Can’t get compressor to fill over 47lbs?

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I just bought a Campbell Hausfeld HL5401 8 gallon compressor, and after break in I changed the oil.

Compressor starts, runs, cuts out and restarts fine.

The problem I’m having is trying to fill my RV tires, I can’t get it to fill over 47lbs, tanks gauge shows 120lbs and I have tried the regulator from 80 to 120. I have no leaks as pressure is not lost. Any ideas, could it be the tire chuck??
It is hard to tell where the problem lies, friend.

With tank pressure being at 120 PSI, which is a typical pressure level for this type of compressor, then, with no regulator in the discharge line, your air pressure exiting the discharge coupler would have to be 120 PSI.

Yes, it could be a faulty tire chuck or tire valve, but I doubt it. After all, if the chuck opens the valve to let air flow up to 47 PSI, unless the tire valve is closing at that pressure, the tire chuck should still flow air at the pressure coming down the line.

I suspect your air regulator gauge may not be giving you the right pressure setting, or the regulator itself may be failing.

Depending on how much time and money you want to throw at diagnosing the compressor problem, you could add a Tee to the end of the tank discharge line, move the discharge coupler to the other side of the Tee, and plumb another gauge off the Tee as a check to see what pressure is getting through the regulator.

Or, if you are careful with blowing up your tire, add a Tee before the regulator allowing non-regulated air to flow out another discharge coupler, and run 120 PSI directly to the tire chuck.

Either one would soon tell you whether it was the regulator that was the problem.

What did you decide to do?

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It’s not the sexiest looking thing it’s a sanborn motot and pump on top of a Campbell and hausfeld tanka first it wouldn’t shut off it pumped up to 150 and didn’t shut off that was the first problem the second I don’t know if it’s wired right I wired it like my other Sanborn I’m gonna get pics of everything but it’s not building presume past 30psi it’s Frankenstein now but bc I started to pull a couple things to troubleshoot and I didn’t know what to do with the check valve bc the Sanborn didn’t have one it… Read more »

I think you’re not too far from getting this to work.

Please read this page about unloaders –

That plug in the pump head is for an unloader, but unused because you have one on the pressure switch, with the tube from the check valve instead.

I can’t tell what’s going on with the pressure switch because I can’t see where the wires are to/from, and typically there is a pair from the motor and another pair from the power cord. We can work through that if you have a VOM or continuity checker.

I just inherited an Husky WL660900AJ, 1.7 H. P., 26 gallon compressor. I do not know it’s history other than it’s been used in a high humidity environment. The machine starts and runs up to about 30 psi and shuts off. It hold the air pressure at 30 psi. When I bleed the pressure off completely it does not restart even when cycling the on/off switch a few times at zero psi. It will start again after a minute or so at zero pressure and once again run up to about 30 psi. Cycling the air regulator valve pressure set… Read more »

Hi Greg. If the compressor stops at 30 PSI, but power is flowing through the pressure switch to the motor, then it’s not the pressure switch. We need to know that information if you would add a comment. Also, the regulator (if that’s what you mean by “cycling the air regulator valve”) has absolutely no bearing on when the compressor starts or stops. Reading the page on this site about air regulators will help explain what they do. In any case, please visit this page : and scroll down to the pages about air compressors that won’t build pressure.… Read more »