Years ago OS had some issues with their pumps....but not now. I have four OS pumpers and really like them. A person can lean the motor out and leave it at that setting. Will run the whole flight at that setting without any problems. Also move the tank back to the C/G without any draw problems. I have read on here the repair cost might be excessive...can't say, as I haven't crossed the bridge yet. Some of mine are three years old and still work good. Just use a filter before the pump.