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Merc 650 78 looses power after about5 min

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"Mercury 650 65hp about a 1978

"Mercury 650 65hp about a 1978? looses power after running about 5 min. looses about 70% power and here is what has been replaced, new powerhead, new computer box, new coil. Any ideas???"
 
"Tank vent open? When it start

"Tank vent open? When it starts to die, try pumping the primer bulb. If it acts like it wants to go, rebuild the fuel pump."
 
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