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There ought be good pressure from the returns, does the filter need to be cleaned?
There are 'bushings' that will adapt almost any size PVC pipe to another size (sometimes you need to do it in steps - i.e. from 1" to 1 1/4" to 1 1/2"). Any chance of getting us pictures of what you're dealing with? (you can send them to Ben (the admin) to get them approved and posted)
The more you can tell us about the valves, the return inlets and the filter pressure (what it is now v.s. start-up psi), the better we can help you get to a properly working pool.
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