Dad and I refurbished a 9570 Northwest crane about 20 years ago. It had been sitting for about 10 years, with about 100 gallons of fuel in a 200 gallon tank. That was the first time we ran into the 'microbe' contamination.
The old MP 21 Murphy started and ran like a dream, until the filters clogged. They drained the tank, opened the hand holes, and steam cleaned it, before filling with new fuel.
A few days later they went to move it across a road that divided the sand pit. Enough new goop had grown in that time that it collapsed about a 3 foot long sock filter to about half it's length, blew the gaskets on the filter housings, and shut them down with the road blocked.
That's when we learned all about this kind of problem, and it was a challenge finding anybody that even knew what a biocide was. When people started having problems after Katrina, it's common now to see the auto parts stores keeping it on the shelf. That's a good thing given the new biojunk they are forcing on everybody now.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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