How long between changes?
I installed my FASS January of 2013 on CAT C15.
Manual says 30-50,000 miles for Class 8 trucks.
21,302 miles clogged up - would not start (not below freezing - perhaps some bad fuel - not sure) Replaced all 3 filters
18936 - poor fuel mileage - changed all 3
39319 - mpg down - changed all 3
23527 - clogged up - stopped engine - replaced all 3
Is this normal? Looks like I need to change filters at 20,000 miles.
If clogged up, I have started at FASS fuel/water separator, then FASS filter, then main CAT filter. This last time, the seal (o ring?) blew off the CAT filter as I removed it due to the pressure.
Am I working in the wrong direction? Should I start with the CAT filter and work backward?
My filter cost: FASS water separator $ 20.90
FASS fuel filter $23.75
CAT fuel filter $35.42
Cost to change all 3 $80.07
Change at 30000 miles = 4/year = $320.28
Change at 20000 miles = 6/year = $480.42
I still estimate 1/2 mpg boost when FASS is working good, so estimated fuel savings of approximately $4616 annually still makes it work even with 6 changes, if my math is correct.
I buy fuel at TA when I can, which is 90% of time. I treat with Howes when extremely cold, and quarterly during warm months just to be safe.
Anything else I should be looking at?
Is this a good question?