I'm sorry if this has been posted already in the forum, I tried the search function but could not find anything.When flying the Project Opensky Boeing 737NG and running out of fuel, a message box appears that I should refuel or switch tanks. I notice that the right and left tanks are fuel but don't know how to switch to them. Any help appreciated.Thanks!

I don't know how accurate the NG you have is, or what model it is, and the process differs depending on the model of NG, so there are a couple of different procedures.If it is a BBJ, 700, or a 900ER, it will have auxiliary tanks. These are usually the same in number, although the BBJ can have up to twelve auxiliary tanks fitted if a customer requests it. The only other exception is the US Navy Poseidon MMA/P-8A, which is a hybrid of the 900 and 800 NG and can have more tanks too.To transfer fuel on the real NG's auxiliary tanks, there is an auxiliary transfer system which can be found above the electrical busbar panel on the overhead (although it looks a bit different in the Navy P-8). There are four switches, with Off and Auto Forward/Auto Aft being the positions you can select. These switches transfer fuel to the centre tank from the auxiliary tanks, you can use these to maintain or alter CoG by shunting fuel about, but it is normal practice to leave them on and automatically transfer fuel.The switches do not actually pump fuel on the real NG, instead what they do is open a valve and overspill pressure from the cabin presurisation system, and the engine bleed air maintains a higher pressure in the auxiliary tanks, which causes them to transfer their contents to the centre tank when the transfer valves are opened with those four switches. On 737 NGs other than the BBJ, 700 and 900ER (i.e the 600, 900 and 800), there are three fuel tanks as standard and no auxiliaries. For these variants, you use the standard Fuel Panel found in all 737s on the left front part of the overhead, which controls the fuel pumps and the crossfeed valve. Normally you can just switch everything on that is on this panel and it will do the job, although you might want to leave the crossfeed switch alone.On the 737 NG, the centre and wing tanks feed the engines, but the centre tank contents are used up first because the pump in the centre tank maintains a higher pressure than that of the wing tanks. You should be aiming to land with about 4,000lbs of fuel left.Hope that helps, and also hopes it stops you posting the same question repeatedly.Al