I have a vacuum leak in my 2003 Powerstroke 6.0 that I've been trying to trace, the vacuum pump runs constantly. So far I have replaced hub seals, o-rings, locking hubs, vacuum lines to hubs, 4x4 solenoid, and vacuum pump. Both hubs, and the reservoir hold vacuum with a handheld vacuum pump and all the lines have been replaced and test ok. While tracing all vacuum hoses from the reservoir I noticed hissing and felt air coming from around the line going into the air conditioning evaporator (see pictures); would that be part of the vacuum system? I've noticed in pictures on the internet that there is some type of putty or seal around that line, but I wouldn't think that missing couldn't be causing the leak. I have tested everything else and running out of things to look for. Any advice is greatly appreciated...
badman2860
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