Clogged injectors, amber colored particulate in fuel, no tank leaks

[AerostarDriver]

An update, I have been working on flushing the tanks and lines. After three flush cycles I am no longer getting particulate out of the sump or seeing anything in the 5 Micron filter that I am running the fuel I have been using to flush the tanks.  I recoat is still very likely in my future, I am not a fan of leaving things without a definite resolution. However, to confirm I am not getting particulate in the fuel I need to fly it again as the only time I was seeing the particulate was in post flight.   

[carusoam]

Keep up the vigilance...

-a-

[Yourpilotincommand]

Would it be possible a dirt dobber or other insect made a nest somewhere in or near the fuel tank vent? … and could dirt/sand get blown into the vent from takeoff/landings in a dirt strip? 

[Fly Boomer]

On 5/16/2021 at 11:27 PM, AerostarDriver said:

After landing and trying to resolve the issue I am finding that I have particulate that is amber in color and feels like grains of sand in the tanks.

Thought this was interesting (from ShortWingPipers.org):

I have been using EZ Turn ever since I ran out of Fuel Lube years ago. I use tight Seal on some gaskets etc. There is an article in the latest Cub Clues about Tight Seal breaking down in auto gas and leaving behind tiny granules.

[Shadrach]

On 5/17/2021 at 9:17 AM, AerostarDriver said:

All fuel hoses have been replaced over the last 5 years. Not ruling this out as a possibility but the particualte is in the tanks at the end of the flight. Their should not be enough back flow through the lines to bring it back to both tanks at the end of the flight. 

I just pulled the Gascolator screen, SB/AD filter and screen in the fuel servo at annual 4.3 hours ago. All of them had small amounts of the amber color particulate but also large amounts of black/gray proseal looking chunks in them but I was not sure what wing they were from. The back story on my airplane is last year the wing was replaced and that wing had pretty large leaks. My IA and I assumed the proseal looking chunks were from the old wing as the previous owner had never seen this amber colored particulate before.

I am about to pull them all again and check, however, I suspect they are all going to be pretty contaminated. I also am going to pull all the lines from the fuel selector forward and blow them out.

Update: My IA is going to drain and borescope the tanks. We plan on trying to flush the tanks to see if we can nock as much of the loose sealant off as possible and see where we end up. 

Really old tank sealant can break down into a gritty, tan, powdery substance. Whatever it is, I am surprised it’s getting bast the  I am surprised it made it past the gascolator screen.

[A64Pilot]

I had a C-210 that clogged injectors a couple of times. Tiny black granules. I believe it was a deteriorating hose because it went away when we changed hoses. They got past the gascolator and the screen in the servo.

[carusoam]

There is a rubber hose with a liner as part of the fuel injection system….

Known for falling apart and blocking fuel injectors…

hence the reason for cleaning and catching the part to find out where it is coming from…

Pp thoughts only,

-a-