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The compressor will not build over 100 psi pressure and will not shut off

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Reciever tank holed

Compressor Piston rings worn

Will run forever because it never hits the limit on the pressure switch

Check the Reciver tank connections using a strong mix of washing up liquid and water

Apply this around the connectors and see if they blow bubbles

Check the underside of the tank in the same way , that is where the water sits and that is where the rust starts

If you cannot fins a leak you are back to the piston rings and head valves

Posted on Jul 01, 2009

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Posted on Jan 02, 2017

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1 Answer

Will a air compressor that runs at 11.8 cfm at 90 psi run at 10 cfm at 100 psi?


if it is a 11cfm compressor then it produces 11.8 cfm of air regardless of the pressure
pressure has nothing to do with cfm but with the restriction to air flow
for example the tire inflator -air hawk- has a very small cfm but as the tire restrict the air flow the pressure builds up to set pressure on the gauge
so if you want 100psi from the 11.8cfm unit just adjust the pressure switch to shut off at 100psi
Cfm is only important when using air tools as a compressor that is not capable of maintaining the cfm thereby the pressure to run the tools is not a good idea
as an example
a sand blaster that uses 11.8 cfm at 100 psi will not work on your compressor
that unit will require a 20cfm compressor to run it peoperly

Sep 25, 2017 | Psi Air Tools & Compressors

2 Answers

My D55141 heavy duty 2gal (7.6L) 150 psi max builds pressure up to around 150 releases pop off valve then keeps running, what causes this problem?


The pressure switch is either out of adjustment or has failed. The compressor should shut off at a much lower pressure than the safety valve (~100 psi)

Nov 20, 2014 | Air Tools & Compressors

1 Answer

Craftsman air compressor model 191.135131 wont build pressure


I can not find a Craftsman compressor with that model number anywhere so here are a couple things to look into. If the compressor fills to 70psi and keeps on running check the valve plate and piston/cylinder assemblies. Check that the valve reeds on the valve plate are not bent, broken or warped from heat. Then check that the wiper (oil less) or pistion rings (oil splash) are not damaged and that the cylinder wall is not scarred up. Any of these will let the compressor fill up to the point where the air pressure leaks past the valves or piston and won't fill any further. If the compressor fills to 70psi then shuts off the problem is in the pressure switch. Some have an adjustment screw or bolt to control when it turns on and shuts off. If you had a drop from 100 to 70 the springs may be weak or broke and you'll have to replace the switch.

May 22, 2012 | Craftsman Air Tools & Compressors

1 Answer

My compressor will not go over 20 psi i have a craftsman 921 4 gal 125 psi compressor and it will not build past 20 psi i do not know how to get to the pistons and stuff what do i do?


The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

Mar 01, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

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

Jan 18, 2010 | Campbell Hausfeld 04 Gallon Twin Stack...

2 Answers

Compressor 25 psi thats it


I assume it keeps pumping, but doesn't build any more pressure. That is probably bad valves or rings. If your unit has a crankcase breather, and it is puffing alot of air, look for rings. Otherwise valves.

Dec 15, 2009 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Craftsman 3 gal., 1.5 hp air compressor: won't auto shut off, builds only 40 lbs pressure, air leaks from the 2 holes in oil filler cap?


The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.

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

1 Answer

Air Compressor will not build up over 25 PSI


your max pressure switch is faulty, and shutting off the power early. replace switch, check owners manual for location(should be near power wires)

Jun 14, 2009 | Hitachi Air Tools & Compressors

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