Fuel dump is a system seldom used, as the fuel dispursed can cause poisoning of the land, fire hazards and other things. You should calculate your fuel needed with an alternate, and fuel dump should be reserved for emergencies.

There are a few things to remember with the fuel and the 707. To follow what I mean, open the ‘707 Captain’ FLIGHT MANUAL Part II – Aircraft and Systems (cs707_manual2.pdf) and go to page 88.

They are:
1. Make sure that all the Manifold Valve Switches (42-45) and Transfer Valve Switches (46,47) are OPEN/ON!
2. Keep a close eye on the fuel tanks and when they are almost empty (about 100 - 1000 pounds of fuel remaining), turn the Fuel Boost Pump Switch (16,17,18,19,24,25,26,27,28,29) for that fuel tank OFF. The exception to this is the Fuel Quantity Gauge for the Reserve Tanks (Left & Right Tip tanks) as they do not have a Fuel Boost Pump Switch.

By doing that, you should not have any problems.

Mark

First of all, we have to differentiate the questions and complains a bit. The B-52 is the Fun line thing, but these are the 707 forums. If one would constantly struggle with the Fuel on the B-52, I would recommend going with "unlimited fuel", set up in the FSX realism dialog.

When we're talking about the 707, we are talking about the detailed systems there, since this is not a "Fun" product, therefore some reading of the manuals and understanding can be assumed to have taken place. Since these are the forums, questions are always welcome and you'll find people like Mark explaining them as good and as often as they can. Thumbsup there.

The 707 runs seven tanks, Center, Left/Right Main (=2&3), Left/Right (=1&4) and Left/Right Tip (="Reserve"). Fill them up with the outer tanks first and empty them from the inner ones then, regarding the special role of the "Reserve" ones.



A more detailed description is included in the manuals, giving you the switch and valve setting.



So if you look up your current fuel distribution in the "IF" column, you will see how to set up those valves and switches and also, you can read what to do next when some fuel has been used.
The very last "IF" item is Main tanks 2&3 equal tanks 1&4 + their Reserve, so this will be the last point were you can (and should) set up the fuel distribution on the plane.
Running all four engines at the same setting, this will give you all four tanks (1,2,3,4) going to "0" at the very same time. I don't know if the real plane flew like this, but I can tell that the manuals for the CS state it and it works just fine there.
If you look in that diagram, your flight should have ended before this "0" point. Otherwise, it will be ended then.  

Fuel dumping is more or less an emergency procedure but, as this is a sim, you can simulate it every time you want to of course. This thing also requires some management and it will mainly be the same as if you would burn the fuel at a very fast rate.
Only Mark drops his fuel all at once.   (still laughing, Mate, don't get me wrong though. By the way, isn't their a Lake named after you then?)

Since this Boeing only can crossfeed and not crosstransfer, the only thing to prevent you from running dry is to set the valves in the right way. But, as you see, all four tanks are supposed to run down at the same rate on the later part of the flight, so they all "feed" your engines and they all should have the same amount of fuel when enabled this way of feeding.


Your description doesn't reflect this setup (which comes from the manuals). So you may want to improve the setup there to eventually enjoy the 707.  
Quote:

So, currently, you are missing the step when Main tanks 2&3 equal tanks 1&4 + their Reserve. Look it up in the diagram and fly safe(r).

I don't recommend fuel dumping. It always dumps fuel from one tank before another, which can leave your aircraft way off balance. Fuel is dumped this way:

1st - Left Tip - Reserve (2941.3 pounds)
2nd - Right Tip - Reserve (2941.3 pounds)
3rd - Left Aux - No 1 Tank (15564.1 pounds)
4th - Right Aux - No 4 Tank (15564.1 pounds)
5th - Left - No 2 Tank (27262.3 pounds)
6th - Right - No 3 Tank (27262.3 pounds)
7th - Center - Center Tank (68293.1 pounds)

You can imagine that once you have dumped the fuel in the Left Tank, the balance will be out by 27262.3 pounds (if they both had 100% of fuel) and it will lean to the right. I wish you could control the fuel dumping a bit better than that.

