Fuel cap not venting and creating negative pressure in tank
- Mark asked this question on Chilton's DIY blog article: "How to Tell if Your Fuel Pump Needs Replacing."
Emission controlled vehicles from approximately 1972 to 2015 use mainly non-vented fuel caps.
Check your vehicle year’s application and replace the fuel cap. Scan your vehicle for related DTCs , such as EVAP (evaporative emission constrol system) codes. Check for TSBs on your vehicle.
Check your Chilton subscription for DTCs (diagnostic trouble codes), TSBs (technical service bulletins) and recall information.