I bought a Cen-Tech pro code reader handheld from harbor freight. I hooked it up to my truck because it has been throwing a EVAP "gross leak" code periodically. I went to the live data monitor and saw where it has passed every EVAP test except for "Weak Vacuum Test 1" on the monitor it said it was pulling 1.2 (In H2O) and the requirement was 12.0 (In H20) it passed Weak Vacuum Test 2 and every other test that apparently the on-board monitor puts it though. My question is what could cause it to be failing the weak vacuum test, what all should have a vacuum on it? It was my understanding that the purge valve has a vacuum on it, I relocated the purge valve because it gets clogged with dirt in the factory position and I located it towards the front of the vehicle. I had to use 2 pieces of heater hose because one was not long enough. I used a brass barb and hose clamps to seal it together but I am wondering if that is where my problem is coming from.