Why so many filters?

Posted: February 1, 2013  |  Tag: Engines

By: Grid Michal

I thought I was ahead of the game when I got rid of my yacht with big blocks that burned ethanol gasoline and got a smaller cruiser with Yanmars. The diesel fuel system has more filters than the White House press-information line. How come?
If I could get grass to grow in our newly seeded yard the way algae grows in diesel fuel, I’d be tickled. Maybe I’ll pour diesel in the yard and see if it helps. To answer your question, part of the reason for multiple filters is that diesel isn’t as refined as gasoline. Another is that algae — yes, real wavy grass — grows well in the environment inside your fuel tanks. It takes very little gunk to plug today’s highly efficient injector systems, so in most cases you’ll see at least two tiny-micron Racor filters between the tank(s) and the engine(s), giving you a little extra protection — and a warning, before the engines shut down because you didn’t “mow your lawn.”

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