2003 Cat C-15 - Have to replace fuel filters every 8000 miles?!

maybe fuel lines need replaced.

 

More will chime in but I was thinking about the fuel line also. Have you dump the fuel on a clean bucket to see what is coming out of it ? Maybe the place your buying your fuel, water in fuel....and so on....

 

Fuel transfer pump could probably stand a look. Also, check the fuel in your tanks. If it's really dark you may have oil getting past o-rings in your injectors into the return fuel. If enough oil is getting back there it'll plug the 2micron pretty quick.

 

Have you cut the filters open and rolled out the pleated filter media?
Could be algae in the fuel. Look in the fuel tanks and the sides may have a blackish color to them. I've heard in severe cases the algae will collect on the inlet/top of the filter and have the appearance of chewing tobacco.

If so, you need to get some algaecide, there's probably 50 brands to choose from. Follow the manf. instructions and get plenty of spare filters to bring with you as they'll clog up in a hurry and not at a convenient time. I understand algae is big problem in the marine industry. You have a lot of boats in N.S. lol.

 

Ive seen this same issue on a volvo. The driver went 20,000 miles or so before filter changes. Now all of a sudden he has issues with the fuel and he now swaps fuel filters between oil changes. The T fitting between the tanks may have collected some dirt and debri.

 

^^Welp I tried.^^ Let us know what the resolution is.

 

Probably a fuel line coming apart on the inside like the one fella said earlier.

 

If the truck is being fueled at the same location all the time, might be time to switch. Have a "cheap fuel" stop near me that I can't use due to water and dirt.