Check your screens

[Yetti]

The top right of the Mooney annual inspection/100 hour says "1. Inspect fuel injection system, clean screens & injector nozzles (refer to Textron Lycoming O/H Manual, Section 8 or TCM Service Manual."

 

So with a wrench remove the fuel hose

 

 

And a socket

 

 

To clean the screen you tap it on the table and stuff comes out.

 

and you keep tapping it and more stuff comes out

 

 

 

It kind of looks like someone left a paper towel in the line.  There is a spring that will allow fuel to bypass.

 

Check down the bore to see what is there and replace the O rings for RSA 5 fuel servo

 

 

Reassemble and now know that fuel will go to the injectors as planned.

Edited September 3, 2019 by Yetti

[jetdriven]

That stuff didn't happen between a year ago and now. Another thing, whoever buys our plane gets an annual squawk list plus the mooney annual inspection checklist. Not some bullshit entry saying the annual was done and thats it.

PS all the sealing o-rings since at least 2010 have been blue. Yours is orange

[Yetti]

The list of items that A&Ps have signed off as "airworthy" is lengthy and continues to grow.  The good news is that as we continue to go through the plane, the confidence of actual airworthiness continues to build.

[Browncbr1]

I had my entire fuel system rebuilt immediately after taking possession. Money well spent in my opinion. Is sounds like the Winchester, TN C that went down the other day may have had something bad in the fuel system after sitting so many years and a quick "annual inspection"

[Steve65E-NC]

Can someone list the 0-ring or rings for this main fuel screen inspection operation on a Lycoming IO-360-A1A.  I am assembling parts for my May annual.  We usually use something like Hoppes #9 gun cleaner on individual injectors.  Would this also be appropriate on the main screen assembly?

 

[MB65E]

I have them at the hangar and I'll try and get a P/N posted.  The RSA10 and the RSA5 do not share the same O-ring.  Most are blue some are black.  I've never see an orange one, or that much crap.  A lot of lint once from a rag in a tank but that was it.  Thanks for posting the thread!  Its a bit of a peeve of mine. Nobody seems to check the inlet screens from what I can tell, let alone change the O-rings.  There are 2, one on the finger screen and one on the threaded fitting/union.

cheers,

-Matt 

[neilpilot]

I had my entire fuel system rebuilt immediately after taking possession. Money well spent in my opinion. Is sounds like the Winchester, TN C that went down the other day may have had something bad in the fuel system after sitting so many years and a quick "annual inspection"

Good advice, but I suffered fuel starvation and an off field landing about a year after my 64E system overhauled.  Broken piece of O-ring blocked fuel delivery.  See NTSB full report for N1310W, July 2012.

[carusoam]

So...

What is all the 'stuff' that the OP shook out of the one screen?

That looks like something is crumbling and going away like a hose lining. Or is something oxidizing and flaking off in there?

Is that caused by straining thousands of gallons of fuel or by straining on five gallons of fuel in a year?

I don't have enough fuel injection experience.

Best regards,

-a-

[Shadrach]

We've all seen the fine mesh screen at the gas collator. I'm curious how this stuff got by that. IIRC, the only thing between the gascolator and this screen is an electric fuel pump and a mechanical fuel pump (maybe a fuel transducer as well if so equipped). I would have the fuel system IRAN'd by a fuel specialist. Money well spent.

[Yetti]

It is kind of a fiber type material, so we are guess someone stuffed  a paper towel in a line past the fuel selector and then forgot it, maybe while the pump was being replaced.   All the hoses are new so we will flush the lines anyways.  In other good news, the plane came with a Weldon pump.  So no self destructing Duke to send plastic parts up stream.  It is possible that the material was acting like a paper filter and passing fuel, or the screen went to bypass.

[Shadrach]

When was the servo last opened?

[MB65E]

On the RSA5 Fuel servo, installed on most 4 cylinder Injected Lycomings, the o-rings are:

Larger blue o-ring P/N 951789

Smaller black o-ring on the screen itself P/N 953541-10

 

The plug gasket to satisfy the the AD that's not stamped "G" yet is P/N 2577258.  I think this is the same P/N for the RSA10 fuel servo. But the O-rings are not the same.

 

The larger fuel servo installed on most 6 cylinder Lycoming's is the RSA10.  Its o-rings for the inlet screen are:

Larger P/N 951790, smaller P/N 951392.

 

I purchased mine from RLB Accessory Services  630-543-9213.  Ask for Butch or Bob.

 

 

Hope this helps, but double check with your vendor and IPC.

 

-Matt

[Guest]

That stuff didn't happen between a year ago and now. Another thing, whoever buys our plane gets an annual squawk list plus the mooney annual inspection checklist. Not some bullshit entry saying the annual was done and thats it.

PS all the sealing o-rings since at least 2010 have been blue. Yours is orange

That goes right with "pullies lubricated and cables checked"

Clarence

[Yetti]

Thanks for the part numbers.

[MyNameIsNobody]

I have them at the hangar and I'll try and get a P/N posted.  The RSA10 and the RSA5 do not share the same O-ring.  Most are blue some are black.  I've never see an orange one, or that much crap.  A lot of lint once from a rag in a tank but that was it.  Thanks for posting the thread!  Its a bit of a peeve of mine. Nobody seems to check the inlet screens from what I can tell, let alone change the O-rings.  There are 2, one on the finger screen and one on the threaded fitting/union.

cheers,

-Matt

You are correct. Nobody's Airframe log from 1-15 annual: Cleaned main fuel strainer...

[Browncbr1]

Good advice, but I suffered fuel starvation and an off field landing about a year after my 64E system overhauled. Broken piece of O-ring blocked fuel delivery. See NTSB full report for N1310W, July 2012.

Where was the oring debris from? Pump, gascolator, spider??

[DaV8or]

As to where the debris came from, I would seriously look at the hoses. Two possibilities-

1. The "new" hose really isn't. The log entries don't inspire confidence so far.
2. The new hose is defective, or the wrong one.

Number two on this list is exactly what happened to me. Not to go into my whole big long story about why my plane was stuck in Red Bluff, CA for two weeks, but basically, the new hose that was put on the previous year and was manufactured by Sacramento Sky Ranch, was either defective, or the wrong type of hose. It shed material much like in the photo and clogged the #2 port of my flow divider. Unfortunately, Sac Sky Ranch has since gone out of business, so I couldn't go over there and smack them on the head with it.

 

Anyhow, new hose and two years later, so far no more issues.

[Guest]

There is another screen/ filter no some models. There is an AD/ SB calling for the installation of an inline filter on the outlet side of certainnDukes fuel pumps.

Ref AD80-13-03 and sb M20-222.

There is no mention in the documentation saying to clean it. Many of the ones I've seen we're very dirty.

Clarence

[Shadrach]

Looking closely at you last paper towel pic.  That looks as if it could be very old and deteriorated tank sealant. Tanish brown in color and powdery. 

[RobertGary1]

That finger screen can be accessed from the other side as well. I typically remove it from the opposite side of the servo. No need to remove the line.

 

-Robert