Changed the impeller on my 25 outlaw 502 mag and it was missing a piece...where could it be in the system? Look where first?

Did you check the oil cooler?

I think it goes from the raw water pump to the power steering cooler on the back of the motor then to the fuel cooler bottom of the motor on port side then to the oil cooler front of the motor port side. after that it enters the cooling system. I would say start at the power steering cooler, then go to the oil cooler. there are no obstructions in the fuel cooler so skip that. you might have to do a backflush with a garden hose from the top of the oil cooler back. i'm sure others will chime in but this will get you started.
Good luck,
Derek.

BAJA boy is correct on the order of the coolers.

pull lose from thermostat housing (and pump end) and back flush, with water. if you dont get it, try putting you mouth on it, and sucking and blowing back and forth, that dislodges it sometimes, and then some water back flushing will send it out at the pump end.

Good deal...thanks yall...I gotta take it apart now and find that piece.

As mittens said!

I had one shredded, put a net on the outlet hose coming out pump, thn take hose off t state housing and backflush with water hose wide open!!!

Net is so you can see what you caught!! It will flush from cool fuel thru power steering back around to pump hose.

If you get to the suck blow part can you video it so I can earn $100,000 on America's funniest home videos?

LMAO!!!

haha its is funny, but you got to do what you got to do when your up **** creak, with a none running boat!

too funny .