8KCAB Fuel Pressure Snubber

Bartman said:
what is that piece in the middle? the thread looks like pipe thread
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You mean the greasy black elbow? Damned if I know. Chad says that piece has a restricted orifice too. I asked if I could buy one. But the factory elbow terminates at a hose fitting, while I need a bubble flare fitting, or whatever the hell terminates my stainless gauge line.

This thing is turning into a debacle.
 
No, the brassy plug looking part. Does the hole go all of the way through? You might want to call a shop that overhauls fuel system components, they would probably be able to help explain some of this stuff.

Poor Chad, he must be swamped with all of us building airplanes and constantly calling him for parts and with whacked out questions! lol
 
Bob Turner said:
A lot of IAs get really uptight about TSO. The original Bellanca Champs came with auto gauges, so one can assume they can be replaced with same. Mine have never failed, so they remain in place, but I did the panel so I can easily bolt in standard 2 1/4” instruments.
I would have to see the regulation on TSO - I am only an expert on non-TSO avionics.
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As I understand it, if the factory uses a non-aircraft part and the FAA approves it, it then becomes an aircraft grade part for that aircraft design only. Replacing auto gauges with auto gauges would be allowed, in my humble opinion.
 
Bartman said:
what's on the other side of that fitting? it kind of looks like a plug for a hole that is supposed to have compression fitting in it.
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The other side of the hole is the middle picture in post #9.

Spoke to Chad more today. Here are the two fittings available. The brass fitting at left is for my setup, which is a stainless line to a mechanical gauge. The black fitting at right is for a hose connection to an electronic sender. I will order both, so I have an upgrade option.

fittings - Copy.webp
 
I installed the snubber and flew today. HUGE improvement. Zero flutter on the gauge needle. I highly recommend this little gadget.

I have been obsessed with getting rid of my mechanical fuel gauge, because I did not feel safe with that pressurized line running into the cockpit. With this setup, I am rethinking that. The mesh snubber is G grade, meaning it is only permeable by gasses (not gas, as in avgas). Even a complete break of the gauge line would result in very minimal leakage, just the contents of the line from the break to the gauge. And the elbow would provide redundancy.
 
Big Ed. Old post but did you use the 90deg brass “restrictor” (in the airline world, those fluid loss traps are called hydraulic fuses) or just go straight into the servo? In other words, no additional parts except the snubber. Hope you can answer this. Thanks.
 
He can't. But this is a topic that was left hanging - he apparently got the correct part for most of us with older Decathlons, then left the forum without giving us the part number.
I still haven't fixed this area, and someday may regret it - $35 for peace of mind and a non-fluctuating gauge? Worth it!
 
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