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My air compressor continues to run even after the tank is full

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It sounds like the air pressure regulator is either out of adjustment or needs replacing.

Posted on Jul 07, 2010

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My 5 year old compressor runs continuously and only reaches 40 psi

The pressure hose is not leaking on the connections between tank and cilinder the pressure unloader underside on the pressure switch with little blue or black little hose is closed (not blowing air out ) if the compressor is running? and is the check valve on the tank not dirty inside ?? if the pressure unloader or connections are definitely not leaking.
A little piece shard of the membrane plate(s) thats insite the head of the pressure cilinder is broken and is inserted in the black rubber of the check valve .
More possibilitys the pressure switch itself. the insite diaphragm membran has a problem replace always the whole pressure switch if its defekt.


Oct 14, 2015 | Psi Air Tools & Compressors

1 Answer

Air compressor tank will not fill?

STOP. What pressure does the gauge show? If it's higher than it should be, drain the tank and replace the pressure switch. If it's not unusually high, then replace the pressure relief valve.

DO NOT let that compressor run at too high air pressure! A burst air compressor is a TERRIFIC bomb, and can kill you before you know what happened!

Aug 04, 2014 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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My compressor quit working when i flip the on switch it does nothing any ideas what is wrong???

If the tank is full (pressurized): Nothing will happen when the switch is turned on. Bleed some air from the tank to see if the motor turns on when the pressure drops.

If the tank is empty or low on pressure: First check the circuit breaker to the outlet the compressor is plugged into. Next, somewhere on the compressor, usually on the motor, there is a circuit breaker. They are usually a small round white or black button that if tripped will stick out about 1/4 inch or more. Push that back in and check to see if your motor runs. The usual reason for these circuit breakers to pop is because the compressor is being run on an extension cord. Rule of thumb for compressors: run longer air lines, NEVER use extension cords. If it is absolutely necessary to run an extension cord it should be 10-guage and no longer than 25 feet.

Jan 31, 2011 | Craftsman 15 gal Air Compressor 3 hp UMC...

1 Answer

The compressor runs,but does not build up pressure even when you turn the pressure knob to lower or raise the pressure. It just continues to run

Hi, my name is John. Welcome to FixYa. Check that you don't have a split line from the pump to the tank, also air hoses,exc. any kind of air leak, check and clean breather, if that does not help, then you are not getting any intake. Thanks for choosing FixYa. ... John

Nov 22, 2010 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

Back end of my 2001 Ford Expedition FWD, Eddie Bauer, was dragging. Had diagnostic test run and found out it needed a new air ride compressor. Had compressor installed, but compressor continues to run...

The compressor should only run until the rear suspension reaches the desired height. If it continues to run after the suspension has raised to ride height then you may have a leaking air bag/solenoid or line. If you dont have any leaks it is possible the EVO(air suspension module} or relay is at fault.

Nov 14, 2010 | 2001 Ford Expedition

1 Answer

I have a craftsman professional twin cylinder 240 volt air compressor model #919.184191. It has a tube running from the tank to the switch and it is blowing air out where the tube connects to the switch....

Leaking in-tank check valve will cause air to continually leak out of unloader valve at pressure switch. Remove brass/steel fitting at tank and check seat for debris or replace as needed. You can use generic valve just watch fitting sizes. Available at Good luck

Sep 29, 2010 | Craftsman Air Tools & Compressors

1 Answer

Compressor runs loaded continuously even in low/no demand periods

Each compressor should be checked several times per year as to length of time it takes to fill an empty tank to set pressure. This will provide chart of performance / efficiency. I believe that compressor #2 is not running to full capacity. If compressor # 2 is suffering from leaking valves or headgasket the head and air discharge temp will higher than compressor #1. Good luck!

Oct 14, 2009 | Ingersoll Rand Air Tools & Compressors

1 Answer

Porter cable pancake compressor seems to run weirdly

hello, it sounds like your pressur switch is going bad or your have a air leak on the tank or from the tank some where. does your pressure gage read that the tank is fully charged ?

Mar 28, 2009 | Porter Cable Cable Brad Nailer and...

1 Answer

Unit runs but no water in storage tank

Make sure conditions are not too cold or too dry already.
Is the compressor running?
Set the unit to the continuous run setting or the dryest setting
compressor should start.
If compressor runs but the evaporator doesn't get cold the freon has
leaked out.
If compressor doesn't run no matter what you do the board may be bad.
Also the fan must blow air.

Sep 30, 2008 | LG DH30 GoldStar Dehumidifier

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