T206H fuel issues when hot

D

David Augspurger

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Dirtracer35
Flew my 206 approx a 1 hour flight at 3000 feet engine ran perfect no issues. As I was taxiing in
I noticed at idle the engine seemed a little rough. Went to the fuel pump and topped off with fuel. When I restarted the engine it would only run with the electric boost pump on. Let it run for about 5 minutes taxied to the front of the FBO and shut it off. Started it again and taxied to a parking spot, still would only run on the electric pump. We contacted the maintenance shop on the field and since it was after 5pm the mechanic said he would look at it in the AM. Got a rental car and drove home. The mechanic called me the next day and said the aircraft ran perfect. Does anyone have an idea what happened? I had them pull the fuel pump and fuel controller to have them tested.
Thanks
David
 
Ur engine driven fuel pump should overcome any vapor issues. Have your mechanic check fuel pressure settings on the divider. Depending on time your pump may need an overhaul. Might need to flow test the servo as well.

Also have him verify that the check valves on the fuel overflow manifolds have been replaced as per the SB.

I have the same plane and just spent a lot of money solving a similar problem.

Edit to add: u shouldn’t experience vaporlock issues with the engine running. On a hotstart, sure, all FI Lycomings and Contis can be a PITA, but once that hot fuel is processed and the engine is running then it shouldn’t be an issue.
U have a fuel problem somewhere. Sort it out.

How many hours on ur pump/engine?
 
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Sierra Victor said:
Ur engine driven fuel pump should overcome any vapor issues. Have your mechanic check fuel pressure settings on the divider. Depending on time your pump may need an overhaul. Might need to flow test the servo as well.

Also have him verify that the check valves on the fuel overflow manifolds have been replaced as per the SB.

I have the same plane and just spent a lot of money solving a similar problem.

Edit to add: u shouldn’t experience vaporlock issues with the engine running. On a hotstart, sure, all FI Lycomings and Contis can be a PITA, but once that hot fuel is processed and the engine is running then it shouldn’t be an issue.
U have a fuel problem somewhere. Sort it out.

How many hours on ur pump/engine?
Click to expand...
Well... Cessna delivers new 206’s that are broken. I’ve demonstrated new airplanes to potential owners that in the heat of the day with a heat soaked turbocharged engine needed the pump on to run at low idle speeds. You could either bump up the idle or turn on the boost pump to resolve the issue. I’m not dismissing the maintenance issues you fixed on your airplane. I’m just saying they might not exist on the OP’s
 
Tarheelpilot said:
Well... Cessna delivers new 206’s that are broken. I’ve demonstrated new airplanes to potential owners that in the heat of the day with a heat soaked turbocharged engine needed the pump on to run at low idle speeds. You could either bump up the idle or turn on the boost pump to resolve the issue. I’m not dismissing the maintenance issues you fixed on your airplane. I’m just saying they might not exist on the OP’s
Click to expand...

Interesting.....
First I’ve heard of this and I’ve spoken w a LOT of 206 drivers. Not dismissing your experience at all!!! Glad for the input.
You’ll get a PM from me for more info soon, so thanks in advance!
 
Sierra Victor said:
Interesting.....
First I’ve heard of this and I’ve spoken w a LOT of 206 drivers. Not dismissing your experience at all!!! Glad for the input.
You’ll get a PM from me for more info soon, so thanks in advance!
Click to expand...
Don’t call me a 206 driver. It’s misleading. I have only flown two of them. Both new production about 9 years ago that were not that far apart in serial number. There may have actually been something wrong with them. New doesn’t mean correct, as I’m sure you already knew
 
Was your fuel pump overhauled 150 hrs ago?
Did u check the check valves on the fuel overflow? U can visually see them.
How does it run when cold?
 
Tarheelpilot said:
Don’t call me a 206 driver. It’s misleading. I have only flown two of them. Both new production about 9 years ago that were not that far apart in serial number. There may have actually been something wrong with them. New doesn’t mean correct, as I’m sure you already knew
Click to expand...

Got it.
Looking back through my logs I am amazed at all the items that were replaced within the first 100 hours. Of course warranty plays a role there but still reminds me that new doesn’t always mean correct.

BTW there were fuel issues with the re start 206s. My fuel pump and boost pump were replaced per SDs.
 
Yes the fuel pump was overhauled with the engine. Runs good when cold however the mixture can only be leaned slightly otherwise it won't take the throttle to taxi. Where are the fuel check valves located?

Thanks
David
 
David Augspurger said:
Yes the fuel pump was overhauled with the engine. Runs good when cold however the mixture can only be leaned slightly otherwise it won't take the throttle to taxi. Where are the fuel check valves located?

Thanks
David
Click to expand...

There is one on each side under the manifold. Cast AL shaped like a T w stainless limes running into each side.
On the outflow (bottom) should be a check valve.
If u have an engine monitor what does it say?
Did u do a full power run up?
 
really didn't pay attention to the engine monitor. It was nowhere near running good enough to do a run up.

Thanks
David
 
I’ve flown a good deal of time behind a IO 550ed 206 and have some time on my io520 185, vapor lock on a quick turn shutdown is something to learn, but vapor lock while running, never experienced that and that would be a little concerning to me.

Never understood why folks buy the new 206s vs the tried and true no nonsense U206s, especially when 550ed
 
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James331 said:
I’ve flown a good deal of time behind a IO 550ed 206 and have some time on my io520 185, vapor lock on a quick turn shutdown is something to learn, but vapor lock while running, never experienced that and that would be a little concerning to me.

Never understood why folks buy the new 206s vs the tried and true no nonsense U206s, especially when 550ed
Click to expand...

Good job with the insult!

Why do u always feel the need to remind everyone that your such a badass?
 
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David Augspurger said:
really didn't pay attention to the engine monitor. It was nowhere near running good enough to do a run up.

Thanks
David
Click to expand...

If u have a good engine monitor I’d strongly suggest downloading the last few flights. There might be something there that would point u and your mechanic to the problem.

BTW my airplane wouldn’t idle at 1000 rpm when hot w/out the boost. Worked fine at 1500 and at 800. Flew well too. Spoke w GAMI and they had a good explanation for this, considering the problem we found.

If youre still AOG and your mechanic is stumped I’d be happy to put you in touch w my guy. We just spent a month learning all about tio 540 Lycomings and fuel related issues.
 
Sierra Victor said:
Good job with the insult!

Why do u always feel the need to remind everyone that your such a badass?
Click to expand...

I know I’m not wicked sensitive, but that wasn’t an insult.
 
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