Mr Slimm Posted November 9, 2010 Report Share Posted November 9, 2010 My check engine light keeps coming on for "CHECK GAS CAP". I have changed my gas cap with a brand new one. And it came back. I know its not the gas cap. Does anyone know what this could be and how to fix it? Thanks for any assistance. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 9, 2010 Report Share Posted November 9, 2010 I edited the title of your thread to remove the caps and multiple exclamation marks. That type of writing is unnecessary. I also added your year and model to the title to be more descriptive and show the AGE of the vehicle. Check the pipe that runs from your fender to the gas tank for holes and leaks, we have seen them rust out. Put your nose under the RR wheel well and smell for fuel, if you smell fuel you probably have a fuel and vacuum leak from that pipe Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Mr Slimm Posted November 9, 2010 Author Report Share Posted November 9, 2010 I edited the title of your thread to remove the caps and multiple exclamation marks. That type of writing is unnecessary. I also added your year and model to the title to be more descriptive and show the AGE of the vehicle. Check the pipe that runs from your fender to the gas tank for holes and leaks, we have seen them rust out. Put your nose under the RR wheel well and smell for fuel, if you smell fuel you probably have a fuel and vacuum leak from that pipe So if there is holes and leaks, does that whole gas tank have to be replaced? Or, is there a way to seal the leaks? If I don't smell gas or see rust, what would be my next step? Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 9, 2010 Report Share Posted November 9, 2010 Look for anything that would cause you to lose vacuum back there, hose, seal, rusted tank, pipe, Maybe a member has seen this and can suggest what else can cause this Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted November 10, 2010 Report Share Posted November 10, 2010 Check all the EVAP vacuum lines from the tank to the solenoid to the canister. Link to comment Share on other sites More sharing options...
Mr Slimm Posted November 10, 2010 Author Report Share Posted November 10, 2010 Check all the EVAP vacuum lines from the tank to the solenoid to the canister. Are those line located under the car by the exhaust lines? When you say Solenoid to the Canister what are you referring to? Link to comment Share on other sites More sharing options...
Ranger Posted November 11, 2010 Report Share Posted November 11, 2010 The EVAP (Evaporitive Emission) system pulls fuel vapors from the tank and stores them in a canister to be burned. The line runs from the tank to a canister and then to a solenoid and valve on the rear cam cover. From there a line runs to the intake manifold or the TB. You need to check all those vacuum lines. Link to comment Share on other sites More sharing options...
Mr Slimm Posted November 12, 2010 Author Report Share Posted November 12, 2010 The EVAP (Evaporitive Emission) system pulls fuel vapors from the tank and stores them in a canister to be burned. The line runs from the tank to a canister and then to a solenoid and valve on the rear cam cover. From there a line runs to the intake manifold or the TB. You need to check all those vacuum lines. Would those be the 3 silver lines running under the middle of the car? Link to comment Share on other sites More sharing options...
Ranger Posted November 13, 2010 Report Share Posted November 13, 2010 Not sure. One might be fuel supply, another fuel return and the third MIGHT be the EVAP line. Following where they go to would tell you. Link to comment Share on other sites More sharing options...
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