Turbo - No Fuel Flow

tttocs

I'm thinking this may be temperature related. As I noted earlier, I'd seen the fuel flow gauge begin to respond with longer priming times on the TC. However on my last few flights it has never moved. The difference is the last few flights have been from airports with extremely high (>30c) temps.

However, even with the hot temps, the engine still starts just as expected with no issues.

Voxen

Ok here is another, I think I didnt miss anything this time
https://share.icloud.com/photos/0cbjo-607vAVAumHSAN5Uezyw

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.

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.