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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
To have oil to the injector and no air but no oil out of the injector indicates injector is either not working or no oil pressure to force to/through the injector. The click sounds like it sound be activating the injector and you would want to check there is nothing preventing flow as well as checking oil is being fed to the injector correctly.
Thank you!- Joe
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