Question about 1989 Plymouth Voyager

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Fuel tank has an extra outlet that is capped off. cap is leaking. are these rubber cap available. why was this done? this small tube looks as if it comes from the top of the tank down the side then extends outward about 4 inches with a factory crimped on rubber cap.

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Clean outlet go get gasket sealer apply let set a few hours shouldnt leak

Posted on Jul 22, 2009

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P0455 vac leak


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.

Jan 12, 2013 | 2006 Chrysler Pacifica

2 Answers

2003 chevy 1500 has a code that says large evap leak. Where do I find this leak?


"Where" to find the leak is in your evaporative emmissions system. Most of the time, a good visual inspection will turn up the culprit. First, check the fuel cap. Look at the rubber O-Ring that seals it against the fuel fill tube. If it is cracked or looks like it is crushed down, replace your fuel cap. If that all looks OK, then you can check the rest of the system for obvious cracks, or leaks. Start with the Evap Purge line. You can identify this in the engine compartment as a plastic vacuum line about 5/16" in diameter and it has a service port on it with a green cap. Check the plastic line for cracks. Then check the rubber components that connect to this line on both ends. One end will go into the Purge Solenoid and the other will go into a steel line that runs along the frame rail under the vehicle. Follow this steel line to where it goes and inspect all connecting hoses, tanks, etc. there will also be rubber hoses at the fuel tank area and some that connect to the fuel fill tube. Check all of these for any visual signs of damage or leaks. Also check for badly corroded metal parts - especially near the fuel fill tube. Sometimes the metal tubes get rusted through and cause leaks.

If a thorough visual inpection does not lead you to a suspect, then the system will have to be "smoke-tested". This is where the system is filled with smoke under a slight amount of pressure so the leak can be seen where the smoke comes out.

Feb 23, 2011 | 2003 Chevrolet Silverado 1500

2 Answers

Check eng. light is on, scanner sais small emissions leak, replaced rubber connecting lines already. Help


Small emission leak would indicate to me that the exhaust is leaking, maybe, throwing off the O2 sensor.

If it's an evaporative leak, then I would make sure the gas cap is on tight, and that the filler tube is connected with a vapor tight connection to the tank, and that the tank has no leaks in it.

What was the code, exactly, if I might ask?

Jan 14, 2011 | 1999 Jeep Cherokee

2 Answers

Codigo p1440


EVAP System Vent Circuit Malfunction

This diagnosis detects leaks in the Evaporative Emission (EVAP) purge line using of vapor pressure in the fuel tank. The EVAP canister vent control valve is closed to shut the EVAP purge line. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank. If pressure increases, the Engine Control Module (ECM) will check for leaks in the line between the vacuum cut valve and EVAP canister purge volume control solenoid valve.

Possible causes
- Incorrect fuel tank vacuum relief valve
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve
- Foreign matter caught in EVAP canister vent control valve
- EVAP canister or fuel tank leaks
- EVAP purge line (pipe and rubber tube) leaks
- EVAP purge line rubber tube bent
- Blocked or bent rubber tube to EVAP control system pressure sensor
- Loose or disconnected rubber tube
- EVAP canister vent control valve and the circuit
- O-ring of EVAP canister vent control valve is missing or damaged
- EVAP canister is saturated with water
- EVAP control system pressure sensor
- Absolute pressure sensor

Possible solution
- Loose fuel filler cap
- Leaking fuel filler cap


Hope helps (remember to rate this answer).

Jan 05, 2011 | 2000 Hyundai Sonata

1 Answer

I HAVE A CODE PO440" EVAP EMISSION CONTROL SYSTEM LEAK" ( Small ). Is this a serious problem and what do I need to do to fix the problem?


not a serious problem at all, in fact if u have no emmisions testing u dont have to do **** with it. evap means evaporative emmisions system which is a system that stores fuel vapors that build pressure in ur tank so they dont leak out into the atmosphere, then when the time comes the cars computer purges the vapors into the motor to burn it properly.even if u take ur car to a shop chances are they wont be able to find a small leak. chances are it could be gas cap related. heres what i would do. take the gas cap off and look down inside the filler tube right there in the opening. if its palstic in there then look for any cracks. make sure theres no rust on the cap sealing surface and for the cost get a new gas cap from the parts store. put a little vasoline on the rubber seal of the new cap and put it on. remember it could take a week or more for the light to go out even if the problem is fixed.

