Turbo - No Fuel Flow

Zacke

The EDM shows the fuel flow while priming. Even when the ff gauge doesn't.

StefanL85

I am having the same issue. No fuel flow indicated at priming and to get the needle moving on ground after startup I have to open the throttle around one quarter. Ambient Temperture is the heat in Europe and I hammered the glass like a crazy person.

Voxen

This video at 8:45 also demonstrates this quite clearly:
https://youtu.be/YcCze1mSZ8c?si=hfq2mLXyCGIjfd-R

Black Square

@Zacke said in Turbo - No Fuel Flow:

The EDM shows the fuel flow while priming

Can someone read what the fuel flow is while priming, or what the value of L:BKSQ_FuelFlow_1, GALLONS PER HOUR is?

Voxen

In SPAD.Next data inspection, BKSQ_FuelFlow_1 is not updated at all (value is always 0 and never changes), while priming or when engine is started and pushed up to 20mp.

GALLONS PER HOUR, I don't find this variable at all.

Also I noted that once engine is running, the FF needle only start to move around 18mp, not below.

Zacke

6,5 gph on the EDM while priming.

Jonas.MV

This might be helpful for troubleshooting: in the stream of pilotdeviation, there was also no fuel flow in the non-turbo version: time index 00:34:40 https://www.twitch.tv/videos/2837089058

MatzeH84

FWIW I see fuel flow on the TN. But the needle is indeed quite sticky.

Ratman

I did another test and found something interesting.
This time, the fuel flow indication didn't increase again, even after tapping the gauge. The EDM showed that fuel flow was increasing normally, so the engine itself was receiving fuel correctly.
Since I had previously completed a flight where the gauge worked as expected, I tried to figure out what was causing the needle to stick. It seems to start sticking at around 16°C. By 20°C, the needle no longer moves upward at all, even if I tap on the gauge.

Voxen

What is strange is that I’m 100% sure to have seen the needle moving as expected at least once, most likely on the very first flight after purchase where I carefully followed the entire checklist.

Black Square

Hi, everyone. I looked into this more today, and found the obvious: The fuel flow gauge is highly non-linear at the very bottom of its scale. Since these real instruments are full of real mechanical eccentricities, I've just added a little piece of "cheater" code to help boost the fuel flow indication just enough to read on the scale. Hopefully that should help eliminate any confusion.