@crashbar - If I follow the instructions, which I gave you in my previous reply, all my engines continue to run.
I just finished doing a test and I deliberately ran out of fuel (I was on the ground at the time). I had the Center, Left and Right fuel tank pumps switched OFF and fuel was still being fed to all the engines, except for the Center fuel tank, which remained the same UNTIL all the fuel from ALL the other tanks had been consumed. I don't recall the fuel tanks/pumps behaving this way in v1.2.

Mark

You are right on the fuel dumping, Mark, only one side is fully drained, regardless of the settings on the fuel dump panel.
A thing to fix, huh?
I've put it on the list.  

Crashbar, I've mixed up the numbers of the tanks in this line. See the correct ones here and also above (I've edited the post).
The 707 runs seven tanks, Center, Left/Right Main (=2&3), Left/Right (=1&4) and Left/Right Tip (="Reserve").

I would like to see fuel dumped evenly, like the Left and Right tanks at the same time, so that the aircraft balance remains.
Absolutely, Mark. I'm with you there and I've added the item to the list.

While I understand your need for a working fuel dump procedure, I wonder why somebody would use the "manual" addition or reduction of the aircraft's fuel via the FSX menus inflight on a regular basis.
Of course, the fuel should be set before engine start and it should fit your route, some holding and those three go-arounds I always need.  
Isn't that fuel planning (roughly will do!) a part of the fun when using a detailed aircraft?

The documents help you guys and, if not, the fuel flow gauges will do since you gain some experience about the actual fuel burn rate there. The 707 even records the fuel used for each engine, so you can do your normal roughly planned flight and see what was used and how close to "dry" you were.
Am I the only one wondering?  

Sounds good, Mark. If I were a passenger in the sim, I'd go for one of your flights (at least the ones where you don't dump fuel).  

But, maybe we all agree that a fuel planning app built into the ACE would be neat. Does anyone support this idea?  

CoolIP you do realize this is just a game and right?  So if I fuel dump you do realize that fuel wont actually dump on people's head right?  Cool we have that straight.  Mark you ask why I "would use the "manual" addition or reduction of the aircraft's fuel via the FSX menus in-flight on a regular basis".  Mark, have you ever gone out in a military plane and lets say.....did a 12 hour patrol flight over Afhganistan?  Mabie you dropped all your bombs and your headed home and your a little fuel heavy and your add-on plane doesn't have a in vc fuel-dump feature.  Guess what, that's when I use it.  I don't ALWAYS use it but sometimes when needed I do.  Look, what we are talking about here is simple, being able to takeoff or land with the fuel amount you select without the engines dying or all of your planes avionics turning off.  Either by using fuel-dump or by figureing out exactly how much fuel will be needed which I admit I'm not good at.  So this plane and the B-52 are either fly them witht the complicated(although realistic) fuel systems or switch on "unlimeted fuel" option(please you must be joking lol).  There is no in between.  I mean isn't there 3-4 other pilot's with different jobs that help manage things like fuel.  I mean for example:  I'm doing a bombing run in the B-52 after a 3-4 hour flight and as I desend to 5,000ft. and level out, bomb bay doors open, drop bombs lift up and turn and OH CRAP!!, I forgot to turn off the Fuel Valve for tank 3 and now I'm a falling brick. All I'm asking is to at least give these planes an option to be more fuel forgiving like the C-130 instead of making me do the job of 3-4.  I want to fly, not be a fuel management officer.

CoolP,

Fuel dumping in the real world was not without risk. It was an emergency procedure.
There is another way to get rid of some fuel it you're too heavy for landing.
We would deploy the spoilers and/or even drop the gear to increase fuel burn. 

Lou

CoolP, I used to clean my own windows too. No big deal!
Could not clean the 747 window. 

As for the baggage bin, I saw just this thing happen at KMIA. We were taxing out for takeoff and there was a DC-10 cargo plane off to our left in the cargo area taxing in to park. I guess he gave it a bit too much power as he neared the parking spot, or maybe the bins were too close. In any event he sucked the tarp off the bag cart into the #1 engine. The whole plane jumped as the engine stopped right now.

Are we not on topic?    Fuel is still involved in some way.

lucatrader,

Read the manual! Page 36 of the ops manual part III spells it all out.

After you look at the manual, if you still need help, one of us will try to help.  

Lou