Someone calls on a pool motor, one way that works well is charge them a service call anywhere from $90 to $159 depending on your cost of operating, then when you arrive do your troubleshoot, if the pump itself has a problem, you can offer some options, new replacement pump is uaually best option if the existing pump has some years on it, or take it to a repair shop where it may cost more for the repair then a new pump, either way, you will most likely be making a return trip, and are intitled to charge for your travel and repair time, so an easy way would be to give them a flat rate for your return visit, washer repair man charged us $90 for 10 minute troubleshoot, then made up repair estimate, $270, so had we decided to have it repaired we would have paid $270 on his next call, whatever it costs to do the repair, you need to get paid for your work, unless your running a charity operation.