Having problems with your Nissan 240SX ?

My 89 nissan 240 sx fuel EVAP failed the smog test

\015 I checked the fuel line for any leaks but i cant find any leaks and the hoses looks pretty good\015 Posted / edited by AnonymousUser on : 16-07-2018

Answers :

The carbon canister may saturated. If you are one to try get as much fuel as possible into the fuel tank, that may be how it happened.

Also check the gas cap. There is supposed to be a one way valve to allow air to enter into tank, but not vent out in any direction but by the vent hose to the carbon canister. That valve may be leaking. Also, there is a purge vent to the intake manifold, check to make sure that passage is clear and not carboned up.
Your EVAP system includes all of the connecting EVAP hoses and lines (NOT the fuel lines - you are looking for a vapor leak, not a fuel leak). It also includes the fuel tank, all of the fuel tank grommets and gaskets, charcoal canister, fuel filler tube, fuel cap, purge valve and vent control valve. The failure may be mechanical or electrical in nature. The system needs to be properly diagnosed.
Repair Help & Product Troubleshooting for Nissan 240SX

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