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Post by mybaby on Jul 9, 2014 21:59:54 GMT -6
Last week, after my '01 4.0 sat for a couple of days, I noticed after starting I get the message "Check Gas Cap". I had been having a bit of trouble removing and reattaching the cap lately, so I purchased a new cap from the Chevy dealership nearby. I still get the message, so I decided to clean around the opening with rough sandpaper to make sure that I was getting a good seal. My problem still exist although I can clear it on the DIC. What am I missing here? Has anyone had this problem? I need help.
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RCA1186
Administrator 
Rob
Go Pack Go!
Posts: 4,837 
Staff Member
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Post by RCA1186 on Jul 10, 2014 6:10:04 GMT -6
You might have an evap leak somewhere else in the system. IIRC the car senses that the gas cap is off through a pressure sensor that measures the pressure in the tank.
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Paulaurora
Super Moderator 
Posts: 3,828
Staff Member
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Post by Paulaurora on Jul 10, 2014 9:44:53 GMT -6
The check gas cap is like Check Engine light but it shows msg on the dic. You need to try to reset the code with the tool or it should reset it self in few days if everything is good.
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98redaurora
Aurora Driver
This is not your fathers Oldsmobile.
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Post by 98redaurora on Jul 10, 2014 22:40:57 GMT -6
My car has a different issue. When I go to the pump, I have to pump at like 50% to 70% flow, or else the pump shuts off. It's annoying.
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Paulaurora
Super Moderator
Posts: 3,828
Staff Member
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Post by Paulaurora on Jul 11, 2014 8:23:21 GMT -6
98redaurora you might need to replace canister close valve and/or vent valve . The tank is not venting properly
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98redaurora
Aurora Driver
This is not your fathers Oldsmobile.
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Post by 98redaurora on Jul 11, 2014 14:44:14 GMT -6
Yeah I knew something like that was bad.
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