Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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3gal. aircompressor - craftsman model #921153101

Replaced regulator and now i get bleeding thru the regulator when the tank is full and no airline is attached....when i hook a airline up the air stops leaking....why ?? replaced old regulator and that one now bleeds thru also....never had this problem before i replaced the old regulator now they both bleed don't get it....any hep would be appreciated.

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This problem is not uncommon with small compressors and the inexpensive plastic regulators they use nowadays. The one surefire way to stop it is ti install in in-line valve before the regulator outlet, even if it involves the double ended & threaded brass soupler so they both fit on. This way you can just turn the handles across the line effectively shutting off air flow. I have two pancake compressors and ended up doing the very thing.

Then when time comes to hook up a hose and tool, just switch the handle back and you have air.


Posted on May 22, 2009

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Try a better quality quick connect

Posted on Apr 24, 2009


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My craftsman 3gal. compressor starts and run but no pressure is building just keeps running and the gauge remains at 0 psi.

Is the petcock down below open or closed? If open, then screw it closed. Also, is the compressor portion connected to the motor working as it should? As the motor reciprocates, it should operate the compressor piston that pumps air pressure into the tank. Maybe something is broken there.

Nov 04, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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I have a craftsman air compressor 3 gal. 1 HP model#921.153101 the gauges go to about 45 and stop but the unit keeps running.I've checked for leaks there are none I left the air in the tank over night...

It sounds like a bad gasket. Either the one between the valve plates or the one between the head and top valve plate. The top gasket is the most common one that fails. If the middle of the gasket is broken, where it separates the intake from the exhaust, you will get symptoms just as you described. Will only build up a small amount of pressure. Here is a link to look at the parts diagram and to order parts from.

Jul 15, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

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Air is leaking through high pressure side of IR type 30 T7 compressor and out the intake filter,,what is the cause of this? Bad valve?

Air compressors generally use a check valve at the tank to prevent loading of the compressor at start of cycle. Easy to check. With unit powered off and pressure in tank remove fitting from compressor to tank and test for leak. Check valve is uaually brass or steel and can be removed and sometimes cleaned. If faulty, replace with generic valve available thru If you find that your airline from pump to tank is full of carbon deposits, you will most likely need to clean airline and decarbon headvalve area. Even is tank checkvalve is leaking, valves at head should hold pressure. Since your pumps leaks thru intake indicates valves are not holding pressure. Good luck with your prepair.

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I have a Sears evolv 3 gal air compressor that will not inflate a auto tire, even a partially de-flated tire. I let the pressure build to 100 psi and checked all fittings. Still wil not do it. Compressor...

The evolv air compressor was primarily designed to power a very small nailer. The pressure regulator (knob in front) should be turned clockwise till it stops to attain full pressure. At this setting it should air your tire. If not you may have a defective regulator. There is a trick to get full pressure from your tank. Notice the small pressure safety valve on the side of the unit. You could remove this valve and install a fitting giving you two ports. One for the safety and other for a quick disconnect. This second port will give you access to tank pressure without going thru the pressure regulator. This mod is safe because you still have access to regulated pressure when you need it. Good luck

Jul 07, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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How do i replace belt

The image below is an exploded view of the motor on the 3gal 1.5hp craftsman compressor. There are no belts for this model.
For more info check out the link I provided

hope this helps.


May 30, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Put a goodrige hose on front brake but cant get it to bleed.yamaha xvs 650 brakes were fine before i put the hose on.

I had same problem, i ended up reverse bleeding it with airline at work. Regulated pressure down to about 5 psi, then attached hose prefilled with brake fluid between bleed nipple and airline trigger and gently sqeezed trigger till fluid came out in resevoir.Helps that i work in a hose distributor and have all the hose and fitting to hand mind. hope this helps

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Have the 3gal model. For the longest the highest

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Nov 24, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Craftsman compressor won't start

There are several things that can cause your problem. Using an extension cord of insufficient rating, a failed capacitor, a failed motor and last a faulty unloader valve.

The extension cord is easy to check so I'll skip it.

The unloader valve is easy to check. It will cause this problem when the unload fails to discharge the pressure remaining between the tank check valve and the cylinder. It is the sudden release of pressure when the tank has reached it's max psi. If it doesn't release the piston has to work against the max psi. from a dead start. Most of the time a compressor will run really slowly then trip the breaker but your compressor is well please don't take this personally it's a girlie compressor.
Simply loosen one of the fittings on the tubing that run between the compressor head and the switch to bleed off any pressure manually.

If you have no pressure release then most likely it's the starting capacitor.

Below is a link where you should be able to get a new capacitor.
However I would like you to remember this your compressor is not built to last. In fact it is commonly referred to as a throw away. So before you spend anything you might want to ask yourself how much do you use it. If you use it a lot now or are planning on using it more in the future you may want to replace it with something a little better built.
Hope this helps

Nov 19, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer


The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from Good Luck with you repair and email if you have more questions.

Mar 21, 2009 | Craftsman Air Tools & Compressors

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