Aug 25, 2010 | 2006 Chevrolet Equinox

1 Answer

Obd-2 code p1455


DTC P1455 - Substantial Leak or Blockage in Evaporative Emission Control System

The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).

Check this possible causes:
After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
EVAP canister purge valve stuck closed
Damaged EVAP canister
Damaged or missing fuel filler cap
Insufficient fuel filler cap installation
Loose fuel vapor hose/tube connections to EVAP system components
Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
Canister vent (CV) solenoid stuck open
Mechanically inoperative fuel tank pressure (FTP) sensor


Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank

Tell us news.

Jul 19, 2010 | 1996 Ford Explorer

4 Answers

The code is p0442 what dose that mean and what part do i need


this is a small leak in the evaporative emission control system.Most common cause is a loose or faulty gas cap but not always, Sometimes the check valve in the gas cap doesn't seat properly allowing the gas tank pressure to bleed down. The EVAP system needs to see a positive pressure in the tank.

Jun 05, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

I had an emission test done on my 98 bonneville and it failed because code P0440 evap control system what should i do ?


Here's list why your car is coming up with this code. It could be any of these things causing it.
DTC detecting condition:
  • EVAP control system has a leak.
  • EVAP control system does not operate properly.
Possible cause:
  • Incorrect fuel tank vacuum relief valve
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close.
  • Foreign matter caught in fuel filler cap.
  • Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve.
  • Foreign matter caught in EVAP canister vent control valve.
  • EVAP canister or fuel tank leaks
  • EVAP purge line (pipe and rubber tube) leaks
  • EVAP purge line rubber tube bent
  • Blocked or bent rubber tube to EVAP control system pressure sensor
  • Loose or disconnected rubber tube
  • EVAP canister vent control valve and the circuit
  • EVAP canister purge volume control solenoid valve
  • EVAP canister purge volume control solenoid valve and the circuit
  • Absolute pressure sensor
  • Fuel tank temperature sensor
  • O-ring of EVAP canister vent control valve is missing or damaged
  • Water separator
  • EVAP canister is saturated with water
  • EVAP control system pressure sensor
  • Refueling control valve
  • ORVR system leaks
  • Fuel level sensor and the circuit

Apr 01, 2010 | 1998 Pontiac Bonneville

1 Answer

Check engine light is on for emission evaporator failure-large


P0455 - EVAP Control System Leak Detected (No Purge Flow or Large Leak) The PCM monitors the complete EVAP control system for no purge flow, the presence of a large fuel vapor leak or multiple small fuel vapor leaks. The system failure occurs when no purge flow (attributed to fuel vapor blockages or restrictions), a large fuel vapor leak or multiple fuel vapor leaks are detected by the EVAP running loss monitor test with the engine running (but not at idle).
  • After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
  • Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube
  • EVAP canister purge valve stuck closed
  • Damaged EVAP canister
  • Damaged or missing fuel filler cap
  • Insufficient fuel filler cap installation
  • Loose fuel vapor hose/tube connections to EVAP system components
  • Blockages or restrictions in fuel vapor hoses/tubes (items also listed under disconnections or cracks)
  • Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked
  • Canister vent (CV) solenoid stuck open
  • Mechanically inoperative fuel tank pressure (FTP) sensor
Check for audible vacuum noise or significant fuel odor in the engine compartment or near the EVAP canister and fuel tank. ----------------------------------------------------------------------------- HX43 DTC P0457: CHECK FOR MISSING OR LEAKING FUEL FILLER CAP
  • Check for missing fuel filler cap.
  • Check for loose fuel filler cap.
  • Check for possible cross-thread fuel filler cap condition.
Is a fault present concerning the proper installation of the fuel filler cap? Yes No REPLACE cross-threaded or damaged fuel filler cap. RECONNECT and TIGHTEN the fuel filler cap only one eighth turn so that the cap initially clicks by sound or touch. CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test . If DTC P0455 or P0457 is present, Go to HX44 . CLEAR Continuous Memory DTCs. COMPLETE an Evaporative Emission Running Loss Monitor Repair Verification Drive Cycle (refer to Section 2 , Drive Cycles). RERUN Quick Test .

For DTC P0455 still present: Go to HX44 .

