No, not a Don Ho song this time...

... while under the hood today I noticed I have lots of very tiny bubbles in the clear filter while the car is running.... Is this an indication of a clogged tank screen or something else?! Is it a problem at all?! Car is running fine...

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K