Question about Air Tools & Compressors

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Motor runs but tank will not fill up with air.

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Maybe the drain hole in the tank bottom.
Check to see if it's open.

Posted on May 02, 2015

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Posted on Jan 02, 2017

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I have a 5 HP Coleman air compressor. I was using it to provide air to my plasma cutter which requires 60 psi to operate. Basically, air compressor's motor keeps running, but it's stopped creating air...


You did not list model number, however if you have oilless type check the cylinder/piston by manually turning crank until piston is at top and examine cylinder for wear or scratches. If worn replace cylinder kit for full pressure. If ok check reed valves /valve plate for wear or broken reeds. If oil bath type, problem is usually air leak or reed valves / valve plate. As a general rule, you can keep track of wear by noting how many minutes it takes to fill the tank to cut-out. As the compressor wears it will take increasingly longer to fill. When new, and depending on tank size/ hp, most compessors fill within 2 ~ 5 min. Good luck

Sep 24, 2010 | Coleman Air Tools & Compressors

1 Answer

I have a Central Pneumatic, 21 Gallon, 3HP air compressor. The compressor is exiting air through exthaust port.


If air leaks when motor is off, fault most likely in-tank check valve. Follow discharge air line from pump to tank. Brass/steel valve at tank is the check valve. Remove hose to valve and check for leak. Replace as needed. If air is leaking while motor is running fault could be reed valves in head. Faulty reed valves in head, or torn head gaskets will cause very hot discharge air and tank will most likely never fill to shut off (or take a very long time to fill)

Sep 06, 2010 | Air Tools & Compressors

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Tank starts to fill then motor stops


disconnect line out from the compressor, run unit for about 5 to 10 min. if no problem. I would say that your tank valve is in wide open. replace it. the valve must close on ever down stoke so air don't feed back. this valve is screwed into your tank at lines end- good luck

Oct 15, 2009 | Craftsman Air Tools & Compressors

1 Answer

Is there an air bleeder valve for removing air after flushing the radiator on a 2002 gmc envoy with a straight 6cyl engine?


No. Fill up the the radiator run it for about 5 min open cap and fill it up some more. Then run it like normal for a day or so. then pull off cap again and make sure its still full. what happens is when it runs all the hoses and everything fill up. there is no bleeder but there is an overflow clear tank. it looks like a windshield washer fluid tank. it has 2 marks on it. One when the motor is hot full and the one when the motor is cold. full.

Sep 26, 2009 | 2002 GMC Envoy

2 Answers

With tank empty I can't use the full pump pressure of the gas pump. Nossle stop like tank is full enen when I first start to fill the tank.


check for clogged fuel vent on fiel tank, it has a charcoal cannister that is vent for the tank, probably clogged... please rate my help, thanks...

Aug 05, 2009 | Hyundai Motor 2002 Sonata

1 Answer

Starter valve dont close hatachi ec119sa (air compressor)


The start valve gives your motor a running start before the motor begins to load as the pressure increases from an empty tank. The motor strain is more profound when there is pressure in the tank. If you plug the valve, the motor will instantly encounter a heavy load because it has to force air into a partially filled tank. This extra load without the valve will shorten the life of the capacitors and motor windings. There could be two problems with your unit that can revealed by test. What actually closes the valve is a certain volume of air produced by the compressor. If the compressor is not pumping to full efficiency or there are leaks in the discharge hose the valve will not close. Or the valve is faulty. With an empty tank, plug the valve and run compressor and test airline for leaks with soapy water. If no leaks, empty tank of air and restart compressor and take note of the amount of time it takes to fill the tanks to shut off. If it takes an unusually long time to fill, then the compressor probably has valve problems causing low air volume. If the compressor fills to shut off in a short time frame as compared to a similar model then replace the valve. Leaking valves in the head will also cause the pump and discharge tube to run very hot. Parts are available at www.toolpartsdirect.com Good luck with your repair.

Apr 01, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

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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