Compressor won't run air tool or even pump up a tire

bill, to answer yor questions its a 2.5 horsepower 25 gallon comp. and i can barely put air in a tire.it says tank mp is 126psi.when i use tool outlet guage goes down to zero and tool runs out,when i let off trigger oulet guage goes back up to 100 meanwhile tank guage stayed at 110 the whole time. its as if not flowing right in pipes to tool. all works good until it has to flow to tool.


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Hello again Peter.

No air out of hose is the problem, and that's covered on this site. See troubleshooting your compressor on the sitemap page, and then follow the link through to the page "no air out of hose".

Typically though, if you trigger the air tool, and the regulator gauge drops right to zero, that suggests that it is the regulator itself that is the problem.

If you dump all the air, add a Tee before the regulator, install a coupler in the Tee into which you can connect the air line to your tool, and then test the tool, if the air tool runs fine then, that confirms that it is the regulator.

Bill

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Peter Laforgia • 15 days ago
Hello Bill, my tank is full and not leaking, pressure 110 in tank guage and 100 in outlet guage. when you connect air tool it drains air out of outlet guage and runs out of air but tank guage is full and not leaking. i have knob turned all the way in. after it runs out it fills up but tool only works for 5 seconds till it runs out again.

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Hey Peter... sometimes my tank is full too! :-)

OK, your compressor tank is full and the tank gauge is reading 110 PSI. The regulator is reading 100 PSI. You plug in your air tool and pull the air tool trigger and and you run out of air, is that right?

When that happens, is the regulator gauge dropping down to near zero as you are trying to use the air tool?

It would be nice to know the air tool you are using and the CFM requirements of that tool.

It would also be nice to to know what air compressor you are using, and in particular, the HP of said compressor.

You read all the pages on this site, so you know that you can get about 4 CFM of compressed air at 90 PSI for each HP of air compressor motor.

If your air tool is using more air than your air compressor can generate, then you will always run out of air, regardless of the setting on your regulator.

Cheers,

Bill

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Peter Laforgia willyr001 • 15 days ago
The tool doesn't matter it's 2.5 hp 25 gallon tank compressor and I can barely put air in a tire, and yes when tool runs out outlet guage goes to 0 and then goes back up when I let off tool, it doesn't seem to be getting full flow or something. It says tank mp is126psi

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"Bud Air" compressor wont go above 20 psi.

This is tractor 3 point hitch mounted compressor, used to run air tools,in this case air pruning tools.

This compressor worked fine and all of a sudden it would not go over 20 psi.

I dont think both intake valves could go bad at the same time. I cant find anything plugged. I have disconnected the line to the tank and ran it....no odd noises.... pulls air in hard... it just wont go over 20 psi....HELP, im stumpted!
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If you are getting strong suction on the intake, and strong output at the line to the tank, then I would suspect a gasket failure inside the pump.

When a gasket fails, it often doesn't let go until the back pressure reaches a point where it's easier to blow air through the gasket than it is to push air into the tank.

Bill

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air compressor getting hard to turn

by johnathan brown
(jacksonville FL)

my air compressor was Electronic now it is gas but when it pumps up to 50 psi it gets hard to turn and all the reeves like good.
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Is what you mean is that the compressor is bogging down at 50 PSI, Jonathan?

Assuming that the gas motor is working properly, then if the pump is loading the motor too much, that could be caused by a plugged intake, an intake or pressure valve problem, or a tank check valve bunged up. These are common issues that cause the compressor motor (whether gas or electric) to bog down.

Bill

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Jun 10, 2013
Replay
by: Johnathan

The motor is new i can let the air out and it turns fine.
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So it's got to be a pump issue. Start by removing the line to the tank check valve. With that line off, does the compressor run properly? If so, the impediment is likely at the check valve. Next, pull the intake filter to feel if air is being pulled in with force. Good suction? Then it might be the pressure valve and that means a pump tear down. If you do that, change the valve plate and any gaskets you find.

B.

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Motor/compressor stop working after 30psi and barely turns occasionally

Motor and compressor work great until 30psi reached in the tank. After that the compressor/motor stop and then occasionally turns a little. I released the pressure in the tank and tried again. Once again the compressor/motor worked good until 30psi in the tank and then the same symptoms.
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This type of air compressor issue is covered in detail on the troubleshooting pages, Robert.

Your compressor is likely bogging down due to a capacitor or power supply problem or a valve issue, whether intake, pressure or tank.

Bill

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