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I took my boat to the lake the other day and had an overheating problem. I changed the impeller and thermostat and figured all would be good. Not so much, I'm not getting any water to the impeller. I back flushed the line and water was flowing backwards but I'm still not getting water to the impeller with the muffs on. Is there a trick to priming this thing? I put the hose up to input of the impeller and it is pumping water so where else do I look? Its a 99 220 with a 5.7GSi DP. Any help would be greatly appreciated. Thanks.

Nick

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99 220 Horizon
5.7 GSi DP

Check the pickup hose on the port side of the out drive. You can see it by an access hole. Mine broke there. Caused same issue as you.

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread

You mentioned recently replacing the impeller.. did you perhaps mistakenly swap the hoses for the inlet and outlet of the raw water sea pump? its a very easy mistake to make, try swapping the hoses @ the pump.

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'99 Four Winns 240 Horizon 7.4Gi Volvo DP-S

It could be that the O-ring between the outdrive and the transom assembly is shot and sucking air. If you are hooking your hose to the hose connection on the motor and everything is fine, but it overheats with the muffs, I would look at the o-ring. Try dropping it in the water and running it at the ramp. That o-ring should be under water at that time, hence no sucking of air. Put it up on plane and you'll be sucking air and overheating. Worth a shot.