Post by Markoz on Mar 19th, 2011 at 8:22am
Hi All.
I've been doing some experiments with the fuel. What I found is interesting, to say the least.
For the following explanation to work as I say, you need to have the Fuel Valve Switches ON/OPEN as in the image I have included below. The numbers correspond to the numbers near the Fuel Valve that I'm referring to. I have also written the numbers in yellow on the switches (the yellows numbers are the same as the white ones on the panel texture).
CENTER - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 25
CENTER 2 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 26
CENTER 3 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 27, 28
LEFT - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
RIGHT - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
LEFT AUX - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
RIGHT AUX - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
LEFT TIP - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 23
RIGHT TIP - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 18
EXTERNAL 1 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 17
EXTERNAL 2 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 24
Don't worry, it gets stranger.
All the engines can be started or WILL run, even with ALL the Fuel Valve Switches CLOSED/OFF, providing the Main Tank Boost Pump Switches (the four switches under the red covers)are ON AND you have fuel in the Left Aux, Right Aux, Left Main and Right Main tanks. Once the fuel tank providing fuel DIRECTLY to the engines using those Main Tank Boost Pumps is empty, the engines will shut down. This means:
LEFT AUX directly feeds fuel to 1 & 2
LEFT directly feeds fuel to 3 & 4
RIGHT directly feeds fuel to 5 & 6
RIGHT AUX directly feeds fuel to 7 & 8
So basically, if those tanks have fuel and the Main Tank Boost Pump Switches are ON (they aren't OFF in the Cold-n-Dark saved flight), you should be able to get your engines started.
I don't think I have covered it all. There is more there involving Fuel Valve Switches that I have not covered at all. It really is bl**dy complicated. I have no problems setting up the fuel to feed all engines with one fuel tank that I choose to feed from. I just messed around to see what does what and sorted most of it in my head.
Hope this helps.
Mark
I've been doing some experiments with the fuel. What I found is interesting, to say the least.
For the following explanation to work as I say, you need to have the Fuel Valve Switches ON/OPEN as in the image I have included below. The numbers correspond to the numbers near the Fuel Valve that I'm referring to. I have also written the numbers in yellow on the switches (the yellows numbers are the same as the white ones on the panel texture).
CENTER - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 25
CENTER 2 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 26
CENTER 3 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 27, 28
LEFT - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
RIGHT - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
LEFT AUX - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
RIGHT AUX - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 19, 20, 21, 22
LEFT TIP - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 23
RIGHT TIP - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 18
EXTERNAL 1 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 17
EXTERNAL 2 - feeds fuel to the engines if either of ANY of the following fuel valves are OPEN/ON - 24
Don't worry, it gets stranger.
All the engines can be started or WILL run, even with ALL the Fuel Valve Switches CLOSED/OFF, providing the Main Tank Boost Pump Switches (the four switches under the red covers)are ON AND you have fuel in the Left Aux, Right Aux, Left Main and Right Main tanks. Once the fuel tank providing fuel DIRECTLY to the engines using those Main Tank Boost Pumps is empty, the engines will shut down. This means:
LEFT AUX directly feeds fuel to 1 & 2
LEFT directly feeds fuel to 3 & 4
RIGHT directly feeds fuel to 5 & 6
RIGHT AUX directly feeds fuel to 7 & 8
So basically, if those tanks have fuel and the Main Tank Boost Pump Switches are ON (they aren't OFF in the Cold-n-Dark saved flight), you should be able to get your engines started.
I don't think I have covered it all. There is more there involving Fuel Valve Switches that I have not covered at all. It really is bl**dy complicated. I have no problems setting up the fuel to feed all engines with one fuel tank that I choose to feed from. I just messed around to see what does what and sorted most of it in my head.
Hope this helps.
Mark