Hello mates, first of all good morning:), secondly I would like to know why dont the engines switch off when i cut the pumps from the over head panel? Is that what happens in a real 737. One reason i didn't, enjoy flying the DF 737 was of this issue that when i turn the pump switches off the enignes keep on producing thrust. Is this normal on a real 737? I have several packages on my shelve, and they all seem to have it that when i switch the pump off the engines will turn off, i think its logical no? Well thank you in advance:)LukeThe right flyer!!

Hi Luke!!! 10 minutes to 11 in the evening here south of Boston, Good Evening!!!!!I am sure I will be corrected if this is inaccurate.737s in general I believe, have similar fuel systems, I have manuals for the 300, 400 and 500 which I believe also describe the 600 and 700 fuel systems. Your question is really a good one.The 737 has three tanks, left, center and right, each with a two pumps. There is a fuel manifold which is split into left and right ... left fed from the left center pump and the two left pumps, and similar with the right .. the cross feed joins the two manifolds into one fuel manifold in the event that pumps on either side should fail.BUT .. and the TRICK with the 737 is that both engines have ENGINE DRIVEN FUEL PUMPS which will draw fuel even without a pressurized fuel manifold. Pretty neat huh?The APU also has it's own fuel pump in the event that the left rear main tank pump should fail.I hope this solves some of the mystery.

Luke,Paul is correct on this one. The electric fuel (boost) pumps generally are used for backup in case of a fuel pressure drop, among other functions like pressure for engine starts since the engine driven pumps are connected to the engine gear box which are not running yet. Airliners basically have several different kinds of fuel pumps:*Electric pumps-which you can control via the overhead panel...you can arm/disarm these all day long without depriving the engine of fuel.*Engine Driven pumps-which operate when the engine is operating*Also Motive Flow pumps (which operate from differential pressure)- which are basically a venturi pump.BTW...here is something interesting. If your Engine Driven Fuel Pump fails, the engine will flame out regardless of the electric fuel pump switch position. That is the way it works in the aircraft I fly. Good thing the EDP's are very reliable. I personally haven't seen one fail yet :)Best Regards,Randy

Hey thanks a million guys;) bdw i am from Malta in Europe :)Any one knows if the screen wipers work or not cause mine sure dont ;). Thanks once again guys. Mostly appreciatedLukethe right flyer!

"The APU also has it's own fuel pump in the event that the left rear main tank pump should fail."I read (in the Boeing Maintenance Manual) that the APU can be fed fuel by any pump in any tank. Does anyone know why this particular pump is used?Thanks.Cheers.Ian.

As I interpret it the APU fuel pump is an option. So some does have it and some don't...lolReagrds