PAC 750XL : Fuel Capacity is wrong!

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Are you using Developer Mode or made changes in it?

No

Have you disabled/removed all your mods and addons?

Yes

Brief description of the issue:

The fuel capacity is wrong : see your own documentation !

Provide Screenshot(s)/video(s) of the issue encountered:

Detailed steps to reproduce the issue encountered:

PC specs and/or peripheral set up if relevant:

Build Version # when you first started experiencing this issue:

1.31.19.0


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Do you have the same issue if you follow the OP’s steps to reproduce it?

Provide extra information to complete the original description of the issue:

If relevant, provide additional screenshots/video:

Since this is a purchased plane (isn’t it?) why raise a bug report on MSFS? Shouldn’t you be contacting the developer which I think is Orbx

2 Likes

I am in the process of preparing an email, after all the Caribou does have flight physics bugs.

contact support

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I was just having a look at this. The docs in the Community version report this:

image

But the config has this:

Tank.1=Name:TANK_REAR_LEFT#Title:Rear Left Tank#Capacity:121.9#UnusableCapacity:4#Priority:0#Position:-11.59,-7.0,0.9
Tank.2=Name:TANK_REAR_RIGHT#Title:Rear Right Tank#Capacity:121.9#UnusableCapacity:8#Priority:0#Position:-11.59,7.0,0.9
Tank.3=Name:TANK_FRONT_LEFT#Title:Front Left Tank#Capacity:41.6#UnusableCapacity:1#Priority:1#Position:-9.18,-7.0,-0.9
Tank.4=Name:TANK_FRONT_RIGHT#Title:Front Right Tank#Capacity:48.4#UnusableCapacity:0#Priority:1#Position:-9.18,7.0,-0.9
; COLLECTOR TANK
Tank.5=Name:TANK_COLLECTOR#Title:Collector Tank#Capacity:6.8#UnusableCapacity:0#Priority:2#Position:-9.18,-7.0,-0.9

They do have the Collector tank correct though:

image

They also got the unsusable quantity wrong.

So surely this should read:

Tank.1=Name:TANK_REAR_LEFT#Title:Rear Left Tank#Capacity:37.5#UnusableCapacity:0#Priority:0#Position:-11.59,-7.0,0.9
Tank.2=Name:TANK_REAR_RIGHT#Title:Rear Right Tank#Capacity:37.5#UnusableCapacity:0#Priority:0#Position:-11.59,7.0,0.9
Tank.3=Name:TANK_FRONT_LEFT#Title:Front Left Tank#Capacity:75#UnusableCapacity:3#Priority:1#Position:-9.18,-7.0,-0.9
Tank.4=Name:TANK_FRONT_RIGHT#Title:Front Right Tank#Capacity:77#UnusableCapacity:3#Priority:1#Position:-9.18,7.0,-0.9
; COLLECTOR TANK
Tank.5=Name:TANK_COLLECTOR#Title:Collector Tank#Capacity:6.8#UnusableCapacity:0#Priority:2#Position:-9.18,-7.0,-0.9

With that config in place it now looks like this:

Just tested reserve fuel as well, as that appears to work. With three gallons left, it switched to the Collector tank only, which is now dropping:

There was this weird limbo state for about 10 seconds where no fuel was being drawn from anywhere but the engine continued to run. Then the Collector started draining.

As expected, this was the end result, but for some reason it took about ~38 seconds for the engine to quit:

Does the sim model fuel in fuel lines as well? Or perhaps another bug.

Well, apparently it does. If not defined in the config, and they aren’t, each fuel line has 0.24 gallons in it. So for the collector that would be these two:

; COLLECTOR => AUX PUMP
Line.5=Name:L_AUX_PUMP_IN#Title:CollectorToAuxPump#Source:TANK_COLLECTOR#Destination:P_AUX
; COLLECTOR => FUEL COCK
Line.6=Name:L_AUX_PUMP_OUT#Title:AuxPumpToFuelCock#Source:P_AUX#Destination:V_FUELCOCK

So there was at least an additional 0.24 gallons of fuel to burn, which might explain those ~38 seconds where the engine kept running.

2 Likes

It seems they have modelled the fuel capacity from aircraft 186 onwards, whilst providing a POH for the earlier aircraft.
Look at the Type certificate https://www.easa.europa.eu/en/downloads/7362/en
and it lists both configs, the CFG file is close enough to the current config.
The feeder tank SHOULD be in the front left tank rather than separate, maybe MSFS doesn’t allow that.