Chevrolet Repair: Getting check engine code P0452, vortec engine, vent line

Question
I have a 1999 Chevy S10 4 wheel drive 4.3 Vortec engine that had the fuel pump changed 2 monthes ago.  I have been getting a check engine light code of P0452. This is the evporative emission system pressure sensor low input.  Where is this sensor located and how is it replaced.

Answer
Hi Jerry... that may not be your problem...check your fuel cap...it has a valve in it that maybe stuck open...allowing vapor from the fuel tank to release all the time. sensor should be area of the charcoal cannister on the vent line...cannister should be under hood passanger side front...or could be under truck near fuel tank...hope this helps