Question about 1995 Mercury Grand Marquis

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HELLO, IM GETTING STRONG GAS FUMES IN THE INTERIOR AND THE TRUNK OF MY 1995 GRAND MARQUIS. I HAVE CHECKED THE ENTIRE CAR FOR LEAKS AND FOUND NONE. I HAVE CHECKED THE TANKAND ALL THE FUEL LINES INCLUDING THE RETURN LINES AND THE FILLER NECK. ALL GOOD. I ALSO CHECKED FOR CRACKED OR BROKEN VACUME LINES AND THOSE ARE ALSO GOOD. THE FUMES GET STRONGER WHILE MOVING WITH THE WINDOWS OPEN. IM AT A LOSS. NO CHECK ENGINE LIGHT AND CAR RUNS GREAT. STILL GETS 21 MILES PER GALLON WITH 199,689 MILES AS OF TODAY. FUMES HAVE BEEN PRESENT FOR 5 OR 6 MONTHES. COULD I HAVE CLOGGED VAPOR CANISTERS AND HOW CAN TEST. ANY IDEA WHAT ELSE IT COULD BE OR WHERE IT COUD BE COMING FROM. THANKS, CHUCK

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  • chucksemon Sep 10, 2009

    HELLO, THE FUMES IM GETTING ARE GAS FUMES NOT EXAUST FUMES AND THERE IS NO CARBON BUILD UP AROUND EXAUST MANIFOLDS. THERE ALSO IS NO EXAUST NOISE COMING FROM ENGINE IN THE FORM OF A LEAK. AS FAR AS THE INTAKE IS CONCERNED, IF THE GASKETS WERE LEAKING WOULDNT THAT GIVE ME A VACCUM LEAK OR A PERFROMANCE DEPLETION. USUALLY THAT CAUSES AN INCREASE IN IDLE SPEED RPM AND A MISS.

    ANY THOUGHTS.

    THANKS,

    CHUCK

  • chucksemon Sep 10, 2009

    HELLO, I DROPPED THE TANK TO CHECK FOR LEAKS. NONE PRESENT ANYWHERE IN THE SYSTEM. I HAVE A SCANNER AND HAVE SCANNED THE CAR. NO CHECK ENGINE LIGHT AND NO CODES STORED IN COMPUTER. I HAVE TESTED AND CHECKED ALL THE OBVIOUS THINGS AND MOST OF THE NOT SO OBVIOUS THINGS AND AM COMING UP EMPTY. I AM OBVIOUSLY MISSING SOMETHING BUT AM DRAWING A BLANK. ANY OTHER SUGGESTIONS?

  • chucksemon Sep 10, 2009

    HELLO,

    ARENT THERE ONE WAY CHECK VALVES GOING TO THE HEATER CONTROLS TO PREVENT FUEL VAPORS FROM BEING SUCKED THROUGH? WHEN YOU SAY. VACUUM CANISTER, ARE YOU TALKING ABOUT THE POWER BOOSTER CANISTER, THE VAPOR CANISTERS (IT HAS 2) OR THE ROUND BALL CANISTER LIKE ON THE OLDER GM'S. IM NOT SURE IF THIS VEHICLE HAS A SECONDARY VACUUM CANISTER. I THINK IT DRAWS VACUUM DIRECTLY OFF THE MANIFOLD INTO A TREE WHICH BRANCHES OFF FROM THERE. I WILL CHECK AGAIN TO SEE I MISSED ONE MAYBE IN THE FENDER WELL. NOTHING IS VISABLE FROM UP TOP. IT IS A 95 GRAND MARQUIS LS WITH TH3 4.6 SOHC WITH THE FIRST GENERATION ALUMINUM INTAKE. I KNOW THE LATE 90'S AND EARLY 2000'S HAD INTAKE PROBLEMS BECAUSE FORD CHANGED THEM TO A PLASTIC UNIT AND THEY LEAK COOLANT. THE AFTERMARKET MADE A PROBLEM SOLVER UNIT WITH ALUMINUM COOLANT RUNNERS.

    ANY OTHER THOUGHTS?

    THANKS,

    CHUCK

  • chucksemon Sep 10, 2009

    HELLO,

    I HAVE NOT HAD ANY RECALLS DONE ON THIS VEHICLE. I DIDNT EVEN KNOW THAT THERE WERE ANY. I GUESS THATS A GOOD PLACE TO START. I AM GOING TO HAVE PULL THE VAPOR CANISTERS OFF AND CHECK THEM. I WAS HOPING THERE WAS A WAY TO CHECK THEM WITH OUT PULLING THEM OFF. THEY ARE IN A BAD SPOT AND ARE TOUGH TO GET AT. WHAT HAS CONFUSED ME ABOUT THIS IS THE FACT THAT I ONLY GET THE FUMES IN THE CAR WHEN I OPEN THE WINDOWS WHEN IM MOVING. IT LEADS ME BELIEVE THAT THE FUMES ARE COMING FROM UNDER THE HOOD AS AIR PASSES THROUGH BUT IF I OPEN THE HOOD WITH THE ENGINE RUNNING I DONT SMELL ANYTHING.

