Howdy, I've just finished a rebuild of a little Mercury 3.3 2 stroke, about 2000 model. Everything works OK - except the Tell Tail. It runs - Gears (Forward & Neutral) work - all seems good, except the Tell Tail. As part of the rebuild I put in a new Impeller/Water Pump kit. The Mercury 3.3hp is identical to the Mariner 3.3hp and the Tohatsu 3.5hp. Trouble Shooting so far. 1: Pulled The Gear Box off - dipped it in water, and turned the Drive Shaft with a drill - Water came out of the top of the Pump Housing. 2: Pulled the whole Power Head off, and turned the Drive Shaft with a drill - water came out of the top of the water pump tube, and started filling the water galleries. 3: Pumped water into the Tell Tail pipe (Power Head still off), and watched it come back out of the hole at the bottom of the block's water galleries. 4: Reassembled motor again - ran it in test tank - nothing - no water comes out of tell tail. Any suggestions as to why? I was wondering if I have to prime the water pump, but when I test it with a drill, it self primes without a worry. Is it possible the agitation in the Test Tank water isn't allowing the engine to suck up water? I guess it's [possible, but I've never had that issue with any of the many Seagulls I've tested in that same tank. Other observations... 1: Smoke/Exhaust comes out of Tell Tail Pipe at times 2: I have tried the Impeller with the vanes oriented both directions 3: Test Tank water is well above the Cavitation Plate - at least 10 inches above it. Can anyone help? Thanks.