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I have 5 month old Royal Enfield 350cc with only 4600 km. My bike stopped in the middle of the highway ... fuel was leaking ... I went to the service center they told me there is an issues with fuel tank ... it's leaking ... I got the fuel tank changed ... now I am facing air pressure issue with my new fuel tank ... I again visited the service center ... they checked the vacuum line & changed the valve ... but still I am facing the issue ... my bike gets stopped again and there is air pressure in my fuel tank ... please suggest what to do ... I have visited the service center many times but issue is still reproducible.

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  • Welcome to Motor Vehicle Maintenance & Repair! Jul 22, 2019 at 10:36
  • "Pressure" - as in negative pressure (vacuum)? Bad ventilation perhaps? Are you taking to a manufacturer's dealer or a private shop? Sounds like your shop is guessing.
    – mike65535
    Jul 22, 2019 at 12:36
  • Thanks for the reply...I am going to the dealer from where I have purchased the bike....but they are unable to detect the issue....I am still confused what to do...as it's a only 5 month old...bike... Jul 22, 2019 at 15:04

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The combination of "leaking fuel" and finding pressure or vacuum in the fuel tank indicates that something is awry in the fuel delivery system (petcock, fuel line, carburetor, fuel tank) and/or in whatever system the bike uses to manage venting from the fuel tank (fuel cap, gasket, included vacuum port or valve, connecting vacuum hoses, something else).

Both of the symptoms you report are abnormal, and neither should occur. I don't know how these systems are designed on this model bike, however, so I can't give you specific troubleshooting ideas. You must find a competent mechanic to examine the machine, and find and rectify the faults.

If the bike is still under warranty, return it to the dealer.

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