Question about 1999 Buick Regal

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My 1999 buick regal wont pass echeck. it says evap system leak (small). i had the filler neck fixed and then had my system smoked and my mechanic found no leak but the service engine light remains on. ive drivin it sparingly since because my plates are expired. anyone know why my engine light wont go off????

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There is a leak somewhere all it takes is a pin whole to set it off had audis that did that sounds like a pain but you will have to check every line or replace them all

Posted on Oct 11, 2010


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1 Answer

Location for 2006 buick rainier EVAP purge solenoid

You should have an EVAP leak test done . It could be a leaking purge valve , you could need a new gas cap as well or it could be the fuel filler neck . or assorted hoses or the fuel tank pressure sensor . If the check engine light is lit there will be a code .
DTC P0442: Evaporative Emissions (EVAP) System Small Leak Detected or
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most of the time a small evap leak may be due to a bad gas cap but other times it could be a line or rusted filler neck or other problems. the best way to find such a leak would be with an evap smoke machine, thee machine pumps smoke into fuel tank and lines for evap system and with vent valve shut the system should be air tight, then you look for smoke and where smoke is that is your leak, most repair shops have the machine, note : some leaks are so small the smoke can not be seen ,at this point soap water in a spray bottle is helpful, spray lines and other areas to see bubbles.

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I believe your code is a either an evap gross leak or small leak. Most Chrysler products had problems with the fuel vapor lines from the engine compartment to the tank leaking fumes. Usually at the ends of the lines where they are rubber rather than plastic. If you live in the northeast I have seen the filler neck tubes rust and become porous creating a small leak. Check the lines near the fuel tank first. Unfortunately these leaks are not always obvious and you will have to find a shop that has a smoke leak detector. There are other parts such as evap switches and solenoids that may not be functioning and may vent the system prematurely. Then there is the fuel cap. If the seal on it or the filler neck tube are damaged it will allow fuel vapors to escape into the atmosphere. Sorry there is no definitive answer but now you have an idea where to look.

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I recently purchased this 1999 Chevy Blazer and it wont pass inspection because the OBD2 Diagnostic trouble code states it's problem is, code P0440-Evaporative Emission System. The guy said it looks like...

The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The VCM monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated.

The following conditions can cause this problem:
* A disconnected or malfunctioning fuel tank pressure sensor
* A missing, malfunctioning, improperly installed, or loose fuel cap
* A disconnected, damaged, pinched, or blocked EVAP purge line
* A disconnected or damaged EVAP vent hose
* A disconnected, damaged, pinched, or blocked fuel tank vapor line
* A disconnected or malfunctioning EVAP purge solenoid
* A disconnected or malfunctioning EVAP vent solenoid
* An open ignition feed circuit to the EVAP vent or purge solenoid
* A damaged EVAP canister
* A leaking fuel sender assembly O-ring
* A leaking fuel tank or fuel filler neck

Any of the above conditions can set a DTC P0440.

I’m happy to help further over the phone at

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The EVAP control system includes the fuel tank, fuel filler neck, gas cap, charcoal cannister, evap diagnostic solenoid, purge solenoid, all of the connnecting hoses/lines, ECM and related wiring. Anything that contains fuel that may evaporate (EVAP).
Does the vehicle have a P code for some EVAP problem, like large or small leak, or vent path blocked? Do you have a problem filling the fuel tank or is the Check Engine/ MIL lamp illuminated? If there is a larg or small leak the best way to identify where the leak is located is to use a smoke machine which creates smoke and introduces it into the system and you look for the leak.You will need to close the evaproative diagnostic solenoid using a scan tool or a jumper harness.

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I have a 1999 3.8L Buick engine. The filler neck has a large o-ring and twists into place on the front top of the valve cover. The filler neck only needs about a half-turn to be in posiiton. It is keyed with pastic tabs on the neck so it only goes in one-way. Let me know fi this helps or you need more infromation.

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