As you will see in this pic, I just installed a new fuel pump on my 01'. I have a problem though. As you will see on top of the unit, it is missing one of the electrical sending units on top of the pump itself. Being a complete dumb ***, I didnt read on it where it said to keep the one off the old pump after I threw it away.My question is, can you purchase just the electrical sending unit on top of the pump? Thanks.

 

Is something like this what your looking for?
http://m.ebay.com/itm/Fuel-Level-Sensor-Sending-Unit-With-Upgrade-Harness-Connector-Fits-Chevrolet-/360485947790?nav=SEARCH

 

The fuel tank pressure sensor goes in the vacant hole: CARQUEST by BWD Fuel Tank Pressure Sensor EC2501: Advance Auto Parts


Really ought to consider an AC Delco or Delphi module though. Aftermarket modules are, uh, not worth beans and should be avoided. They tend to "cut corners" in several ways, as you found out