Not getting enough air pressure

by tom
(bancroft ontario)

Hi i'm new to compressors I have a 42 gallon tank and a 2horse motor it was given to me from a friend it was made from a 2 horse mastercraft compressure and the motor is electric and the parts are all new the, trouble is it builds up pressure and shuts off at 115 psi and comes back on at 90 psi but when I hold my finger over the blow gun I can stop the air flow {no pressure} and I don't know what or how to fix the problemneed it to spray things so if theres someone that can help please do so asap been reading tons of stuff of stuff but still can't find a cure thanks

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Bill says...

Hey Tom:

I did answer your first submission already, so here's the same advice. Others are welcome to contribute too.


If there is air in the tank, the upstream gauge shows pressure, the regulator gauge shows 115 PSI pressure too, then there is air getting to the regulator.

Assuming that you had air coming out of the compressor to your paint gun before (is this so?) then something has changed.

It were me, I'd turn the pressure down to about 7 PSI on the regulator first.

Then I would look inside the discharge coupler.

With safety goggles on please), and again, very carefully, I would insert a small blunt object (pencil perhaps) to try to unseat the ball check inside the coupler at the back of it. Does air flow out when you do this?

If so, you now know that air is getting out of your air compressor properly, and assuming that you air line connector fits the coupler properly, you will have air flow into your air line.

Disconnect the coupler from the spray gun connector, and again, very carefully, push the ball check inside the coupler at the end of the air line to see if air bleeds out. If yes, the problem is in the valve in your gun.

I'm not a paint gun specialist, but if it is the gun, then I suspect it wasn't properly cleaned last use, and paint has gummed up the works.

Good luck.

Bill