Ok, here's my deal. I have a 1997 Mariner 30 hp, that I put on my jon boat. I took it down the river last weekend. (yes, downstream). The river was shallow in places, and I hit a sand bar. I thought no biggie, shut it off and floated through it. When I started it back up, absolutely NO water came out of the pisser. So I shut it off, pulled the cover off, and pulled one of the water plugs in the head, then started it. Pumped fine out of it. I still parked it and walked back to my truck. will I overheat it if I run it this way? (can't do much wrenchin' on the river, plus I'm not qualified). Any comments are much appreciated.