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

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Know tank pressure

Know matter how long the compresser runs the tank gauge won! gopass 20 pounds

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"no matter how long the compressor runs" If it's not connected to any high volume consuming devices, and that no leak has been detected...then either an head valve (checkvalve) , severed motor shaft, nor the piston/diaphragm is defective. If it does stop after a few minutes the gauge is surely defective

Posted on Jun 05, 2009

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It would help to know the year, make, model of the vehicle, as well as engine type/size. But in general, that would indicate a faulty pressure relief valve, which is usually located as part of the oil pump, which is inside the engine's oil pan. A cheap first step is to also change the oil filter and oil, as a clogged oil filter would not help matters.

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Grundfos pump switches on & off continuously with


if you have a pump for the whole house you need to check the bladder tank. there is a air valve on the top. Check the pressure with a tire gauge you should have at least 20 PSI this will stop the pump from the on and off thing.

You can compress air yuo can not compress water. thats why the ballder tank. As the pump work to shut off pressure it is compressing air. then when you use a little water the pump does not run until a large about is run then the pump will re fill the system

Best of luck

R J

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Sounds like a well fed system with a pressure tank that has lost its air charge. Check for a water tank with a tire pressure type stem fitting, should also have a pressure gauge. Most newer tanks have a rubber diaphram inside to keep the air and water from mixing, but a lot of older ones don't and the newer ones will develope a leak that will produce the simpoms you describe. Try adding a few pounds of air pressure to the top of the tank and check for leaks. Warning: Compressed air can escape explosivly if the tank is badly rusted out but if your water pressure goes to 50# without the tank leaking, it should be safe to add up to 25# of air. The air charges the water system and allows the pump to shut off until enough water is used to lower the pressure back to set points on the control switch. It's not a good idea to adjust the set points on the switch unless all parts in the system have been checked for safety to the new pressures.

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1 Answer

Craftsman compresser md 919155730


This sounds like a pressure switch failure. follow the power cord to where it enters the compressor and the switch should be there. you should be able to order a new one through sears service center. Good luck.

Jun 04, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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