Question about 2006 Chrysler Town & Country

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Check valve missing in fuel tank filler neck.

Last year I put STP fuel system cleaner in my 2002 nissan sentra gxe with a fuel tank as instructed on the bottle. Later that day my check engine light came on while at school and the code was a gas cap code but that wasn't the cause. I cleaned my evap canister, vaccum cut off valve, checked sensors, the whole nine yards. A different code popped up this time, p1444: purge volume valve flow at wrong time. I followed the diagnostics test to fix the problem but nothing works. I removed my filler neck at school and looked deep inside with a flashlight and I don't see my check valve anymore. What can cause that and what are the solutions to fix it? Thanks

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  • Anonymous Mar 14, 2014

    Check engine light comes on (P0456) then it will go off after about a week. It has been in to the dealer 3 times and they cannot find the problem. The gas cap and filler neck has been replaced. It still does it. Could it be electrical and not vacuum?

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P1444 Purge Flow Sensor Circuit Input Low 0
The evaporative emission control system checks to make sure there are no leaks in the lines that run from the gas tank to the charcoal canister and up to the engine. It also checks to make sure the gas cap is sealing correctly.
When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal. Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied. The emptying process is called "canister purge." Here's how it works.
The computer orders a canister purge by powering open a PURGE solenoid. That opens the vacuum line between the canister and the intake manifold. At the same time, it opens a VENT solenoid. That allows fresh air into the canister. So the engine is literally sucking out the gas vapors and purging the canister with fresh air. The computer has to adapt its fuel strategy to take advantage of all the extra gas vapors coming into the engine.
The computer notices the canister is empty when it detects a leaner condition (all the vapors are used up) and it resumes normal fuel delivery. Some car manufacturers then close the VENT solenoid but leave the PURGE solenoid open. That creates a vacuum throughout the entire fuel storage system. Once the correct vacuum is reached, it closed the PURGE solenoid and waits to see if the vacuum holds. If it doesn, the system passes the test. If it detects a leak, it sets a code.
In this code P1444, the computer sees a lower than expected value on the purge flow sensor. bottom line? replace the purge flow sensor.

Posted on Sep 03, 2009

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I have a subaru Forester 99 that works fine.But it burns a lot of gas. My mechanic told me it's my be my filler neck that cause the problem. What do you think?
Your answer is highly appreciated.

Posted on Oct 23, 2009

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Posted on Jan 02, 2017

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this forum is for usa cars, is car USA car?
the tanks just dont like siphoning. (check valve)
the FSM covers this , in the fuel section under bad pump.
1998 to 2006, ill guess, 06

i have the FSM and does not cover. bad fuel, no drain plug.

it shows how to get fuel lower, in filler neck
the tank has check valve at it its metal neck.
so inserting a hose in filler, will hit this check valve.
and all you get out , is 1/2 fuel.
id use the tank out procedure.
then empty all fuel, after step 5.
quote:
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  2. Relieve fuel pressure in fuel feed line.
  3. Due to absence of fuel tank drain plug, drain fuel tank by pumping fuel out through fuel tank filler.
  4. Use hand operated pump device to drain fuel tank.
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tip tank to drain the remainder. out

here is one more way. (IDEA!)
do 1-4
then tip car to left. Jacks then stands at frame.
then remove the filler hose on tank
remove that pesky check valve. from neck last.

and pump out the rest.

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