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ls6pilot

Fuel filter inspection tips

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CTSW was running rough when in route climb so I landed at a nearby airport. There was some jump in the car bowls which I cleaned there was minimal debris in the gascolator  which I removed and cleaned the screen. Tested fuel flow From both tanks and it is way down. Next step I expect is to check the fuel filter. I have located it but need some tips for removing and inspecting as I have not done that before. Appreciate any advice that comes my way. Thanks guys

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It depends a little on how it is installed and the aircraft equipment, and if the firewall blanket installation was properly performed.

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You can send me your telephone number and when a good time to call is, and I will give you a call. I can't see enough detail about the installation to make a suggestion on how to proceed. 

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7 hours ago, Tom Baker said:

You can send me your telephone number and when a good time to call is, and I will give you a call. I can't see enough detail about the installation to make a suggestion on how to proceed. 

Thanks for you help, Tom.

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Thanks Tom for the offer sent you a PM last night

I managed to get the fuel filter out.   . It had a small amount of debris. Cleaned and replaced. Still very low fuel flow. Wondering if there is a way to detect if the obstruction is between the fuel filter and gascolator or between tanks and fuel filter. Appreciate advice on next steps as I am somewhat stranded at a small airport. Thanks

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Very low fuel flow? Is this from your instruments? Or did you open the gascolator and measure it. Chapter 6 of the maintenance manual tells how to do this but it involves draining the tanks, putting in a minimum amount to one tank, etc, etc. In this test they call for a flow of about 0.58L per minute or 35L/hour.

Being away from home you probably don't want to do this unless you have to. So, do a quick check. Mine, with between 15-20 gallons total aboard, will give me a liter in 37 seconds +/-. Try it to see what you get. If you don't get about what I am getting then you may need to dig deeper.

Tom, if this isn't a good idea please chime in and correct me. Thanks.

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48 minutes ago, sandpiper said:

Very low fuel flow? Is this from your instruments? Or did you open the gascolator and measure it. Chapter 6 of the maintenance manual tells how to do this but it involves draining the tanks, putting in a minimum amount to one tank, etc, etc. In this test they call for a flow of about 0.58L per minute or 35L/hour.

Being away from home you probably don't want to do this unless you have to. So, do a quick check. Mine, with between 15-20 gallons total aboard, will give me a liter in 37 seconds +/-. Try it to see what you get. If you don't get about what I am getting then you may need to dig deeper.

Tom, if this isn't a good idea please chime in and correct me. Thanks.

We talked this morning, and he said he was only getting around 3 GPH measured with the gascolator bowl removed. That is not enough to run at full power. He was going to pick a point up stream and check flow there.

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57 minutes ago, Tom Baker said:

We talked this morning, and he said he was only getting around 3 GPH measured with the gascolator bowl removed. That is not enough to run at full power. He was going to pick a point up stream and check flow there.

Right. That 35L/hr is 9.5 gph according to the book. Kinked or collapsed hose? If it is the tank filters it would be unusual for both to be clogged I would think. Hope someone didn't put something in his tanks.

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2 hours ago, sandpiper said:

Right. That 35L/hr is 9.5 gph according to the book. Kinked or collapsed hose? If it is the tank filters it would be unusual for both to be clogged I would think. Hope someone didn't put something in his tanks.

With the fuel flow I normally see around 20 GPH when draining fuel through the quick drain.

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Just a thought. Try the fuel flow measurements with the gas caps off.  If the vent lines are full of fuel it may impede air inflow??? I am convinced that vent lines containing fuel are a factor in why gas tanks don't equalize their levels overnight.

If there is a change in fuel flow with the gas caps off try taking the gas caps off and blowing with your mouth in the vent hole at each wing tip to clear the fuel out of the vents. Definitely don't want to pressurize your tanks so take the caps off while you blow.

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30 minutes ago, MEH said:

Just a thought. Try the fuel flow measurements with the gas caps off.  If the vent lines are full of fuel it may impede air inflow??? I am convinced that vent lines containing fuel are a factor in why gas tanks don't equalize their levels overnight.

If there is a change in fuel flow with the gas caps off try taking the gas caps off and blowing with your mouth in the vent hole at each wing tip to clear the fuel out of the vents. Definitely don't want to pressurize your tanks so take the caps off while you blow.

The CTSW doesn't have vent lines. The vents are stand pipe in the caps.

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That is an amazing amount of debris! I wonder what might be in the tank filters? Might be worth a look.

Thank you for posting. All of us have learned something.

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Thanks for posting that picture.

Those larger chunks of debris resemble the material which lines the fuel tank. Could that be possible? Debris may have been in that valve for a long time. If that's the case, Mr. Funnel would Have been of no help.

would be nice to know the composition and origin of the debris pictured.

Again . . . good catch!

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I have seen that fuzz in the filter screens before. Your valve has probably been collecting it since new. I found the Mr. Funnel to be a pain. It doesn’t drain out completely and that little quantity of gas makes a mess.

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1 hour ago, WmInce said:

Thanks for posting that picture.

Those larger chunks of debris resemble the material which lines the fuel tank. Could that be possible? Debris may have been in that valve for a long time. If that's the case, Mr. Funnel would Have been of no help.

would be nice to know the composition and origin of the debris pictured.

Again . . . good catch!

It could be possibly from the tank itself. Any ideas on how to analyze the debris?  If it is coming from the wing tanks does that need to be addressed? 

Thanks

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The first time I inspected my in-line filter there was a bunch of fiberglass fuzz and some debris.  I suspect this was from the manufacturing process of drilling the bung and other holes without meticulous cleanup.  Tip has fished out the round cut-out from one of his tanks that was generated when Flight Design cut the fueling hole. Not sure their QA is that good with regards to cleanup of the tanks. My tanks have made no debris in the two years since the initial in-line filter clean out. 746340038_FuelFilte.thumb.jpeg.1ba86c6a4406409385d2d77dd50c4b39.jpeg

 

 

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We are dealing with this right now too. One of our members lost a good amount of power on a recent flight. We cleaned out debris from a few different points: gascolator, fuel filter. We are suspecting contaminated fuel but no conclusion yet. 

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14 hours ago, ls6pilot said:

debris in fuel cutoff valve. 68131217-76CE-407B-9322-BE2E55C1E59F.jpeg.8d4464c424d824fbd51d6e683b3dedfd.jpeg

Mr. Funnel. My new best friend. 
 

 

Last year in Feb I found a lot of rust in the gascolator . It was not the gascolator itself rusting , just very fine rust contamination for fuel. I have bee using Mr Funnel since then and this year the gascolator was 100% clean ( still using the same fuel sources )

 

5058CAFD-352F-401B-A584-8AEC8FEF4FEC.jpeg

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