1988 302 not getting water

[nbarnabe]

Hello, I am new to this forum. My father and i are trying to figure out what is wrong with our boat. We recently changed the impeller in the sea water pump and after we put it back together, water was pouring out of the seal after start up, but the engine was being supplied with plenty of water, lots of water coming out the exhaust like normal. We took the pump back out and replaced the seal as well. The pump no longer leaks, but now there is no water coming from the left exhaust and very little coming out of the right. (we were running it on the trailer with a hose supplying the water). The right side exhaust manifold was staying reasonably cool, but the left heated up quite a bit.We tried bleeding the air out of the pump and that did nothing. We allowed it to reach running temp, thinking it might have something to do with the thermostat, but no luck. We also checked the manifold for blockage, but it seemed totally clear. We are out of ideas at this point and any help is greatly appreciated. Also, this is a sherwood g21 series pump. Thanks.