return pipe-line (in Pink ). When the petrol tank (in the car)
reaches full level, there is a mechanism to trigger off the pump
latch and at the same time a return-valve is opened (at the top
of the pump station) to allow excess petrol to flow back into the
sump. But the return petrol has already pass through the meter,
meaning you are donating the petrol back to
ADNOC/ENOC/EMARAT/ BAPCO
