Hi I have a 2002 G M C envoy it have the code P0440 it does smell gas little before the gas tank can please tell me if you have a solution for the problem thank you

Hi Bruce
fault code P0440 is pointing to the evaporator system, check for vacuum leak from the tank to the evaporating valve.
Good Luck

P0440 - Evaporative Emission Control System Malfunction
Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking Tech notes Loose fuel tank filler cap is the most common cause that triggers the P0440 code.

pressure test radiator by colour check system ,or check for petrol vapour in header tank or radiator, check oil in engine to see if it is contaminated with water oil ,could be leaking rocker cover gasket causeing plugs to missfire if gas, petrol smell from water its head gasket ,water in oil headgasket, oil in water headgaskget if any of these requires head skim and head pressure test by a engineer

P0440: This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine, you will likely not notice driveability problems with this code.

P0014: This indicates a camshaft position sensor problem which could cause your driveabilty issues.

P1345: This is a crankshaft or camshaft position sensor malfunction which could also be an issue with your driveabilty, i would have this checked by a professional scan tool such as a modis.

This is an evap emission system problem. Have you tried changing your gas cap? This would be the first thing to try.
Thank you,
Lee

2003 GMC Envoy has a problem with the gas tank. The plastic tank cracks at the filler neck inlet, causing some gas leakage and code P0440. GMC replaces gas tanks for free (up to 160?).

My friend, raw gas - fuel vapors. Do you know that one gallon of gas will push a 4,000# block of steel about 20 miles?

Please have your Kia dealer investigate and repair this discrepancy for you.

Thanks for your question at FixYa.com

it means you have an evaporative emissions control system malfunction

P0440 - Evap system large leak. This code has a real common problem of the fuel fill cap either loose or the seal or check valve bad in the cap. There are also some hose and lines from the fuel tank to the charcoal canister that can be the problem. But most common is fuel cap loose or bad.

P0495 - Cooling fan rpm too high. This code sets when the control module has commanded the cooling fan rpm to zero and the rpm exceeds a predetermined amount. Your vehicle has a clutch driven cooling fan that the control module regulates through a solenoid valve. Most common problem is a stuck fan clutch which is consistant with the "jet plane" noise you are hearing. The clutch staying engaged when it should be slipping or "idling"
Good luck