Fuel dripping from carbs...

[dfrants]

Picked up a very used rebuilt Merc 150 xr2, at idle it drips fuel from the carbs, especially the middle one. When I squeeze the primer bulb the carbs fill and don't overflow, It happens while it's running. Compression is 112-115 on all six.

 

[dingbat]

Using the primer bulb builds more pressure than the fuel pump.

Either adjust or replace the needle and float in the offending carb

 

[Chris1956]

Some of the early V6 motors do not have replaceable floats. Be careful with your floats until you see if they are replaceable.