The the plastic that the cap goes in . that is in the gas tube . will leak around where it is presses in you will find a little rust on the tube just inder the cap causing a small leak . just had one done. with smoke test. blamed new cap till we found the rust around the tube to plastic where the cap goes into . a ridge of rust . so a small leak. need to replace tube or seal the tube/ plastic just inside gas opening .
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Re: evap leak in fuel
Remove the gas cap and re-install it making sure that you hear it click several times. What your evap leak could be is the gas cap allowing gas fumes to escape. All it takes is a .040 leak to turn on the engine light. If it persists you'll have to have the emission system smoke tested. What happens is the system is literally filled with smoke and the leak will be found by where the smoke comes from.
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Maybe! Check your air filter, also go by auto zone, or O'Reilly Auto Parts, have them to check the engine code, it's free! Could be a bad oxygen flow sensor, or other sensor causing this! and you really need to fix that leak. hope this helps!
Evap system has many parts , cannister,vent and purge valves ,fuel tank and cap, first is the fuel cap on and is the seal in good shape. You will need to inspect all vauum hoses that leave the cannister if all ok then get the valve and solenoid tested for stuck open
Gross leak in the Evap System Yes-- when the purge valve is commanded on you are just pulling out fumes & burning them You have a major vacuum leak, thus a leaning of the fuel mix & cylinder misfires Two different systems, hard to get if don't know about that stuff
An Evap leak in a car is usually fuel fumes leaking from the evap system. The purpose of the system is to expel pressure built in the gas tank, collect the fumes, and then at the right moment, purge the fumes into the intake to be burned. On newer cars, a leak in the system will set off the check engine light. The leak doesn't have to be big... in fact, it can be tiny. As in, can't see with the naked eye, tiny. A smoke machine is usually used to find the leak. A popular cause of an evap code is a loose gas cap, as the gas tank and filler neck itself are part of the system.
This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 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.
code P0442 most likely means one or more of the following has happened:
A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
A small leak/hole in a fuel vapor hose/tube
Other small leak in EVAP system
Faulty vent o-ring seal
With a P0442, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses
Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:
1. Defective or loose fuel cap 2. EVAP canister or hose cracked- not connected 3. Purge or vent solenoid defective 4. Vacuum leak at engine
Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.
Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!