    I APPRECIATE THE INFO YOU GIVEN ME. IF YOU HAVE ANY OTHER THOUGHTS ON THIS, LET ME KNOW.

    THANKS AGAIN,

    CHUCK

  • chucksemon Sep 11, 2009

    HELLO,

    IF THERE IS FUEL IN THE HVAC VACUUM LINES, WOULD THAT AFFECT THE OPERATION OF THE AIR SELECTION CONTROLS? WHAT DO YOU THINK WOULD MOST LIKELY CAUSE CONSTANT FUMES IN THE TRUNK AS WELL. I REALIZE THAT FUMES ARE MORE LIKELY TO GET TRAPT IN THE TRUNK DUE TO LACK OF AIR FLOW BUT DO YOU THINK THE FUMES ARE BEING PASSED IN THROUGH THE INTERIOR OR FROM AN OUTSIDE SOURCE. IM GOING TO TEAR IT APART THIS WEEKEND AND CHECK THE THINGS YOU SUGGESTED. I GUESS THE QUESTION IM ASKING IS WHERE WOULD YOU START. VAPOR CANISTERS, VACUUM CHECK VALVES, VACUUM CANISTER ETC. IF THERE IS FUEL SATURATION IN THE CANISTERS, WHAT WOULD CAUSE THAT AND CAN THEY BE DRAINED AND CLEANED OR DO THEY HAVE TO BE REPLACED?

    THANKS,

    CHUCK

  • chucksemon Sep 11, 2009

    thanks again. i appreciate the help.
    chuck

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If the vapor canister is contaminated or saturated with fuel it will feel heavy when held, 3-5lbs. You could also have a leak at the top of the fuel tank.
Have you had the car scanned for trouble codes? If not, take the car to your local Auto Zone or Advance Auto Parts and ask them to scan the vehicle for trouble codes, they will do it for you at no charge. Write the codes down and we can go from there.
Let me know.
Regards,

Posted on Sep 10, 2009

  • 3 more comments 
  • Bruce Bracey
    Bruce Bracey Sep 10, 2009

    There are instances that do occur where fuel condenses in the vacuum lines to the HVAC control head in the instrument panel. When the engine is started and vacuum is present in the lines, the fuel vaporizes to a gas and then you smell it in the passenger compartment. If that is the case, you can remove the control, disconnect the vacuum head at the control and smell or look for evidence of fuel condensation.

    Also the vacuum tank under the hood may have liquid fuel present in the tank. Remove the tank and see if fuel can be heard sloshing in the tank when shaken.

    Give it a try, let me know.

    Regards,

  • Bruce Bracey
    Bruce Bracey Sep 10, 2009

    I took a look at technical service bullitens and recalls for your vehicle and found the following, have these been done on your vehicle?



    Recall - Fuel Tank Grommet Replacement
    95S12
    04/01/1995



    Recall 95V063000:







    Fuel Filler Pipe Leakage

    NHTSA95V063000
    03/21/1995

    Vacuum diagram for your vehcile:


  • Bruce Bracey
    Bruce Bracey Sep 10, 2009

    Yes, there are check valves, however they only slow the progress of condensed fuel and when these valve get old and begin to leak, the fuel issue can become a problem.

    Have you checked the carbon canister for fuel build up? Make sure the purge valves are working properly.

    Regards,

  • Bruce Bracey
    Bruce Bracey Sep 10, 2009

    Actually air moves from a high pressure area to a low pressure area. When the window is rolled down, the interior of the car becomes a low pressure area, that is why you feel air blowing in through the window. With the windows up, the passenger compartment becomes a "pressure bulb" and will only allow minimal air to enter.

    High pressure builds on the windshield and is pushed in through the cowling area an into the dash vents. Other high pressure areas are under the car, that is why exhaust system outlets are always placed in the rear or side of the car so they are in the low pressure stream and are drawn out and away from the passenger compartment.

    There are air vents located in the trunk area that will allow high pressure air to enter into the trunk (low pressure) if the air valve has malfunctioned.

    Also if the vacuum line to the HVAC control head have fuel in them, the air wafting through the dash vents can pick up the fuel vapor and push it into the passenger compartment. Any seals or grommets in the firewall area will allow high pressure under hood air to enter the passenger compartment.

  • Bruce Bracey
    Bruce Bracey Sep 11, 2009

    To answer your first question, the HVAC control would work with fuel vapor in the line. If in fact they are fuel contaminated, you will want to disconnect the lines and blow them out with compressed air and drain the vacuum reservoir tanks.



    I would start with the recall and the service bulletin, have them done first then move on to the vapor canister, then the HVAC vacuum system if needed. Have the service done and give it a couple of days of driving to clear vapor and fumes before proceeding the the clean out.

    Regards,

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Engine might be having a leaking Intake or exhaust manifold.

Posted on Sep 10, 2009

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