Parking on a inclined plane is not a problem. Pointing up or down doesnt make much difference if it is for a shorter period & night long. But if you are parking for a long period (weeks together) it is safe to park pointing down. Reason - Compared to other fluids petrol has much more storage losses (Storage losses - A certain amount of petrol is lost even though it is only stored).
Technical part - There is a fuel pipe from petrol tank to engine. There is always (only when car is in ON state) a pump which pushes the fuel from tank to engine through this pipe. This pump will not be working when the vehicle is parked. So the fuel is filled inside the pipe only due to gravity. When the car is parked pointing downwards, the fuel pipe (engine side) will be always filled with fuel, though you park for a long time. So there will not be any air-gap or vacuum created inside the pipe on the engine side. If car is parked pointing up, the fuel pipe (tank side) will be always filled and as the petrol evaporate there will be air-gap or vacuum created inside the pipe on the engine side.
Summary----Chance of air-gap or vacuum is always on the upper side due to gravity.Pointing up - engine at upper level - tank at lower level - chance of air-gap or vacuum inside the petrol pipe will be on the engine side - UNSAFEPointing Down - engine at lower level - tank at higher level - chance of air-gap or vacuum inside petrol pipe will be on tank side - SAFEParking for a short period or full night is not a problem and for a long time (weeks together) follow above direction.
B. HAND BREAK
Best procedure for using hand break.As the vehicle stops - 1) Bring the vehicle to neutral gear and release clutch. 2) Pull hand-break ON 3) Press clutch pedal and change to first gear 3) Turn off the engine.
By following this procedure we can park the vehicle with absolutly zero load on clutch.load on clutch will come to effect when parked on ground-slope at any of the wheel. To avoid this undesired load on clutch we will have to follow the above procedure. Load on clutch even for a short period is harmful and may lead to gear changing problem.
About the technical points explained above even the technical person in the service centers was not aware when I discussed with them, and he accepted and he was very happy. But if you find a very senior person (age = 55+) in any of the service center with sound technical knowledge/experience they will be knowing these points.
Wish you all SAFE DRIVING and also SAFE MAINTANANCE
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