skippydiesel

I have a fair sample of this on my shelf BUT this is an in fuselage tank (don't want fumes let alone spillage) and I would like to think that I have chosen a product known to do an excellent job over extended period of time (nothing like a respondent with first hand experience /knowledge)

Ha ha! - Yours may gobble $50/hr min is about half😁

Thanks Thruster This will be a very small job (fitting a new fuel sensor flange), so I was hoping for something little less costly ($62 US + on costs is pretty scary)

Hi Brains Trust, In the very near future, I may have to make a small penetrant in my aluminium fuel thank. In itself not problem however I am concerned about long term sealing, of the fitting I will be putting in. Your recommendations for a reliable fuel tank sealer, readily available in Australia, will be much appreciated. Thanks in advance .

Bunnings Aero Space have a range of "Century" coil springs - If your local hasn't got what you want check out (https://www.centurysprings.com.au/products/prod_catalogue.htm

Do any Rotax 9 series experts out there have any comment on the Vans RV- 12/Rotax 912ULS advice?? It would seem that this Facet Cube 40135 is readily available in Australia, in the kit offering, Part Number FEP12SV Part Number: 40135 Kit Number: Type: Cube Volts: 12 Max/Min: 7.0 - 4.0 GPH: 32 Fuel Filter Fitting: 1/8 - 27 NPTF Lift Min: 36" Check Valve: N Positive Shut Off Valve: N Internal Fuel Filter: n/a Stainless Steel: N

If my maths is correct - Rotax 192ULS consumes less than 6.4 US Galls/hr (.32 Gals/3 min 1.2L/3mins) at Max power - 1US Gallon/3 minutes is a tad over the safety need.

I was sure I answered this but the.........???? I have had an on going, intermittent low fuel pressure warning during climb out - sounds much like the RV 12 story. Fuel pressures all as expected, on the ground & in air (strait & level) - after much debate, decided to change fuel return line restrictor jet, reducing by pass fuel down from 7 to 5 L/hr - certainly helped but did not completely cure. The gold coloured, cube style, boost pump, I have, has no markings -definably not a Facet, could be a Goss, Syntex or some other copy. Will now review Facet offerings with a view to installing a pump of a known Max pressure/volume output.

Thanks for that Kyle. As you may have noted, from earlier posts, my Son has been the brains behind trying to make the Belite system work (against all the evidence that we found On Line). My Sonex is in "the shop" for a range of modifications/tweaks - while in this striped down condition, is the time to make whatever changes might deliver better outcomes - Son advised , about an hour ago, that he doesn't like the odds of the Belite ever being a reliable fuel level reporting system. In the light of this - I have pulled the plug on the system. It will be removed and conventional level sensor/sender installed (suggestions & advice welcome) My thanks to all those who tried to assist in the face of my dogged persistence

RGMWA - Interesting. Thanks for your thought provoking information. The only significant defence would seem to be Max pressure. RV obviously feel that the Rotax recommended Max 4.5 psi, is not up to the job - I wonder why? My fuel system runs at about 5.2 psi, so 7 psi would seem to be a tad over the top. OLD Part Number: 40105 Kit Number: Type: Cube Volts: 12 Max/Min: 4.5 - 3.0 GPH: 30 Fuel Filter Fitting: 1/8 - 27 NPTF Lift Min: 36" Check Valve: N Positive Shut Off Valve: N Internal Fuel Filter: n/a Stainless Steel: N NEW Part Number: 40135 Kit Number: Type: Cube Volts: 12 Max/Min: 7.0 - 4.0 GPH: 32 Fuel Filter Fitting: 1/8 - 27 NPTF Lift Min: 36" Check Valve: N Positive Shut Off Valve: N Internal Fuel Filter: n/a Stainless Steel: N

Apologies the above response should have been to RossK

Very interesting Kyle. Personally I would not have gone down this path but the aircraft ( a near completion home built) came with the (expensive) Belite system so giving it a fair go. As for G loading - not really a problem if the pilot is aware that the system needs to "settle" for an accurate read out - who reads their tank level in a +/- G manoeuvre anyhow? Sight gauge/ tube - agree 100% however the aircraft tank system must be such that this can be installed & seen - I already have some ideas about installing one (using a reversing camera and 100mm screen) - biggest problem will be obtaining the right tubing, so that the fuel level can be readily seen

KG, Good looking pump. One psi higher pressure than Rotax recommended at Max 4.5 psi The integrated/serviceable filter is (for some) a handy feature Not sure how this pump (Gold -Flo) compares with the Facet Cube style of the same/similar pressure/flow rate.etc Facet 478360 pump. PN OEM PN Volts PSI Max-Min GPH Fitting Size Lift Min. Dr 478360 478360E 12 5.5-4.0 36 1/8"-27 Int. 24"

Good effort KG , especially the photos (love seeing other peoples aircraft/fit out) but lacks pump detail - if its a genuine Facet it will have model numbers stamped on to body, in/outlet flange or mounting bracket . FYI - Facet pumps can be ordered as just the pump or a kit. The kit may have additional fittings, such as a filter, possibly push on tube adapters. In my case I will just be getting the pump as my system is all AN aluminium tubing.

