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· Series Moderator
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The injector pump detects the turbo pressure so it can alter the fuel ratio as the air pressure from the turbo increases,it does this by means of a small pipe that runs from the turbo to the injector pump.It is possible that the turbo is pressurising the fuel and also causing air to be forced into the pump but I wouldnt expect the fuel tank to pressurise in the way you say as the breather should eliminate the pressure.

Are you 100% the breather is ok and clear if so try running without the fuel cap on to see if the symptoms of poor running and low power still occur.

Cheers ONz
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