The EVAP vent valve/control solenoid is mounted on a bracket by the fuel tank.
The EAVP purge valve/control solenoid is mounted on the front top of the intake manifold. Just behind the area where the throttle housing bolts to the front of the intake. It has an electric wires connected to it.
It is up under the truck and mounted on a bracket in front of the fuel tank.
YOU WILL FIND IT MOUNTED ON A BRACKET UNDER THE TRUCK BY THE FUEL TANK
It is located under the truck near the tank.
There are several and they are all located on the exhaust system.
where is my hood latch located on my 1999 Chevy silverado pickup
where is the transmission control system on a 1996 chevy silverado 2 wheel drive 5.7
there should be a couple of them screwed into the exhaust system.
"Where is the oil plug located for a 2008 Chevy silverado ext cab?"
In your a hole
On the 2007 Chevy, it is by the gas tank towards the middle of the box of the truck.
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no ECM's in a 1981