Hello, my name isXXXXX is possible that you have a defective cap but it is more likely that the EVAP Canister Vent Solenoid Valve has failed. Very common on this truck. To verify, use scan tool to command vent valve on/off while closely listening for audible "click" noise from fuel tank area. If scanner is unable to perform this test the remove Canister Vent Solenoid Valve from vehicle and bench test. Apply 12volts to one terminal and ground the other. If no "clicking" is heard then replace valve.
Ok I will check that out first thing tomorrow morning. How expensive is the solenoid? Do you know the GM or AC Delco part number?
I do not know part number. Approx 65-75 dollars.
Could you email the diagram and the information you posted. I just printed it out and it cuts off part of the diagram.
The vent valve is at the top right of the pic
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The above picture is still chopped off and somehow your numbers that you put on bottom of origional answer i can't see in this message window anymore
Hang on a minute
Number 2 is the vent solenoid valve
No picture or numbers at all this time
OK let me try a different way
Still no good the only number visible is 3
the upper left keeps on getting cut off when I print out the diagram
None of the diagrams have even showed a number 2 when I have printed them out
I give up, the solenoid I am referring to is to the left of the number 3 just left of the bolt head at the top of the diagram.
I appologize, I cant figure out why it wont load properly
The valve has the pipe with the 90 degree fitting going into it
I think I should be able to figure it out in the AM when I get under the truck. It has a wire and a hose on it. What are the rough dimensions?
about 6 inch by 4 inch wide
may be 2 inch thick
it will have one electrical connector with two wires in it
ok thank you. I will look in the AM
I have not given my opinion on your answer yet. I thought I had asked you the bulleting number and AC Delco part number and didn't get a response. That information would be very helpful.