Now that's what I would call a first class response/information - thanks Ross

Common guys & girls, almost all small aircraft pilots (particularly Rotax motivated) will be using a Facet or Facet style boost pump (mainly "Cubes") - what model do you have?

Many/most(?) small aircraft fuel tank breathers are configured to deliver positive pressure to the fuel tank(s) Problem 1 Problem 2.The fuel tank is question, is in the fuselage that is subject to pressure changes as a a result of the crew opening/closing fresh air vents & Bernoulli effect. The sensor is responding to the weight of fuel above it RELATIVE to the pressure outside the tank, when it should be RELATING to the pressure inside the tank. So the impact of 1 and/or 2 on the fuel tank level sensor is, either high/low false reading dependent on the relative in tank/ to outside tank pressure.

Hi All, For a 912ULS - please advise which 12V boost pump? you are using and why? I note that: Rotax recommend a boost pump Max pressure of 4.5 psi. It would seem that all Facet pumps, with a Max pressure of up to 4.5 psi, have a 1/8 27NPT In/Out port - this is significantly reduced when an AN fitting is attached - does anyone have a problem with this restriction? and if so what is your solution?

Blue - no offence mate but you seem to be fixated on fuel slop/agitation as somehow being the problem - its not! The problem is the fuel sensor (simply a sensitive pressure sensor very similar to oil/fuel pressure sensor) is being confused by the fuel tanks internal pressure, when the internal pressure differs from ambient (in fuselage in my application). Higher + pressure will read as more fuel Low - pressure will read as less fuel (in fuse pressures may also impact on readings) There are only three potential fixes (aside from capitulation): A second sensor that registers in tank pressure - Possible but very expensive. A single sensor that is connected to in tank pressure - This is the Safiery model. As stated it seem that it may present as an ignition risk. Having in tank pressure the same as ambient (STATIC) - The practicality of this seems unlikely, as routing the tank breather to always/mostly deliver static pressure seems to elude me. The solution's are obvious, finding the parts/components to achieve the fix, less so - hence my questions.

Wow! do you always give up so easily?

Your point being??? As a pilot I would expect you to understand the limits of your aircraft systems - short duration false readings/spikes are accommodated by the systems buffering/smoothing of the read out. Longer term erroneous readings, in this case when sustained above ambient pressure is crated within the tank, from the breather will give a false reading. The majority of sensors register pressure of liquid at one end and atmospheric at the other. To be effective, an aircraft fuel sensor must register liquid at one end and tank internal pressure at the other. I have found one pressure sensor that has its own atmosphere breather tube (rather than a small hole in the "back" of the sensor )https://www.safiery.com/IP67-tank-level-sensor-external-pressure. The Sefiery product looks to have the correct configuration, to sense liquid above and pressure acting on the same liquid. UNFORTUNATLY the breather tube (designed to sense atmospheric pressure) when connected to the tank breather has the potential to deliver an air fuel mixture to the internal electrics of the sensor - this presents to me, as a potential for ignition.

I don't see this as a problem - Cant claim loads of experience however have been inbound /over the top /down wind, when RPT inbound. On each occasion the RPT 's comm's were excellent, with plenty of time for me to make an unhurried decision. If I am not already on base/final, I stay out of his/her way and let them know my position & short term intention (Remain location at altitude). So far the PIC has been very appreciative.

Fuel supply (blockage/empty tank) issues are pilot issues, nothing to do with the engine.

Maaate!! Your comment doesn't address the issue. The problem is not to do with fluid (petrol) agitation, its all about in tank pressure, which you would know if you had any experience with the system OR had bothered to read even some of the information I supplied OR my own comments on the matter. FYI - I am a well aware that technologically older, possibly easier to install/work with, systems are available. If I cant get this one to work as hoped, I will certainly review the alternatives.

Thanks Kyle - I think you will see from my earlier post (repeated below) that the research has/is being done - the cause of the problem pretty well nailed (fluctuating tank pressure) however a cost effective solution (second sensor for tank fuel surface pressure) eludes us. "The following references might just get the attention of the more tech savvy and I hope a recommendation for a second (preferably low cost ) sensor. https://www.radiantinstruments.com/prod ... obe-system https://www.youtube.com/watch?v=9xyC8iw-iGU http://www.sonexbuilders.net/viewtopic.php?f=21&t=2868 https://vansairforce.net/community/show ... p?t=128605 My son (mainly) & I have worked out most if not all of the deductions contained in the above." We think we know what the solution is (a second pressure sensor T'd off the tank breather) BUT not sure of the most cost effective way of achieving this ($263US + delivery from Aircraft Spruce is a tad steep for a sensor )