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My five gallon, one HP model 921.166360 won't build any more than 20 psi. Can't figure out why. thank you.

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Posted on Jan 02, 2017

manhandy
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SOURCE: 1 HP 3 Gallon Air Compressor does not build up pressure.

it sounds like the regulator is out of whack turning down increases air pressure. make sure there is no leaks

Posted on Jun 28, 2009

  • 24 Answers

SOURCE: My compressor will not go

The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

Posted on Mar 02, 2011

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1 Answer

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Hi, There are different posibilities. I would need more information. Was it always like that? Does the guage on the main tank and the guage on the regulator both not show more than 20psi? When the auto shut-off is triggered do you feel there is more than 20 psi in the tank?

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1 HP 3 Gallon Air Compressor does not build up pressure.


it sounds like the regulator is out of whack turning down increases air pressure. make sure there is no leaks

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