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Code P0455

Had fuel pump replaced then bought manufacture gas cap replaced relay 3 weeks ago now gas cap light is popping up engine light is on and is running worse everyday please any advice would be great
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Smoke machines are often used to detect and fix EVAP system leaks
You could also have a fuel tank leak, which is possible given your recent fuel pump replacement
Also the EVAP canister fuel vent valve could be inoperative.