Otherwise, INFORM the vehicle owner that it is important and necessary to immediately install the fuel filler cap after every refueling event. HX44 DTC P0455: VISUAL INSPECTION FOR SUBSTANTIAL EVAPORATIVE EMISSION SYSTEM LEAKS
  • Check for missing fuel filler cap. If the cap is loose DO NOT DISTURB EVAP system.
  • Verify that both the input port vacuum hose and EVAP return tube are attached to the EVAP canister purge valve. Note: If the EVAP canister-CV solenoid assembly is not accessible during this pinpoint test step, GO to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions.
  • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
  • Visually inspect for disconnected or cracked fuel vapor hoses/tubes between the intake manifold, the EVAP canister purge valve, the EVAP canister, the fuel vapor vent valve assembly and if applicable the fuel vapor control valve tube assembly.
  • Check for damage to the fuel filler pipe and the fuel tank.
Is a fault indicated? Yes No CONNECT or REPLACE fuel vapor hoses/tubes as required. REPLACE damaged EVAP system components (fuel filler pipe, fuel vapor vent valve assembly, fuel vapor control valve tube assembly, EVAP canister purge valve, FTP sensor and EVAP canister-CV solenoid assembly) as necessary. REFER to Evaporative Emissions, Section 303-13 in the Workshop Manual for removal and installation instructions. GO to HX45 . GO to HX45 . HX45 DTC P1443 and P0455: CHECK FOR EVAPORATIVE EMISSION SYSTEM LEAKS
    Note: When checking for leaks or blockages in the EVAP system, energize (close) the canister vent (CV) solenoid through the scan tool for a maximum of nine minutes per pinpoint test step. Then de-energize the CV solenoid prior to performing the subsequent pinpoint test step. This is done to assure proper closing of the solenoid.
  • Disconnect and plug the EVAP return tube (EVAP canister purge valve to intake manifold) at the intake manifold vacuum source.
  • Connect scan tool.
  • Key on, engine off.
  • Access VPWR PID. If the voltage is not 12 volts or greater, GO to HX61 .
  • Locate evaporative test port [marked EVAPORATIVE SERVICE PORT DO NOT USE UNREGULATED PRESSURE ABOVE 6.89 kPa (1 PSI)] near EVAP canister purge valve or EVAP canister.
  • If vehicle is not equipped with the evaporative test port, GO to HX50 .
  • Install the Rotunda Evaporative Emission System Leak Tester 310-F007 (134-00056) or equivalent at the evaporative test port.
  • Close CV solenoid by accessing Output Test Mode on the scan tool.
  • Select ALL OFF mode and push START button.
  • Regulate the nitrogen or argon gas pressure on the tester to 3.48 kPa (14 in-H 2 O).
  • Follow the instructions that come with the EVAP System Leak Tester and pressurize the EVAP system.
  • Perform the EVAP system leak test.
Does the pressure on the EVAP system stay above 1.99 kPa (8 in-H 2 O) and pass the leak test? Yes No GO to HX46 . REMOVE the EVAP System Leak Tester from the evaporative test port and REINSTALL the test port cap. GO to HX50 .

Apr 15, 2009 | 1999 Lincoln Town Car

1 Answer

My taurus failed due to code p0442 ecap emiss ctl sys leak detected (small leak)


    Continuous Memory Diagnostic Trouble Code (DTC) P0442 indicates that a fuel vapor leak has been detected [as small as 0.10 cm (0.04 inch)] in the Evaporative Emission (EVAP) system.
    Note: Prior to performing the following diagnosis inspect the Canister Vent Solenoid (CV) for contamination. A situation may exist where contamination holds open the Canister Vent (CV) solenoid enough to set DTC P0442 and also plugs the port to atmosphere enough to keep system from being vented quickly.
    • After market parts and accessories nonconforming to the EVAP system specifications.
    • Damaged, cross threaded or loosely installed fuel filler cap.
    • Small holes or cuts in fuel vapor hoses/tubes (EVAP canister tube, EVAP canister outlet tube or EVAP return tube) in the EVAP system.
    • Loose fuel vapor hose/tube connections to EVAP system components.
    • EVAP system component [EVAP canister purge valve, fuel tank pressure (FTP) sensor, canister vent (CV) solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly] seals leaking.
    • CV solenoid partially open when commanded closed.
    • EVAP canister leaking.
  • Check for presence of fuel filler cap.
  • Verify that the CV solenoid is properly seated on the EVAP canister (if possible).
  • Visually inspect for cut or loose connections to fuel vapor hoses/tubes in following locations:
    • EVAP canister to EVAP canister purge valve.
    • EVAP canister to fuel vapor vent valve assembly.
    • fuel vapor control valve tube assembly to fuel tank (if applicable).

Jun 26, 2008 | 1997 Ford Taurus

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