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Tank pressure will not build above 50 psi - Craftsman Air Tools & Compressors

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  • redramman Oct 03, 2009

    craftsman air compressor Craftsman Air Compressor not pressurizing

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Don't know what model you have. They are all pretty similar tho. Look for the regulator should have a cover on it with a single nut in the center of the cover holding it on.Under the cover is a diaphragm and a spring. tighten the adj. on the spring the compressor will shut off at higher pressure. You don't want to exceed the max rating (ie: if is suppose to shut down at 100psi don't try to go higher.)

Posted on Oct 03, 2009

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Dewalt Emglo 55168 motor starts to slow down as pressure builds to about 30 PSI. It really starts to labor. Any thoughts as to what could be causing the motor to strain and slow?


Most likely in tank check valve is leaking or belt is slipping. Belt tension easy to check, should not deflect with thumb pressure. Check valve should not let air escape out of tank. Easy to check. Run compressor till pressure builds to around 50 psi. Then unplug machine from power outlet. Listen for air leaking out of tank. In bad cases, air will actually leak out of intake filter. Replace check valve as needed. Good luck

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How do I increase the pressure on my Flotec FP711OT-08. It is low 40s psi, can I move it up to 50 psi or high 50 psi? Water pressure throughout the house is low.


There may be a pressure setting on your outfit but My feeling is -- your problem will be low pressure on your water line. Most pressure settings is to keep from having too much pressure on what your running. For instance our city water pressure is 70 lbs but in order to keep my furnace boiler system at 16 lbs I have to install a pressure reducer.

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I have a new 1 hp utiltech pump and a new. Precharged tank with 34 psi in it now. When i prime the pump the pressure goes right to 25 psi and i can hear some water moving . When i open the shut off valve...


The 34 psi of the pressure tank sounds high, but it depends on what the cut-in pressure is set at in the pump pressure switch. Typically the pressure switch is for 20-40 psi or 30-50 psi. To establish what the pre-charge of tank should be , you need to establish what the pressure switch setting are (i.e 20 - 40 psi , etc.) Run the water and watch the pressure gauge and note at what pressure the pump comes on. The pressure tank needs to be pre charged 2 -4 psi below that cut-in pressure. So if the cut-in pressure is say 30 psi, then the tank needs to be pre charged to 28 psi.
To pre charge the pressure tank, turn the pump off. Drain the pressure tank of water to relieve all pressure in the tank. Then check the pressure of the tank at the air valve. Set the pressure to 2 psi below what the cut-in pressure is.
If you adjust the pressure switch, say from 20-40 to 30-50, you will need to go through the procedure of re adjusting the pressure in the tank. I hope this helps....

May 21, 2014 | Plumbing

1 Answer

Problem with pump?


The pump pressure switch should be checked to see what the ON-OFF pressure is set at. Typically the pressure switch is set for 20-40 psi, or 30-50 psi. The pressure tank should be purged as well. With the pump OFF, and the tank drained of water, the air valve on the tank should read approximately 2 psi below the "on pressure". So if the system operates at 20-40, the tank should be pre-charged to 18 psi. If water escapes from the air valve, the internal bladder in the tank is ruptured, and the tank needs to be replaced. A tire air gauge is used to measure the pressure in the tank after the water is emptied from the tank.. A tire air pump or a compressor is used to charge the tank. if a compressor is used, be careful not to over-inflate the tank, as this may cuase the bladder to rupture.

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1 Answer

How do I get the pressure build to 90 PSI It stops at 50 PSI not enough to use the Impact tool


There should be a pressure regulator with a gauge hooked to it. They usually have a knob that you turn to the right to increase the output pressure. If the compressor itself is not building more then 50 PSI then there is a problem with the unit.

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1 Answer

My Craftsman air compressor has wored fine till now. It does not want to build up pressure beyond 50 psi.yes I did check the drain valve and no leaks. Motor seems to be putting out the rpm's and the oil...


Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.

Feb 04, 2011 | Craftsman 1 hp Air Compressor, 4 gal. -...

1 Answer

Pressure in the tank only builds to 30 psi


Bad check valve. But I would check the regulator, by turning it down to about 10 PSI and running it and see if it builds again, if that works then it is the check valve. But from what you are saying I would replace the check valve anyways.

Jun 05, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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I have a model FP209501 Air Compressor 2 Gallon,


2 gallons is small to begin with u need to buy an in line pressure adjuster/regulator their a few bucks and can be attached to the paint gun or line and will keep the pressure at ur adjustment the regulator on the tank sets the tank pressure at 50 so when u us it will let it drop down to about 45 than start up to build the pressure up to 50 than shuts off than repeats it self the inline keeps pressure steady even if tanks are at 200 psi

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1 Answer

Comperssor losses pressure after 50psi


Locate the moisture drain valve, open and drainn any and all water fron the air tank and then run it and watch the psi it should build as normal. if this does not help feel free to contact me at davenormandeau@hotmail.com

May 02, 2009 | Air Tools & Compressors

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