There is a 1/8' NPT plug in the top of the block, aft of the flywheel. Unscrew this plug and start it just long enough to see if water comes out.
The 2-3 hoes is a balancing line (has fuel and oil in it).[/QUOTE]
Exactly what I thought, bgc. There are two balancing lines.
Joe, what is your serial number? Also, you now have two threads going on about peeing. This one which has diverted from no spark to no pee and a no peeing thread here:
http://forums.iboats.com/mercury-mariner-outboards/1966-merc-500-not-peeing-611586.html#post4262325. This is getting confusing - pick one or the other. I've posted in both and I'm getting lost.