SOURCE: My craftsman air compressor model 919 16737 1.1 hp
Probably the check valve has failed. It apparently is where the pipe goes into the tank from the compressor.
SOURCE: Can not build working pressure pressure......
The most likely problem is a burned out "run capacitor" on the motor. If you continue to try to run your compressor in this condition it will burn out the "starting capacitor" and/or motor as well.
It's also possible that you have a bad start up pressure relief valve, this valve will be between the compressor and the tank. If this valve is working properly you should hear a hiss of air as the compressor motor shuts off.
A reasonable motor repair shop should be able to replace the run capacitor for $20-$50 plus inflation, depending on your area.
If you need to test the start up pressure relief valve, you need to take it loose at the compressor or tank. Just loosening the line may not work depending on the style used. Note: sometimes just taking this loose to test it causes you to have to replace the valve.
SOURCE: I have a model# 919166442
There is a check valve that has gone bad,this allows air into the tank,and does not allow the air to go back toward the compressors head.This can also cause the compressor to lock up.
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