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probably the heater core hose under the hood going to probably a broken heater core ..I bet as a mechanic and a car salesman I am 100 % correct..LOL..You will see how correct I may have been ,,Hang in there ,,it happens
You "could" remove the bed, or just lift it high enough to work on the tank. There are 6 or 8 bolts depending if it is a short bed or long bed. But you should undo the 2 straps from underneath, the filler tube from the gas cap filler, and lower the tank with a jack. Another problem these trucks have is the wiring connection to the sending unit/fuel pump assembly. GM recommends to replace this harness end when you work on it. (about $12.00 for the harness connection). These sending units/pumps retail about $300-$400, but you can find them on line starting about $120.00.
Hi Wayne, what you do is turn the key to the "on" position and back to "off". Do this three times. The engine light will flash. It will flash a certain amount of times, pause, then another set of flashes. The first set of flashes is the first number of your code. The second set is the second number. For example, you see 5 flashes, your first number of your code is 5, and so on.