I did a lot of research and the answer is, none of the things pictured are the problem, they are leaking as a symptom of the check valve malfunctioning.

If someone orders a new check valve i'll install it and we'll have a perfectly properly functioning air compressor again.

http://www.ebay.com/itm/CV307800AV-Campbell-Hausfeld-Air-Compressor-Check-Valve-/251126507587

Also we need some oil for it:
"Chevron synthetic 5W-30, Mobil 1 5W-30 or 10W-30 synthetic motor oil. Using other types of oil will cause starting problems"

can i get some excitement about us getting a plasma cutter?

-jake

On Fri, 22 Apr 2016, hol@gaskill.com wrote:

If it's on the inlet it might be a vacuum breaker

On 2016-04-22 14:27, Jake wrote:

sudoroom has a nice air compressor.

some pictures here:
http://imgur.com/gallery/QBOG4

here is the manual:
http://www.chpower.com/IMAGES/pdfs/manual00/611301_0504.pdf

I am presently trying to figure out why it leaks air from a valve
whose purpose I don't understand.  In the meantime it is working now.

My friend is offering to lend us a plasma cutter, which is like a
welder but cuts metal instead of welding it together.  It uses
electricity and compressed air, and when we attach the business end to
the robot, we will be able to cut precise shapes out of steel of
significant thickness, making the laser cutter very jealous.

can someone print out the air compressor manual (PDF link above) and
perhaps put it in a binder so it doesn't get grimy?  We can attach it
to the compressor somehow.

-jake
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