Flightist
Well-known member
- Joined
- Jan 1, 2002
- Posts
- 11,168
Hi People,
I'm flying a '71 206 that has had some interesting problems, apparently fuel system related.
On several occassions the engine suffered from very low power on the takeoff roll. You could taxi back and run up the engine again and power would be fine. Another pilot flying the plane and having the same power loss was able to restore power in flight by pulling the throttle to idle and then back full. In other words, an intermittent power loss. Our A & P, after talking to some other people, replaced the fuel pump.
After the pump replacement, fuel pressure was quite high. The pressure was reduced downward to the recommended 6-7 psi. Despite the pressure adjustment, the mixture control has to be leaned way more than normal to get fuel flow correct (about 2" out at sea level). I've had no more of the major power losses but the fuel flow is still way too high.
The plane has a digital fuel flow gauge to back up the steam gauge. And it has an EGT. I've run the plane just fine by setting the mixture with the fuel flow gauge and EGT but obviously this thing needs some further work. The idle mixture has been set so we're getting the recommended 50 rpm rise with the mixture idle cut-off.
Can anyone tell me what's happening here? Where can further adjustments be made? Could it be the mechanics pressure gauges are wrong and there is still too much fuel pressure. Something else in the system that's screwing things up? Any insights into this would be much appreciated.
I'm flying a '71 206 that has had some interesting problems, apparently fuel system related.
On several occassions the engine suffered from very low power on the takeoff roll. You could taxi back and run up the engine again and power would be fine. Another pilot flying the plane and having the same power loss was able to restore power in flight by pulling the throttle to idle and then back full. In other words, an intermittent power loss. Our A & P, after talking to some other people, replaced the fuel pump.
After the pump replacement, fuel pressure was quite high. The pressure was reduced downward to the recommended 6-7 psi. Despite the pressure adjustment, the mixture control has to be leaned way more than normal to get fuel flow correct (about 2" out at sea level). I've had no more of the major power losses but the fuel flow is still way too high.
The plane has a digital fuel flow gauge to back up the steam gauge. And it has an EGT. I've run the plane just fine by setting the mixture with the fuel flow gauge and EGT but obviously this thing needs some further work. The idle mixture has been set so we're getting the recommended 50 rpm rise with the mixture idle cut-off.
Can anyone tell me what's happening here? Where can further adjustments be made? Could it be the mechanics pressure gauges are wrong and there is still too much fuel pressure. Something else in the system that's screwing things up? Any insights into this would be much appreciated.