I am replacing gas lines on my 97 GTX and I have removed the fuel selector switch to clean it out with carb cleaner. I sprayed the cleaner into the holes but only notice a small amount of cleaner going out of the "out" pipe. I did have the selector in the correct position for "on" and "reserve". How do I know when to replace the switch or if it's actually working correctly with the correct volume of fuel coming out?