replace all your fuel lines. Does it have the grey "quicksilver" fuel line? Cut a section off, slice it length wise, and open it up. You will probably see the inner lining of the fuel line turning brown and coming apart. Replace all the lines from the tank till you get above deck with A1 type line, its a little more, but it holds up better, replace all the above deck line with good quality B1( I use trident hose), replace the primer bulb with a good one made by Mercury, Bomb, or Yamaha. Make sure your water sep filter housing is flushed as well. Check the filters/strainers on the engine as well.
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