33 GAL HAS TANK PRESSURE BUT NO REGULATOR PRESSURE

by SHERRY RABER
(TUCSON AZ)

33 GALLON COMPRESSOR HAS TANK PRESSURE BUT NO REGULATOR PRESSURE. WHERE SHOULD I START LOOKING FOR THE PROBLEM.


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Bill says...

Sherry, typically, there is nothing in the air line from the air tank to the compressor that could stop the air flow.

If you have, for example, 100 PSI in the tank, you can be fairly certain that that 100 PSI is reaching the regulator.

That the regulator is showing zero PSI is suggesting to me that the pressure setting is turned down so low that the air flow through the regulator, and consequently the regulator gauge reading, is off.

Can you rotate the adjusting knob in either direction? If that doesn't do anything, can you either push down or lift up on the regulator knob?

Or, maybe it's the gauge? If you cannot adjust the regulator, or in so doing the pressure gauge doesn't change, drain all the air from the compressor, swap the gauges, and turn it back on. Watch the gauges to see if any change occurs.

Post your findings here as a comment if any of this helps, or doesn't.

Cheers,

Bill

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921.166390 7 gallon Craftsman 1HP air compressor - Air stops flowing from hose after a couple of seconds.

by Frank
(New Jersey)

Hello, great site I've been looking through it but haven't been able to find my exact issue so far.

I got a 7 gallon Craftsman 1HP air compressor Model No. 921.166390

It's brand new from Sears purchased yesterday, completely sealed etc etc.

I got it in order to inflate the tires of my cars to their proper pressure here at home. Which ranges from 35-40psi depending on the car.

I put the supplied oil in, I plugged it in turned it on, set the regulator to 90 psi (recommended in the manual to do so for included accessories, which includes the tire inflator I'm trying to use)then waited for the tank to fill which takes about 3-4 mins.

Tank pressure shows 120 and the regulator shows 90 psi. I hook the air hose up using the supplied EZ connector fittings and also hooked up the tire inflator using an EZ connector.

When I tried to inflate my tires, air only comes out for a short burst of a second or two then completely stops, I know it's stopped because I can no longer hear the minor leak hissing from the EZ connector fitting or if I manually depress the tire inflator with my finger no air comes out.

The tank will then show slightly lower air in the tank than when it's full, obviously having discharged a small amount of air, and the regulator will still show 90 psi.

If I disconnect the hose from the tank then connect it again, the hose fills up with air and I can use it again but only for that short burst.

At first I thought maybe the tire pressure was too high for the tank, but I tested this by just manually pressing the inflator's pin with my finger and again air shot out for only a second or two then stopped completely.

I checked the hose for an obstruction but I could freely blow through it and the inflator with the pin depressed.

I decided to put away the compressor and try again later after re-reading the manual, which I did today. Same issue, it allows a small burst of air out of the compressor hose then completely stops allowing air to flow, unless I disconnect and plug back in the hose. Tank still shows it's full and the regulator still shows pressure, even though it's advertised as a 125 max psi I can only get it to go up to about 110 psi on the regulator and even then it only allows a short burst of air out before the air stops. I tried highest and lower psis on the regulator, but it didn't matter what I set it to.

I read the manual and nothing inside indicates I'm operating it wrong, I followed all the instructions step by stop to the tee.

My knowledge about air compressors is very limited so I figured I'd check here to see if I'm either doing something wrong, or if it's a simple enough fix to where it wouldn't be worth the hassle returning if I can fix it myself quickly. Although I don't know much about compressors I do wrench on my own cars quiet a bit so I'd be comfortable doing so on the compressor if there's a easy fix to this.

Sorry for the long winded post I just wanted to make sure I got all the information out there so I can get an accurate response.

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Bill says...

Frank, it would be helpful if everyone asked a compressor question the way you did. It makes helping quite a bit easier.

I think that you have a regulator problem. Although it dials up and down, I suspect some sort of obstruction inside that allows the air to flow freely for a second or two, then shuts the flow down.

You've done everything possible to get it to run, and everything you have done is spot on. I'd take the compressor back and ask for a new one.

Cheers,

Bill

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Craftsmans gas compressor does not idle after building pressure

Hi Bill,

I have a Craftsmans 20 gallon compressor being run by a 5hp Briggs Gas engine that I bought from Sears awhile ago. I haven't used it for awhile and it is now having issues. It will not idle after reaching the operating pressure. It will start fine and build up pressure. Then the moment it reaches the set pressure, it will stall and shut off instead of idling. The moment I hear the unloader relieve pressure, it dies. Any clue?
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If you have the manual, I would think that it has instructions about how to adjust the throttle idle assembly. I don't have any experience with this unit. If you need a manual, you may find one at:

www.searspartsdirect.com

You will need the serial or model number to check.

Cheers,

Bill

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