What you do next depends on what particular part of the smog test your car failed. The car is tested for HC, CO and NOx levels. Different problems will raise the levels of different pollutants. If your car failed the...
There is probably a filter in the pump and yes the filter could block flow. However, before you consider a plugged filter, inspect the check valves; they will commonly get plugged up or stuck. The pump flow is minimal and...