Question about Air Tools & Compressors

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Air compressor starts and runs until the condensate valve on the air tank is closed to build pressure, then the engine stutters and stalls. The copper line from the compressor to the tank gets too hot to touch, as does the right side tank on the compressor (this is a twin tank, wheel barrow style compressor with a 5.5 GX160 Honda engine). I have increased the idle speed but that didn't stop it from stalling. There is a black air line from the infeed for the air from the compressor that goes to the engine and serves as a governor/idler to the engine when the tank pressure reaches the set pressure.

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  • millersofarn Jul 19, 2009

    Just did exactly what you said and it is now running THANK YOU

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I think your problem is with the engine, most likely a piece of dirt in the main jet of the carburetor, remove and clean the carb with compressed air.

Posted on Jul 19, 2009

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I have a DeWalt Emglo portable single gallon tank 1.8 hp compressor. When I put it away in September all was good. We rolled it out today and it starts and sounds normal. It won't build up any pressure....


What you call the "Check valve" is really the over-pressure relief.

The real check valve is a one-way valve where the tubing from the compressor enters the tank. When it's working right it opens to allow each pulse of air from the compressor to enter the tank and closes as the compressor draws another gulp of air from the intake and gets ready to pulse it into the tank.

If it sticks open, the compressor will move the same pulse of air back and forth through the tubing and pressure in the tank will never increase.

The (real) check valve doesn't have anything to pull on. It looks like a brass straight or right-angle fitting and may have a third (small) tubing connection, besides the connections into the tank and from the compressor.

There's a good chance that the check valve is frozen from condensation and cold storage. It so, it will work fine when warmed up. If not, most of these can be taken apart and cleaned up.

Don't forget to open the tank drain valve (at the bottom) and drain the moisture out of the tank to prolong its life.

Mar 03, 2015 | Dewalt Air Tools & Compressors

1 Answer

Stanley Bostitch compressor cpack model runs and runs but won't fill tank.


check for any air leaks and fix as needed. then look for oil coming from cylinder heads , if oil is coming from heads you have blown head gaskets ,it wont build pressure like this. you might also check the pop off valve to be blown open. push the pin in and see if air starts to build up then. If so get a new valve.also check the drain valve under the tank and make sure its closed.

Apr 17, 2013 | Air Tools & Compressors

2 Answers

When I start my Job boss air compressor model#cffr350b It builds pressure to set psi and stops. Then after using any air gun for a while the pressure drops and the motor kicks in and struggle and will pop...


Whats happening is the compressor is trying to start with pressure on the head/ compressor. The motor is not strong enough to over come the pressure so the motor tries to run ,may be hum a little and pops the breaker. When you bleed the pressure in the tank down the motor does not have to over come the pressure and starts up as it normally would. Now, your problem is the check valve between the tank and compressor. It needs to be replaced. It is allowing pressure in the tank back to the compressor. Thus the compressor tries to start and can't. Trace the line from the compressor to the tank. You should find the check valve screwed into the tank and the compressor discharge line screwed into the check valve. Remove the compressor discharge line,then remove the check valve. Assemble in reverse . also you can loosen the fitting at the compressor. if it blows air all the time it's the check valve for sure.

Aug 08, 2011 | Porter Cable 4 5 Gallons 150PSI Job Boss...

1 Answer

When it runs it sounds like an air leak from the engine and the tank does not fill. i do not hear air leaking when not running.


This sounds like the compression release valve is leaking. This valve bleeds the cylinder pressure to allow the motor to start without having the load on it. On this size compressor the valve is often built into the pressure switch. It is a little "pintle" type valve and you will hear hissing while unit is running but the opressure will not build up very much. When the pressure switch calls for the unit to run, the little valve closes with the switch. COntamination or other stiction keeping the valve form closing will cause the problem. You will find this near a tube that goes to the pressure switch. The switch itself hooks into the tank, but this little tube will connect to the cylinder head or the main tube from the compressor. Yours may look similar to ones at this site:
http://www.generalairproducts.com/Fire-Protection-Products/accessories-pressure-switch-a-switches-check-drain-a-pressure-relief-valves.html
The valve is also commonly called the "unloader" valve.

Jul 29, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

My compressor runs and builds pressure but, with nothing touched all of a sudden does not produce the same amount of pressure as before, it will not run my printing machine. What should I check?


Does the compressor have enough CFM to run the printing machine. Will the compressor build up pressure and shut off if you close the discharge valve at the tank. Your printing machine may simply be using to much air. If the above items are not the case you may have a faulty check valve in the receiver tank or valves going bad in the LP or HP heads. The valves may also simply have carbon build up or dirt of some type not allowing the valves to seat properly. I would start at the check valve. One way to check the check valve is to see if you have air blowing from the bleed off line at the pressure switch all the time. Another way to check is loosen the fitting at the High Pressure head an see if you have air blowing continously. Caution do not remove the fitting at the head completely. If the check valve is bad you will have high pressure air blowing until the receiver tank is drained.

Feb 23, 2011 | Ingersoll Rand Type 30 Fully Packaged Ir...

1 Answer

Coleman powermate compressor doesnt hold air


CHECK YOUR TANK PRESSURE ADJUSTMENT KNOB ON TOP A LOT OF TIMES THERE NOT SET AT THE FACTORY.HOPE THIS HELP'S

May 22, 2009 | Coleman Powermate 11 Gallon Air Compressor

1 Answer

Tank will not build pressure beyond 25 lbs. Just runs


IS YOUR AIR FILTER CLOGGED. SOUNDS LIKE THE VALVES IN YOUR HEAD ARE NOT CLOSING ALL THE WAY. THEY ARE MOST LIKELY REED VALVES, THIN STRIPS OF METAL THAT OPEN AND CLOSE WHEN THE PISTON MOVES. MAKE SURE THEY ARE CLOSING ALL THE WAY (NOT CARBONED UP). DID YOU REMOVE THE HEAD AND DID YOU PUT BACK LIKE YOU FOUND IT - NOT TURNED OR FLIPPED OVER. SEE IF YOUR FINGER WILL GET SUCKED UP TO THE INTAKE HOLE.

Apr 12, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor runs hot and won't build pressure


THE COPPER LINE IS SUPPOSED TO GET HOT, SCALDING HOT ACTUALLY. THE MOST COMMON REASON FOR COMPRESSORS NOT BUILDING PRESSURE IS CLOGGED AIR FILTER OR THE VALVES IN THE HEAD ARE BROKEN OR NOT OPENING AND CLOSING CORRECTLY. YOU MAY POSSIBLY HAVE A BAD AIR LEAK DOWNSTREAM BUT YOU CAN CLOSE THE DISCHARGE VALVE ON THE TANK TO ELIMINATE THAT PROBLEM. HOPE THIS HELPS OR GET YOU STARTED.

Mar 27, 2009 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Air compressor fills, but slows down as the pressure builds


sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

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