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HomeAircraftHelicopterHelicopter Main Discussion › Leaky fuel tank confuses me....
09-01-2013 01:39 AM  5 years agoPost 1
McKrackin

rrProfessor

Lucasville,Ohio

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My fuel tank finally split after a few crashes and lots of fuel run through it.

My fault...the stopper tore apart after a crash and I rigged one up that I had to really torque down.

The Avant stopper expands when you tighten it down.
Finally tightened it too much and split the throat.

Anyway...got the new tank installed and it inflated harder than a billiard ball...never have seen it that tight.lol...

Now that the tank is so air tight,the header tank is leaking.

Removed the header tank and it is all leak free.

Took it out and flew it and I had to richen it up a bit.

I would have thought the higher pressure in the tank would mean it would run richer

Anyone know who sells the best header tank made?
Mine is the Quick UK.

I literally never use the word literally right.

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09-01-2013 03:00 AM  5 years agoPost 2
S.Dykes

rrApprentice

Wesley Chapel, FL - USA

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Good question, my quick uk header leaks at the rubber as well.

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09-01-2013 03:03 AM  5 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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I CA glued mine and it held for two years...Just want one I don't have to glue.

I literally never use the word literally right.

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09-01-2013 03:07 AM  5 years agoPost 4
S.Dykes

rrApprentice

Wesley Chapel, FL - USA

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i here ya. It should just work without fiddling or gluing, imo.

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09-01-2013 03:13 AM  5 years agoPost 5
McKrackin

rrProfessor

Lucasville,Ohio

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They need one made like the Avant fuel tank.
No way it can leak unless you break it.lol...

I literally never use the word literally right.

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09-01-2013 03:31 AM  5 years agoPost 6
sonnyhad

rrProfessor

Holland,Mi

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Oh I think I would break it alright, I seem to have a way with that kind of demise!

Bald Pilots usually wear hats!

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09-01-2013 03:32 AM  5 years agoPost 7
McKrackin

rrProfessor

Lucasville,Ohio

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This one from HK looks like it would work...

Any experience?

I literally never use the word literally right.

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09-01-2013 03:37 AM  5 years agoPost 8
unclejane

rrElite Veteran

santa fe, NM, USA

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Not sure you really need a header tank with the HZ-R? It should stay nice and fat all the way through a regular tank even with the fuel level pretty low.

But it will go a hair leaner at the lowest levels. Maybe that's what you saw on yours?

LS

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09-01-2013 03:39 AM  5 years agoPost 9
Einzelganger

rrKey Veteran

Campbell, Texas

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These work great. Several crashes and never any damage.

http://www3.towerhobbies.com/cgi-bi...?&I=LXAGAJ&P=ML

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-01-2013 05:19 AM  5 years agoPost 10
McKrackin

rrProfessor

Lucasville,Ohio

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But it will go a hair leaner at the lowest levels. Maybe that's what you saw on yours?
No...It was lean right off the top when I put in the new fuel tank.
Turned the high out a few and it runs great.

Then it starts to lean out some in the bottom third of the tank....Mainly when traveling with full negative pitch.

Holding it up and turning it over,the clunk seems to hit everywhere in the tank.

Thinking about doing away with the pressure regulator and installing a straight fuel inlet nipple.

I literally never use the word literally right.

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09-01-2013 06:05 AM  5 years agoPost 11
Einzelganger

rrKey Veteran

Campbell, Texas

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McKrackin, unclejane,

I'm trying right now to decide between the OS 105HZ and the HZ-R.
What would you say to the choice. I've always run a header tank and have no urge to give them up. (two extra ounces of fuel and a good indicator of plumbing problems) In your past experience, is the regulator worth the extra money?

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-01-2013 06:21 AM  5 years agoPost 12
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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try using a 2 oz airplane fuel tank as a header tank
I have a 4oz on this model with a bubbless clunk inside

spending time, paying attention

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09-01-2013 06:46 AM  5 years agoPost 13
McKrackin

rrProfessor

Lucasville,Ohio

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I personally don't care much for the regulator.
Did away with it on my 91 HZR and about to do the same on the 105HZR.

