George, while your at it drain some of the fuel from the fuel line to the motor, maybe a 1/2 gallon or so into a oil pan or some thing like it about 6-8 inches deep and look at it and watch it in direct sunlight. I have seen the separation before and delamination of the fuel lines (black film)in the fuel. I experienced the same identical symtems on my 250 merc a couple years back. It clogged eveything up and I had to rework everything including cleaning the tank.
goodluck bill
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