SES Code P0440 Evap System

[Jeremy]

Problem with my 1997 Chevy Lumina
3.1 V6
SES GM Computer codes P0440.
I keep getting a P0440 code. Is there any typical problems with the 97 luminas related to this code?

[Ken]

This code P0440 is an overall Evaporative Emission System problem.
There could be many reasons for this.
A leak in the system caused by a faulty vent solenoid in the rear of the car is a common failure, as is a loose or faulty gas cap. Try cleaning the seal on the gas cap, and the surface on the fill tube where the cap screws onto. Then clear codes.
A scanner is really needed to lool at system data, as well as control the components to find the failure. There is also a special tool to pressurize the system with nitrogen and look for leaks.

[Guest]

This code P0440 is an overall Evaporative Emission System problem.
There could be many reasons for this.
A leak in the system caused by a faulty vent solenoid in the rear of the car is a common failure, as is a loose or faulty gas cap. Try cleaning the seal on the gas cap, and the surface on the fill tube where the cap screws onto. Then clear codes.
A scanner is really needed to lool at system data, as well as control the components to find the failure. There is also a special tool to pressurize the system with nitrogen and look for leaks.