jvaliensi

My Feedback: (1)

MAP air traps (and others) have a nice built in fuel filter. Is there any need to run another filter before the turbine?

FenderBean

you will get a lot of opinions on this, no wrong answer for this topic.

sewbusy

Some pilots do, & some don't. It's just what you feel comfortable with. If in doubt, go by what the turbine manufacturer recommends.

Dave Wilshere

We exclusively use MAP bubble traps and we always run a filter as prescribed by JetCat. Rxi turbines have filters under the purple cover, exterior pump turbines are always supplied with a filter.

Following the manufacturers recommendation is best advice, they know 99% will be using a filtered bubble trap, so if they show a filter it’s needed.

Len Todd

The UAT is usually placed before the pump. Many manufacturers indicate one should put a filter in after the fuel pump to catch any debris that may be generated by the fuel pump. Jet Cat RXIs have a built in filter in the turbine cowl and do NOT recommend an additional filter. Manufacturers of turbines with an external fuel pump typically recommend having a filter put in between the pump and the engine.

Agrav8ed

This ^^^^ is the correct practice and should be followed in my opinion. Before I started with turbines I looked an many different set ups and this method was a constant for a reason.
Tone

jvaliensi

My Feedback: (1)

I know that Gaspar does not want a filter or valve between the X-series turbines and the pump.

Turbine pumps are well lubricated gear pumps. What kind of debris comes out of them?

BTW - I added the recommended filter between the pump and my P100-Rx.

ravill

My Feedback: (11)

No filter for me. I’ve had algae clog one up once causing me a flame out.

camss69

My Feedback: (46)

Need to put a little of this in your fuel and you won’t have that problem.

joeflyer

My Feedback: (48)

It's better to clog the filter than to clog the injectors. That's why one is recommended.

Vincent

My Feedback: (61)

Filters trap air...i never use them down stream.

sewbusy

I’ve used KingTech over the past 3.5 years. In their Instruction Manual on page 14 it specifically states how to mount the supplied filter and why. It should be mounted vertically so that air is not trapped.
See photo. Maybe if a pilot mounts it horizontally, that is when the filter can trap air.

Len Todd

Better to address the root cause of the filter clogging (i.e. poor fuel management somewhere along the line), The clogged filter probably saved the turbine anyway!

sysiek

My Feedback: (176)

I never have the algae growth in my fuel maybe because I’m always using biobor addictive, just one square cm to 5gallon and this works perfect even truth the full winter, + I’m always using the Bvm style uat at least I can detect vacuum in my vent or fuel system, if the uat collapse that’s mean that you have vacuum problem not clogged uat and other very important thing is to never use festo style connectors on vacuum they only work on pressure never vacuum

Len Todd

I occasionally use festo fittings on my JetCat RXIes. I never had a problem doing that. But, ...I use festo type fuel lines, large vents, large lines and large clunks. All the fittings are also large. If there are two tanks in parallel, then there are two large vents versus coupling the one vent to two tanks. IMO if there is in-leakage at a festo fitting, then there is an constraint in the fuel system that creates an unnecessary level of vacuum. Also, I tend to not reuse any festo fitting that suffered through a significant crash. There is no telling what happened inside those fittings when the fuel line is ripped out of them.

Dave Wilshere

Festo connectors work fine on fuel draw situations…like all JetCat RXi turbines, step downs from UAT to pump etc.
People have problems because they put Tygon into Festo…1000x No no. Because they use too small fuel lines feed and vent. Undersize Vent fitting, undersize fuel clunk pick ups etc etc etc.
I spent some of this weekends Jet meeting updating people’s fuel systems to the equipment I use and they won’t have an issue from now on.

new2-2jets

That be me then 😭, mind you I'm glad I got all the stuff I needed, managed to fit it all while listening to the rain beating down on the hanger at Bucky. Yet to test but went ok 👍 cheers Dave

👊

olnico

Tygon lines are not designed for continuous fuel immersion. They harden.

We recommend viton tubes that are designed for lifetime fuel immersion.
Either in metric size:
https://www.ultimate-jets.net/produc...535e8812&_ss=r

or imperial size ( thicker ):
https://www.ultimate-jets.net/produc...535e8812&_ss=r

Dave Wilshere

Mark 👍

Olly, well my several over 10 year old + Jets with the same Tygon clunk line disagree. It seems to depend on the Tygon and fuels/Oil. In the U.K. and Europe 99% use Tygon and we don’t have any issues…

new2-2jets

Cheers Dave, I was going to ring you today to ask-but don't need to now 👍

olnico

Well, Dave.
On this picture from your customer in the UK, one can clearly see the brown dark colour of the tygon tube used for the clunk line. One can also clearly see that the tygon has deformed around the barbed fitting.
This requires lines change, and I believe that this is what your customer is doing there, showing the old tygon, and a section of brand new one.
I can send you endless pictures of browned down/ hardened tygon lines from my models made and flown in France.

Dave Wilshere

He’s changing the lines not because they went hard, but because the Dubro bung started to leak and while he has it in pieces he’s updating to my bung, tube and clunk unit.

WimB

My Feedback: (1)

bring out the popcorn, here we go again with tygon and festo on suction....... :-)

Skunkwrks

So........ I agree with the Viton tubing as I used two pieces, between the pickup tip to the brass tube in the middle that rides on the bulkhead divider.
Then another piece of Viton tube from the brass tube to the lines bung plug, fastened with lock wire .
Been using Viton for five years on the Imac gas planes without any issue.
Tygon is only good for fuel line filling and venting from the tank.
Most Turbine manuals Don't recommend it for fuel supply as it can collapse under pressure.

Rusty

F900

My Feedback: (2)

Its never a straight answer here, ask 1 question you get 10 different answers lol