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  #1  
Old 03-12-2021, 04:29 AM
RV12Pilot RV12Pilot is offline
 
Join Date: Jun 2020
Location: Williamson GA
Posts: 10
Default Small black particles in fuel

The last two flights when I tested the fuel I saw small (very small) black particles in the fuel tester. Any thoughts? Thank you, Charlie
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  #2  
Old 03-12-2021, 06:16 AM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
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Contaminated fuel and airplanes don't go together! You can use a "Mr Funnel" to ensure only clean fuel gets into the tank and also help work out the source of the contamination. Possibly the contamination comes from where you buy it, or during handling. Good thing you picked it up while testing.
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  #3  
Old 03-12-2021, 06:32 AM
219PB 219PB is offline
 
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Potentially from the O-ring on the fuel tank sample valve.
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  #4  
Old 03-12-2021, 06:39 AM
BillL BillL is online now
 
Join Date: Sep 2007
Location: Central IL
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Once I was the secretary/maintenance "volunteer" for 3 busy club planes, all cessna. One had a gritty feeling in the drain. Skipping ahead, we got a small cup of sand and small gravel from that tank. It turns out when standing on the ladder and lowering the fuel nozzle to the ground (from the ladder) it scooped up a little sand each time (in the wet pipe) it touched down. Think about how high wingers do that.

It could be something similar at your location . . depending on typical traffic, tarmac conditions and if people use a cap on the nozzle. Look in your fuel tank to see if there is more in that upper compartment against the ribs. Ooh - sorry you can't do that on a 12.
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  #5  
Old 03-12-2021, 06:58 AM
Flyingleap Flyingleap is offline
 
Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 133
Default Small Black Particles

Paul is right!! A few (10) years back I found the same in my "tester" and started to make the FBO aware of the problem. Also, no additional fuel was purchased from that FBO(home base at the time). In the mean time a Christen Eagle based a few hangars down had an engine "failure" from the same small black particles in the fuel injection system. He made it, no damage, but the Christen Eagle fuel injection system was contaminated from one end to the other.

Needless to say, never bought fuel from them again, no matter what they told me. John
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  #6  
Old 03-12-2021, 07:57 AM
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Piper J3 Piper J3 is online now
 
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OP has only five posts so perhaps airplane is in early flight stage. That being the case, it may take a few tanks of fuel to flush debris leftover from building process.

I'm going to get lambasted for this... the very fine screen in the gascolator will prevent small particles from entering fuel lines to the carburetors. The large volume in the gascolator, compared to the small ID fuel line, allows the flow to slow down and particulates to settle out.
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  #7  
Old 03-12-2021, 08:04 AM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Quote:
Originally Posted by Piper J3 View Post
I'm going to get lambasted for this... the very fine screen in the gascolator will prevent small particles from entering fuel lines to the carburetors. The large volume in the gascolator, compared to the small ID fuel line, allows the flow to slow down and particulates to settle out.
That's kind of the whole point of the gascolator, isn't it?
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  #8  
Old 03-12-2021, 09:10 AM
pa38112 pa38112 is offline
 
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If you get it again, tr to filter them through a paper towl and dry them. Then alaize under a magnifying glass to assertain their texture and hardness.
It could be Pro-seal.
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  #9  
Old 03-12-2021, 09:21 AM
RV12Pilot RV12Pilot is offline
 
Join Date: Jun 2020
Location: Williamson GA
Posts: 10
Default Small black particles in fuel

The airport that we hangar at installed a new fuel tank a couple of weeks ago. My son, who has a Cherokee 6, also gets fuel at the same airport. Iíll ask him if heís seeing any of this.
If he doesnít then Iíll need to explore the other suggestions for sure.

Thank you
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  #10  
Old 03-12-2021, 09:25 AM
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Carl Froehlich Carl Froehlich is online now
 
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Location: Dogwood Airpark (VA42)
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Quote:
Originally Posted by Piper J3 View Post
OP has only five posts so perhaps airplane is in early flight stage. That being the case, it may take a few tanks of fuel to flush debris leftover from building process.
SNIP
Exactly.

New tanks need to be flushed, I donít care how tidy you were making them. Sump as needed to get a clear sample. Next make a simple jumper from the firewall fuel line connection to five gallon cans - the jumper fuel line with a cheap, clear plastic fuel filter so you can refuse the fuel for more flushes. Repeat as needed. Remove the ship fuel filter, inspect it and clean as needed. Do this before ever sending fuel to the engine.

This process is also a good time to measure fuel flow and to calibrate your float senders.

Carl
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