Do Fuel Flow Transducers Always need firesleeve

[gmonnig]

Nice! I am doing this same install too and came to the conclusion that 45degree elbows on the inlet and outlet side works the best for placement. I know EI says 90s are not good but 45degree fittings are fine. Their transducer is not a sensitive as the JPI. I’m glad I found this post because it answered my question to mounting it to the footwell. I thought there would be a ton of fatigue on the fittings with the transducer being rigidly mounted. 

[kortopates]

Nice! I am doing this same install too and came to the conclusion that 45degree elbows on the inlet and outlet side works the best for placement. I know EI says 90s are not good but 45degree fittings are fine. Their transducer is not a sensitive as the JPI. I’m glad I found this post because it answered my question to mounting it to the footwell. I thought there would be a ton of fatigue on the fittings with the transducer being rigidly mounted. 

You should consult your Mooney IPC, which depending on airframe will show Mooney’s trouble free mounting location and method. These can be very troublesome to install and get fluctuation free FF indications. No point in coming up with your own install when the factory has developed and documented a proven method.


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[gmonnig]

Yeah I imagine it’s similar to the J model listed above since my E has the IO-360 but the one in that diagram isn’t the EI transducer. Don’t think the 65’ E had official instructions from Mooney or the FAA. If they did, then I probably need to find it. The fuel line going into the fuel servo looks like fun to get to. 

[laytonl]

18 hours ago, gmonnig said:

Nice! I am doing this same install too and came to the conclusion that 45degree elbows on the inlet and outlet side works the best for placement. I know EI says 90s are not good but 45degree fittings are fine. Their transducer is not a sensitive as the JPI. I’m glad I found this post because it answered my question to mounting it to the footwell. I thought there would be a ton of fatigue on the fittings with the transducer being rigidly mounted. 

At SnF, EI told me 45’s are fine, provided they are on both sides of the transducer.  Lee

[Shadrach]

On 2/20/2023 at 6:57 AM, M20Doc said:

While a fire sleeve would be desired, wouldn’t what’s in the IPC be the ultimate decision maker?

So then no firesleeve…just like it left the factory!

[gmonnig]

2 minutes ago, laytonl said:

At SnF, EI told me 45’s are fine, provided they are on both sides of the transducer.  Lee

Awesome, I had heard from them about that. Im actually going to do the install that was suggested with the M20J install. I went back out to the plane today and took the fuel line off and took everything out. I’ll just order two new, short fuel lines with the transducer in between. Just a straight shot. I discussed my plan with my A&P and he said it’ll work good. Sucks to trash a 150hr old Teflon fuel line…. Airplanes…

[Shadrach]

On 2/22/2023 at 9:52 AM, A64Pilot said:

It is, but once Certified it has to be maintained to Type data.

So in other words I doubt a Manufacturer could get anything Certified without fire sleeve, I know where I worked it wasn’t even considered. No way would ATL ACO consider it I’m sure.

Even my 46 Cessna has a fire sleeved line from the Gascolator to the Carburator.

I don’t think it has been superseded unless CAR 3 / FAR 23 states it does, regs don’t die, they just get piled onto

So, even before CAR3 even existed, back almost 100 years ago a regulation pretty much made non fire sleeved rubber lines not applicable, do you think that’s been relaxed?

As a licensed mechanic no way would I consider installing a non fire sleeved line as I’m certain that I would lose that argument with an Inspector.

No fire-sleeve from the factory. I remedied that decades ago. Not having it sleeved is especially hard on the hose from the servo to the divider. It spends its life being cooked between cylinders 1 and 3. I remember changing hoses in the late 90s and it was apparent which hose was subjected to the most heat.

[PT20J]

2 hours ago, Shadrach said:

No fire-sleeve from the factory. I remedied that decades ago. Not having it sleeved is especially hard on the hose from the servo to the divider. It spends its life being cooked between cylinders 1 and 3. I remember changing hoses in the late 90s and it was apparent which hose was subjected to the most heat.

The line from the servo to the flow divider is part of the engine, so if that's the way it came, blame Lycoming. I know that my factory rebuilt IO-360-A3B6 came with that line firesleeved.

The M20J transducer from the Mooney factory is firesleeved (item 7 on the drawing Clarence supplied above).

[Shadrach]

39 minutes ago, PT20J said:

The line from the servo to the flow divider is part of the engine, so if that's the way it came, blame Lycoming. I know that my factory rebuilt IO-360-A3B6 came with that line firesleeved.

The M20J transducer from the Mooney factory is firesleeved (item 7 on the drawing Clarence supplied above).

One of many shortcomings of the early birds. Fortunately most are easy to remedy.
 

 

[Grandmas Flying Couch]

Just an FYI the transdeucer is fairly accurate at high fuel flows until I get into fuel flows in the 10 gph range then it bounces around + or - a gallon or so.  It's ok for me but it may be something where I try to get a straight fitting into at least the inlet.  The totalizer seems to be right on the money so the bouncing around must average out ok.  

[Jsno]

I had issues with the teflon hose with fire sleeve making the  bend from the transducer to the fuel pump.  I remedied it by using 701 hose instead of teflon.  The hose can be bent with a tighter radius.  Just have to replace it on condition in the future.

[Gee Bee Aeroproducts]

High psi Teflon has a better bend radius than med psi teflon 

I use Titeflex , oem on the PT6 engine hoses 

 

Per tso , we crimp fitting on one side , install

firesleeve, then the other fitting is crimped.

No other mfg can do this .

This tso assy used a less bulky firesleeve.

 

GB

 

GB