there is still a humming comming from the back...what next? do i change the fuel pump now? sometimes when i start my engine i have to pump it like 6 or 7 times for the car to start...am i starving the engine? other then the humming noise i also have to leaky fuel injectors...i bought the injectors but haven't had time to change them...any connection there? please any help will be apprecitated!!!