Hose question

[jamesm]

I am having a discussion with another A&P & IA about hoses.  Had fuel pressure line  from carburetor to fuel pressure transducer on the engine monitor  CGR30 which is -2 diameter hose. it a -2 at carb and it's a -2 at the pressure transducer. the hose  started spraying to confirm it really was the hose, we removed it plugged one end and blew air soapy water and watched the soap bubble.  I have been down road a gazillion times but found no real definitive answer.  both the manifold pressure line and fuel pressure line off the carburetor has -2 fittings. problem is that the so called fuel rated hose material doesn't really start until you get to -3  diameter and larger diameters. If you use Aluminum line it work hardens I have happen to me twice. IMHO it would be stupid to run fuel through in such a small of diameter which would break frequent .  I suppose you put couplers and  reducers and enlargers  and you would have about 1/2 foot of fittings pron to leak. Maybe it's done out in field but I would suspect I would seen it all people 's pictures of their plane  photos. If  I look at Parker page the 193 hose is for vacuum and air on Mcfarlane web site. I have found plenty of Hose material compatible of supporting Fuel and Oil by haven't found one that supports that is -2 diameter  hose diameter. . What Guidance do I have or where would I go to find -2 diameter hose material that supports "Fuel".

Please advise,

James '67C

[N201MKTurbo]

Call a hose shop. 
 

If you look in the Stratoflex catalog, it shows all the different hose/fitting combinations.

[N201MKTurbo]

What does the IPC call for?

[jamesm]

I can't find it for such a small diameter.

 

[jamesm]

Here is what I found… https://aircrafthosestore.com/pages/how-to-choose-an-aircraft-hose

as expected no -2 hose are made for fuel pressure line from carburetor to fuel pressure gauge. I tried to find it in the Mooney maintenance manual and IPC. No luck

[N201MKTurbo]

28 minutes ago, jamesm said:

Here is what I found… https://aircrafthosestore.com/pages/how-to-choose-an-aircraft-hose

as expected no -2 hose are made for fuel pressure line from carburetor to fuel pressure gauge. I tried to find it in the Mooney maintenance manual and IPC. No luck

That is a tiny fraction of what’s in the Stratoflex catalog.

[Fly Boomer]

12 hours ago, jamesm said:

I can't find it for such a small diameter.

According to the Statoflex catalog, 124-3 is about a quarter-inch OD.  Yours is smaller?

[jamesm]

Here is what I found… https://aircrafthosestore.com/pages/how-to-choose-an-aircraft-hose

as expected no -2 hose are made for fuel pressure line from carburetor to fuel pressure gauge. I tried to find it in the Mooney maintenance manual and IPC. No luck

[jamesm]

Yes if I recall correctly that the original fuel pressure/ manifold pressure gauge, used a -2 fittings on gauge and the firewall fittings to respective sources.  The manifold pressure gauge used an aluminum line (right/ wrong or indifferent) at least since the time the plane has been in the family since 1984. 

[Gee Bee Aeroproducts]

Milh5593 is not approved for fuel and oil .

I suggest and I have designed a female -2 to step -3 flare adapter for firewall

Then change fitting on carb to alloy -3

Next , I build tso Teflon hose -3 to your spec.

Firesleeve Black or Blue

I designed this for 1947 to 1971 Beechcraft models -2

oil psi

Fuel Psi

manifold psi

I have been designing hoses and adapters tso since 1987.

Iam the only tso PT6 hose supplier for aftermarket.

i dont do anything based on cost only quality.

 

last picture is tio541

20 hose assys

4775.00

i have to mfg the prop accumaltors next week .

these are engine

not airframe to engine 

 

 

 

Edited 14 hours ago by Gee Bee Aeroproducts

[N201MKTurbo]

https://www.parker.com/us/en/divisions/stratoflex-products-division.html
 

https://aircrafthosestore.com/pages/current-catalogs

 

[Gee Bee Aeroproducts]

Just a follow up

I can mfg a tso -2 Teflon , but the fittings are expensive, changing to -3 is half the cost .

Iam doing a -3 fuel vent tomorrow 

Gauge to firewall 

Firewall to baffle 

This is in case of fuel gauge failure and fuel goes overboard.

cost is 477.50 with anti chafe .