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AWD - Refueling is difficult

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Refueling is difficult V70-XC70 2013

I'm having an intermittent problem with refueling. About a month ago, when I went to gas station, the fuel flow would cut off after about 2 seconds. It took forever to fill the tank even half full. The next two times I went to refuel, it was normal. But yesterday, I experienced the same problem, and also noticed some small fuel drip coming down behind rear wheel (where vent filter is located). Any ideas?





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    Refueling is difficult V70-XC70 2013

    You might want to try a different gas station, just to eliminate the pump as a problem.

    Did you over fill the tank, like after 'normal' automatic shut off and then 'round up' to the nearest dollar or wait to have it shut off again? That can cause gasoline to flow into the charcoal canister and leave no where for the fumes to go.

    As for the 'leak', there have been reported problems with the vent hose becoming detached or cracked at the top of the tank. Keep an eye on that area, it is not an easy repair.
    --
    Keeping it running is better than buying new





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      Refueling is difficult V70-XC70 2013

      I was filling the tank starting from 1/4 full. The shutoff of the pump occurs 2 seconds after fuel flows.
      If I take the filler spout out and start over the same thing happens.

      Could the fuel EVAP vent solenoid be stuck closed? The air in the fuel tank is being displaced by fuel, so there must be a vent path back to the atmosphere. I never really understood how the EVAP could allow venting when the car is fueling, but not when the car is just sitting parked. Does this car know when it's being fueled?

      I guess I'll put a balloon over the vent air filter opening, and observe whether it expands while adding fuel.
      Where can I get documentation of the fuel tank EVAP system, including concept of operation?





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        Refueling is difficult V70-XC70 2013

        https://www.volvopartswebstore.com/showAssembly.aspx?ukey_product=1123949&ukey_assembly=1188587&ukey_make=865&ukey_model=12013&ukey_driveline=505&ukey_trimlevel=0&modelYear=2015

        #13 is the vent hose in use while filling the tank. With the cap off the filler line, fumes will be allowed to escape to the atmosphere. Of course, you are in California where they have the modified nozzles that cover the venting. Try pulling the rubber back to expose the filler nozzle and see if that helps.

        No fumes should be headed toward the charcoal canister during refueling as the system is not under pressure.
        --
        Keeping it running is better than buying new





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          Refueling is difficult V70-XC70 2013

          PROBLEM RESOLUTION:

          On a hunch, I tested the theory that, when stopping to refuel, the engine must BE RUNNING when you press the "fuel pump" button. If the engine is off, and only "ignition ON", the gas flap springs open, but the EVAP Vent is NOT held open at engine shutdown. This frustrates refueling.


          This defect theory was tested and verified. The problem with refueling is:

          1. The EVAP Vent Valve must be open when fueling, to expel tank air as fuel displaces it.
          2. Traditionally, in EVAP system design, the Vent Valve is normally OPEN when the car is off/parked, meaning the car doesn't need to decide when you are parking vs. getting out to refuel.
          3. In this 2013 XC70 (T6 US California emissions model), the EVAP Vent Valve is closed when the car is off & parked, to prevent slow emission of gas fumes through the vent air-filter. The car cannot be refueled in this mode.
          4. The software decides you're stopping to refuel based on pressing the "fuel pump" button while the engine is still running, and leaves the Vent Valve OPEN at engine shutdown.
          5. If you forget to punch the "fuel pump" button before cutting off the engine, but instead come back in and press it with "ignition ON" but no engine running, the valve remains CLOSED and pumping gas is frustrated.

          This might have been better handled in the software design by echoing the "fuel pump" button-press with a console message "Ready to refuel". This message would be only be shown if the Vent Valve were open and the tank ready to receive.





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            Refueling is difficult V70-XC70 2013

            According to the user manual for 2013, the engine can be shut off before opening the fuel door via the switch:

            With the ignition switched off, press and release the button on the lighting panel to unlock the fuel filler door. Please note that the fuel filler door will remain unlocked until the vehicle begins to move forward. An audible click will be heard when the fuel filler door relocks.

            The EVAP is normally in the closed position when the car is turned off, fumes go to the charcoal canister.

            --
            Keeping it running is better than buying new





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              Refueling is difficult V70-XC70 2013

              The manual is describing an older Fuel Flap locking mechanism. On my 2013, the flap springs open when the button is pushed. You have to press the door closed with a click, indicating to me that the solenoid to unlatch the door is momentary.

              As far as the EVAP Vent Valve, quoting from Samarins.com:

              https://www.samarins.com/glossary/vent-valve.html

              "The vent valve is controlled by the engine computer (PCM). Normally the vent valve is open. It closes when the engine computer tests the EVAP system for leaks. If a leak in the EVAP system is detected, the Check Engine light will illuminate on the dash and the trouble code related to the problem will be stored in the engine computer."

              This is referring to a generic design for the EVAP System. My post suggests that Volvo deviated from this generic design.

              As far what happens during refueling, the air in a fuel tank (2 cubic feet, or 30 liters) has to be vented to the atmosphere as the tank is being filled. Fumes are taken up by the charcoal canister, but not volume and pressure. I know from experience with more than one Volvo that the refueling is impeded if there is ANY blockage of the vent path to atmosphere -- these could be a clogged canister, a closed Vent Valve, or a clogged Air Filter. A blocked vent path makes refueling terribly slow and awkward -- only allowing 2 sec bursts of fuel to go in. At least, fuel pumps in the US are sensitive this way, and rely on tank venting to work.





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