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HomeAircraftHelicopterHelicopter Main Discussion › Sab fuel magnet
09-14-2018 06:20 PM  10 days agoPost 1
datidun

rrElite Veteran

N Ireland

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I wanted to try a fuel magnet for the first time so taken the header tank off, I filled up the main tank and started to drain as the fuel level touches the top of the magnet it sucks in loads of air, not sure I want to use it,is this normal?, using its on a Trex 600, it gonna run lean at quarter tank thats for sure.

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09-14-2018 07:02 PM  10 days agoPost 2
RM3

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Killeen, Texas - USA

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no not normal... check that you dont have a broken/cracked fuel fitting, cracked or broken fuel line (metal and plastic) or loose fuel line to fitting connections. last time an individual had a similar problem, the metal fuel line inside the fuel stopper to the tank was cracked inside the fuel stopper itself...

with nitros, the header tank serves as a reservoir so an empty header tank is a sign you have an air leak between the main tank and the bubbles being sucked in are accumulating in the header tank.

showing a preference will only get you into trouble, 90% of everything is crap...

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09-14-2018 08:20 PM  10 days agoPost 3
datidun

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N Ireland

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The Header tank is off, this is main tank only, new tubing works fine with standard and OS clunk, its the Sab magnet, cant see the point in using it.

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09-14-2018 08:21 PM  10 days agoPost 4
RM3

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Killeen, Texas - USA

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datidun
cant see the point in using it.
well it seems you answered your own question... its not working for you... so its either defective or inadequate for your fuel needs.

showing a preference will only get you into trouble, 90% of everything is crap...

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09-14-2018 10:08 PM  10 days agoPost 5
ICUR1-2

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Ottawa, Ontario

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O.S. makes a bubbless clunk use that instead.
I use both, the header plus clunk to get the most flight time.

spending time, paying attention

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09-14-2018 10:40 PM  10 days agoPost 6
datidun

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N Ireland

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I have that set up, OS and the header, I wanted to try without the header tank.

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09-15-2018 01:09 AM  10 days agoPost 7
ICUR1-2

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Ottawa, Ontario

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Giver a try. Just don't wait until it leans out to land

spending time, paying attention

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09-15-2018 08:44 AM  9 days agoPost 8
datidun

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N Ireland

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It will lean out at quarter tank which is just level with the magnet, thats on a Trex 600 tank proven it on the bench by slowly draining the fuel,this was made for the 700 nitro much bigger tank, looks like the header is going back on.

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09-15-2018 11:01 AM  9 days agoPost 9
datidun

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N Ireland

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Does the word pressurised ring a bell?

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09-15-2018 12:28 PM  9 days agoPost 10
ICUR1-2

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Ottawa, Ontario

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Pressurized tanks are for regulated engines..

spending time, paying attention

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09-15-2018 06:56 PM  9 days agoPost 11
datidun

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N Ireland

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I believe its not, as pressure is pressure, once the tank is pressurised the bubbles should dissapear.

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09-15-2018 07:19 PM  9 days agoPost 12
RappyTappy

rrProfessor

Traveling the USA

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09-15-2018 08:37 PM  9 days agoPost 13
Eury

rrProfessor

Dover NH

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You are seeing bubbles because your pump is drawing fuel much quicker than the clunk can deliver so you get bubbles. Your engine won’t draw at anywhere near that rate. Fly it and see, I’d bet you find it runs consistently to the last drop. That’s how mine is.

Nick Crego

Citizen #0168

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09-15-2018 08:39 PM  9 days agoPost 14
Eury

rrProfessor

Dover NH

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ICUR1-2
Pressurized tanks are for regulated engines..
All heli tanks are pressurized. Either from muffler pressure or backplate and regulator. One is just higher pressure than the other.

Nick Crego

Citizen #0168

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09-15-2018 08:51 PM  9 days agoPost 15
datidun

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N Ireland

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Thank you Eury.

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09-15-2018 09:35 PM  9 days agoPost 16
utahbob

rrVeteran

St. George Utah

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Just my opinion..from experience; putting anything in your fuel tank that can deteriorate and break up into tiny pcs. is counterproductive to keeping an engine running!..I've had great success with the O.S. clunk.

I do a great decending funnel!

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09-15-2018 11:19 PM  9 days agoPost 17
ICUR1-2

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Ottawa, Ontario

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Eury
ICUR1-2
Pressurized tanks are for regulated engines..
All heli tanks are pressurized. Either from muffler pressure or backplate and regulator. One is just higher pressure than the other.
Yes but when the engine is not running a regulated engine retains pressure in the tank, there's a big difference.

spending time, paying attention

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09-16-2018 02:37 AM  9 days agoPost 18
Jerry K

rrKey Veteran

Houston Area

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What difference does that make? The engine is not drawing fuel, when it is not running.

OP you went to all the trouble to modify your fuel system and install the clunk, then you are not even going to try it. I had the original fuel magnet in 2 of my helis, and never had a problem then after about 8 years both began coming apart at the same time. Both were changed out with the SAB design and have flown just as well. If I want I can drain every drop out. In fact I have auto'd in and the tank was completely empty. When it runs out of fuel, it is going to go lean but it is the same with any clunk. There is NO need in a hopper tank and if you need to fly that long never consider an electric, you will be extremely disappointed.

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09-16-2018 03:29 PM  8 days agoPost 19
wjvail

rrKey Veteran

Meridian, Mississippi

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A few thoughts...

Some time ago I made a concerted effort to simplify my fuel systems. To that end I went back and removed the header tanks from all my YS and OS/DRS engines. With the pressures these fuel systems run at there is no need for a "bubble trap". I don't like the idea of virtually doubling the fuel system plumbing with so little gain. Yes a few of my older models still have header tanks. I've left them installed in part simply because a Raptor 30 or X-Cell SE always had one and it is period-correct to keep a header tanks installed. The last time I flew one of my models that included a header tank the mounting bracket broke and I landed with the 2oz tank hanging from its pluming. Day over for that model. It's just a lot more to go wrong.

At the same time I removed the header tanks, went back and verified I had installed OS bubbleless clunks in all my models. I found that these don't restrict flow, promote an air-free fuel supply, and allow all the fuel in a tank to be consumed. They are expensive but I find they work well. The O-ring will break. I don't care.

I made a commitment to never install any component in my fuel system that I know will eventually deteriorate and cause damage. I'm thinking of fuel magnets here. I will not install any component that I know, if left un-maintained, will cause the destruction of my engine, model or both.

A thread on the subject of fuel magnets:
https://rc.runryder.com/t662675p1/

"Well, Nothing bad can happen now."

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09-16-2018 03:56 PM  8 days agoPost 20
Jim-bob

rrApprentice

Little Hocking OH USA

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I ran the OMI fuel magnets for years without issues. I know others had problems with them. Unfortunately they don't seem to be available anymore so I switched to the sab type. They work just fine. As posted above you can get air with your hand pump but in normal operation this won't happen. As mentioned the OS clunk is also another great product.

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HomeAircraftHelicopterHelicopter Main Discussion › Sab fuel magnet
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