1996 Geo Tracker Check Engine Light

[fixkick]

after clearing the check engine light and driving for some time, the light came back on only this time I got the p0171 (engine lean) code and not the p0443; 
does this mean my evap VSV is okay? Or can both codes be caused by a bad evap VSV? what about a bad gas cap? 
Womdering if I should order a new evap vsv...

keep in mind the EVAP test does not run on a full tank of fuel.
it needs air  space above the fuel level in tank to be accurate,
evap system testing is NOT EASY,  but leaks tests are always first or cleaning and bench testing all VSV valves to is easy.
VSV is just  air valve, vacuum.   electro solenoid air valve but designed for vacuum.  and some work backwards from basic thinking,  ... type vsv in my main page, see lots of testing examples.

171  is lean code.
does the engine ACT lean?  that is first,  post all things the engine does good and bad or  ugly,   all things matter in diagnosis, (evidence matters big time) all.