I have been battling a P0442 on my 2001 S10 for over a year now. I have replaced all the EVAP components with new OEM units (canister, purge valve and vent valve) and have checked on all the lines, no leaks. The interesting part about this code is that it only pops up when I am below half a tank of fuel, but not every time I get below half a tank, maybe every other time I get below half a tank it comes up. I was thinking maybe a Fuel Pressure Sensor is to blame? Looking for some possible explanations. I am really tempted to clear when it comes testing time and not really fix the issue.
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