Air compressor & lines.

[boo coo tracks]

While trying to air up trailer tires I found a problem in trying to up 5 PSI to reach 50 lbs. Checked compressor gauge that set on 100 PSI. Drained tank in last 2 days ? Never checked drain pipe at at all aux. connections. Any ideas????????????????
My problem is that 48 lbs was all I could get in any tire on trailer which requires 50 lbs.
TIA
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[krooser]

I guess I don't understand the problem... explain it again...

 

[boo coo tracks]

Sorry I just ramble on like everybody was standing beside me, trying to figure this out.
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[akdiesel]

Have you varified that your local tank pressure gauge is reading correctly. Bleed off the tank and see if zeros out. some of those compressors have a lot of vibration and can foul up a pressure gauge.
Your regulator may be bad also. See if your pressure gauge is set to read upstream or downstream of the regulator.