Installed Gates o-ring kit, still leaks.
does air control valve threads supposed to have teflon tape?

 

depends on where its leaking from. when i rebuilt mine with toyota parts. i didnt use teflon on anything.

 

I'm having issues with mine as well. Used all toyota parts but its still leaking. Looks horrible with that fluid everywhere. I'm in the middle of a 5 speed swap, ome suspension and por-15 treatment so the pump will have to wait a bit.

 

truck has set for two days. does not seem to be a gravity drip. only leak is under pressure, from pump down.

 

If it only leaks under pressure, it's probably the "banjo" fitting where the high pressure line attaches to the side of the pump. I stopped mine from leaking there by applying a thin layer of hi temp RTV to both sides of the fitting, reassembling it, and letting it cure for 24 hours before starting the engine and applying pressure to it. Don't use too much; you don't want it to get into the valve mechanisms.

 

You did use new crush washers on the banjo fitting??

with the pressure it does not take much to cause a leak a little piece of grit will cause it to leak.

 

Yes, new banjo gaskets