C3151 unloaded valve

by John Mark Roberts

porter cable c3151 compressor

porter cable c3151 compressor

I have a c3151 job boss 4.5 gallon,

Bought new pressure switch, it builds pressure until it cut out at what seems to be the right pressure but then it exhaust thru the unloading valve until it cut back on which takes about ten seconds,

Decided to check check valve and looked at diagram as where it should be and it is not there,

Thought the check valve inside parts could have rusted loose and fallen into tank,

Compressor used to work fine, is it possible it worked without a check valve.

What else could have all of a sudden changed that broke it.

I am at a loss.

Any help would be appreciated

Comments for C3151 unloaded valve

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Mar 14, 2018
C3151 check valve
by: Bill

John, the elbow where the line from the pump enters the tank has a check valve built in.

The symptoms of this C3151 compressor problem certainly suggest that the check valve in that fitting isn't working.

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