reported Fuel Supply

[Mike Busutil]

It appears fuel is only being drawn from the main center tanks while the Aux tanks remain at the same fuel levels of ~780 lbs. and are not feeding the main tanks or engines.

After the main center fuel tanks reach 0 lbs. the engines will fail a few seconds later and a loss of control will occur.

Note engines are failing with approximately 3,100 lbs. of total fuel remaining onboard.

I have verified this with the Aux fuel pumps On and cross feed switch open.

Is this a bug or am I doing something wrong?

Edited August 11, 2024 by Mike Busutil

[47_Driver]

2 hours ago, Mike Busutil said:

It appears fuel is only being drawn from the main center tanks while the Aux tanks remain at the same fuel levels of ~780 lbs. and are not feeding the main tanks or engines.

After the main center fuel tanks reach 0 lbs. the engines will fail a few seconds later and a loss of control will occur.

Note engines are failing with approximately 3,100 lbs. of total fuel remaining onboard.

I have verified this with the Aux fuel pumps On and cross feed switches open.

Is this a bug or am I doing something wrong?

Close the crossfeed for normal operation. I'll have a look at this today, but I've not noticed any issues so far.

[Mike Busutil]

1 hour ago, Brickle said:

Close the crossfeed for normal operation. I'll have a look at this today, but I've not noticed any issues so far.

I did have the cross feed closed for the flight but opened it after I noticed the Aux fuel levels were not changing late into the flight and the main tanks were getting lower. 

I assumed since the Aux pumps were already on, they should be supplying fuel to the main tanks but this did not work. 

[47_Driver]

1 hour ago, Mike Busutil said:

I did have the cross feed closed for the flight but opened it after I noticed the Aux fuel levels were not changing late into the flight and the main tanks were getting lower. 

I assumed since the Aux pumps were already on, they should be supplying fuel to the main tanks but this did not work. 

You are correct, that's how they should function. I'll mess with this later and see if I can replicate on my end.

[cw4ogden]

Crossfeed stays closed during normal operations to prevent the possibility of a dual engine flame-out.  If you suck one side dry, having the X-feed open will flame out both engines.  The best analogy is having two straws one in your glass, one inside your drink, the other outside of it.  If you suck on both straws, you're only going to get air.  Given the choice, with the crossfeed open, both engines will draw from the empty tank akin to the straw sucking air.

As depicted in your photos it appears to be a bug.  Aux's feed the main tanks keeping them topped off until Aux tanks are empty.  Will test here as well.  

Keeping the crossfeed closed, fuel starvation can only kill the affected side's engine.

[Mike Busutil]

1 hour ago, cw4ogden said:

Crossfeed stays closed during normal operations to prevent the possibility of a dual engine flame-out.  If you suck one side dry, having the X-feed open will flame out both engines.  The best analogy is having two straws one in your glass, one inside your drink, the other outside of it.  If you suck on both straws, you're only going to get air.  Given the choice, with the crossfeed open, both engines will draw from the empty tank akin to the straw sucking air.

As depicted in your photos it appears to be a bug.  Aux's feed the main tanks keeping them topped off until Aux tanks are empty.  Will test here as well.  

Keeping the crossfeed closed, fuel starvation can only kill the affected side's engine.

As mentioned above, I did have the cross feed closed for the flight but opened it after I noticed the Aux fuel levels were not changing late into the flight and the main tanks were getting low. Also note the right main center fuel level is only 1 lb off from the left main center fuel tank. 

I took the screenshot of engine #1 failure right after reaching 0 lbs in the left main fuel tank. Engine #2 failed a few seconds afterwards when the right main center tank reached 0 lbs.

[cw4ogden]

6 minutes ago, Mike Busutil said:

As mentioned above, I did have the cross feed closed... 

Yes, can confirm AUX tanks do not transfer fuel for me either.

[Hawkeye91]

@BIGNEWY I’m having this problem too. BN, can we get this topic moved to bug reports to be tracked? It’s definitely a bug.  

[BIGNEWY]

Hi, 

we will take a look 

thank you 

[BIGNEWY]

reproduced and reported 

thank you