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Mercury Optimax Warning Horn

jwerni

New member
I recently replaced the thermostats on my optimax 150hp 2000 and when i was moving the fuel rail it made a air pressure release noise when i removed the left fuel rail for that thermostat it didn't make the same noise. Might of i knocked something off of the fuel rail? is it normal for it to do that? I can't figure it out.
 
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