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Wondering how much fuel evaporates when a vehicle is parked in the sun

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  • Wondering how much fuel evaporates when a vehicle is parked in the sun

    Hi,

    I was wondering if there's anyone who's experimented or researched the amount of fuel that evaporates when the vehicle is parked in the sun.

    I purchased a Hero Maestro towards the end of december 18 and have been testing it's mileage since. I have completed 1000 KMs and my previous mileage was 29KMPL, which I feel is quite low even after considering the run-in period and newness of the engine. I use the full tank to full tank method.

    Ever since summer has kicked in, I've noticed a further decline in mileage. From 29, it dropped to 20.

    My building compound does not have a shed and I am forced to park the scooter in an open area. Moreover, I work full time and get to use the vehicle only on the weekends. This means the scooter stays unused and parked in the sun through five whole afternoons every week. I use a black parking cover, however the bike heats up considerably under it.

    Given the petrol evaporates under the sun and I am using the full tank to full tank method, I was wondering if the evaporation could be offsetting the mileage.

    So far I only know that petrol evaporates when the vehicle is parked in the sun. However,

    1. I do not know how much evaporates over say one whole afternoon in India or over 5 working days.
    2. I heard some newer vehicles have a system in place than captures the fumes and redirects it back into the engine. However, I do not know if Maestro has such a feature, found no mention of it anywhere.

  • #2
    Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

    Thread approved.

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    • #3
      Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

      Originally posted by xBhp View Post
      Thread approved.
      There are different types of fuel tanks and different materials also , on scooter the tank rest below the seat, also its insulated from direct sunlight unlike a unicorn whose tank is metal and sits atop the frame in direct sunlight. some tanks are made of plastic so that also help in restricting evaporation.

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      • #4
        Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

        I have noticed petrol evaporates and reducing 100ml in 3 days when parked in shed. This is in Honda unicorn and I am pretty sure of the accuracy because I tested the evaporation on empty tank and by filling 1 liter and emptied after 3 days by physically taking the tank from the bike.

        Newer bs4 bikes have mechanism to prevent too much of evaporation to open air.

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        • #5
          Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

          I recently installed a bosch fuel filter, cost just 30 rupees, in the fuel line, whenever i park for more than a day i usually turn off my fuel supply, even then i have barely noticed any loss of fuel, one reason would be that i use a tank cover which may be shielding the tank from the sun. so even after a day when i check the filter i can see fuel inside it its made of plastic and semi transparent, .

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          • #6
            Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

            Originally posted by [email protected] View Post
            I recently installed a bosch fuel filter, cost just 30 rupees, in the fuel line, whenever i park for more than a day i usually turn off my fuel supply, even then i have barely noticed any loss of fuel, one reason would be that i use a tank cover which may be shielding the tank from the sun. so even after a day when i check the filter i can see fuel inside it its made of plastic and semi transparent, .
            Hi, could you pplease share the pic of the fuel filter. I woul also go for this type of filter for all my bikes and scooters.
            Thanks

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            • #7
              Re: Wondering how much fuel evaporates when a vehicle is parked in the sun

              Originally posted by srikany View Post
              Hi, could you pplease share the pic of the fuel filter. I woul also go for this type of filter for all my bikes and scooters.
              Thanks
              Sorry for late reply, i forgot where this post was, the original ones are from mico brand ,costed 30 rs or so but unavailable now, replaced by cheap chinese ones that cost just 10 rs, install the proper way with the direction of fuel flow.
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