Just don't know if I can still use crankcase pressure or if I will have to switch to muffler pressure.

I literally never use the word literally right.

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09-01-2013 06:47 AM  5 years agoPost 14
McKrackin

rrProfessor

Lucasville,Ohio

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Like that set up ICUR12

I literally never use the word literally right.

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09-01-2013 07:14 AM  5 years agoPost 15
ChristianM

rrVeteran

Oslo, Norway

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Anyway...got the new tank installed and it inflated harder than a billiard ball...never have seen it that tight.lol...
Sound like your regulator is strugling a bit with to high pressure. To reduce the pressure you can increase the length of the fuel tubing between the crank case nipple and the check valve. This will reduce the pressure pulses from the crank case.

Christian

Burn fuel, be happy

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09-01-2013 07:17 AM  5 years agoPost 16
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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I call it the bubble trap pro
it is the only size tank opening that is big enough to fit the OS bubbles clunk

the other types of clunks didn't work out as well
they seem to choke themselves shut or fall apart

spending time, paying attention

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09-01-2013 12:24 PM  5 years agoPost 17
unclejane

rrElite Veteran

santa fe, NM, USA

My Posts: All  Forum  Topic

I'm trying right now to decide between the OS 105HZ and the HZ-R.
What would you say to the choice. I've always run a header tank and have no urge to give them up. (two extra ounces of fuel and a good indicator of plumbing problems) In your past experience, is the regulator worth the extra money?
IMO, the HZ-R hands down, but a header tank and traditional carb will work too. The best thing about the regulated version is the consistent running all the way through the tank. I never have to worry about fuel draw problems or fuel level etc. The drawback, tho, is it's a total pain if any debris gets into the regulator. It's not a user-serviceable part so cleaning it out is delicate and may not be successful in the end.

But as long as you use an inline filter and surgery room cleanliness when assembling or servicing the fuel lines (which you should do anyway), it works perfectly and gives no trouble. Literally for the life of the engine you'll never have to touch it.

If you run a header tank, the traditional carb version is probably fine.

But personally I'll never get the traditional carburettor again, because the reg system solves more problems than it introduces.

LS

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09-01-2013 12:28 PM  5 years agoPost 18
unclejane

rrElite Veteran

santa fe, NM, USA

My Posts: All  Forum  Topic

I personally don't care much for the regulator.
Did away with it on my 91 HZR and about to do the same on the 105HZR.
Just don't know if I can still use crankcase pressure or if I will have to switch to muffler pressure.
Switch to muffler pressure definitely. The CC pressure system puts out a LOT of pressure; the tank gets up to something like 5 PSI if I had to make a guess. That'll hugely overwhelm a traditional carb.

Just cap off the tap on the backplate with a piece of fuel line and a stopper and all should be fine.

LS

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09-01-2013 12:35 PM  5 years agoPost 19
unclejane

rrElite Veteran

santa fe, NM, USA

My Posts: All  Forum  Topic

Thinking about doing away with the pressure regulator and installing a straight fuel inlet nipple.
Oh yeah, forgot to mention. The spray bar and in fact all the internal parts in the HZ vs regulated carbs are different. So you can't really just switch out the needle and seat to get rid of the regulator. Unfortunately, you basically have to replace the entire carb.... Don't ask me why I know that lol...

LS

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09-01-2013 01:37 PM  5 years agoPost 20
Scott1115

rrElite Veteran

Greenwich, CT

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Is the carb on the YS56 special? It uses back plate pressure direct to carb with no regulator. Just the check valve between tank and crank case.

Compass 7HV, Trex 550E
RCRCC

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HomeAircraftHelicopterHelicopter Main Discussion › Leaky fuel tank confuses me....
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