean the inside of the filter canister, real good.. and drain a good Pint.. at each Oil Change (5K)... but if I'm on the road.. I'll drain some more often.. If I've had to buy fuel from No-name stations, I did'nt feel good about. I also carry an extra filter, at all times. Ya never know.
Joe