Ok guys - I'm sorry for not posting back. I was able to figure the plumbing out. It looks like the pool heater had been disconnected and that's what the second pump was going to.

I was able to put back together all the plumbing - and when I went to fire up my pump it just buzzes. I've read what I could online - and I've tapped it, beat it, and replaced the little deal on the top of the motor that goes out sometimes. None of it works - twice the pump kicked on - but now it just sounds hung up (Even though I can manually turn the cylinder).

So. All that to say, I'm looking for a new pump. The motor on the old one was a Franklin Electric 1HP motor. I'm looking for something economical because...I'm about to spend all my money on buying another house (long story) and I just need something that'll last the summer for now.

Can I get away with using an above ground pump for my in ground pool? I was looking at this - http://www.amazon.com/Hayward-SP1580...9467394&sr=1-3 - from amazon. It looks very similar to what was there before. But I'm wondering if there will be more stress from an in-ground pool due to the increased distance to the outlets, etc.

I'm sorry - I know what I'm asking is going to sound very stupid to somebody who knows what they're talking about...

========================================

I think I answered my own question "Long runs, multiple fittings, and smaller piping create pressure within the lines which is transferred to the pump. This is just one cause of pump overheating and failure. Every pool plumbing system has a calculable "maximum plumbing flow rate" which must be taken into consideration when choosing a pump."

What numbers do I need to look for on my old pump to determine the size needed for the new one?