Almost all electric pump failures are caused by excessive heat. Reasons for excessive heat can be (1) bad ground to the pump, (2) low voltage to the pump because of undersized or pinched wiring, (3) pump being overworked due to too high a head pressure or being mounted above fuel level, (4) pump being mounted too close to a source of heat, (5) pump not being cooled adequately by the gas flowing thru it, (6) pump overworked due to pinched line or too much rubber hose in system.

To answer your question regarding a good diagonistic mechanic in CS (does CS mean Colorado Springs or Chicken S**t?), you need to ask people there.....Chevy dealer has the diagnostic ability to look at a MPFI. Also, as a basic check, are you sure the pump is the correct pressure? Second, Walboro isnt know for being the #1 quality....isnt there a compatible AC pump? TIP: AC and GM are the same products but if it is in an AC box, the price is significantly lower that the same GM part number.