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HelicopterMain Discussion › SUCKING AIR FROM TANK!!!!!!!
01-17-2011 12:40 AM  7 years agoPost 1
Mykey heli

rrNovice

QUARTZ HILL, CA.

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the past three days my raptor 30 with tt.39 eng. has been pulling air from the tank. i have replaced the tank and all the lines 3 times, in addition i replaced the muffler. when the tank is full it starts immediately but after landing and spooling down it will not start due to all the air in the lines, basically there is virtually no fuel and the tank still has about half.
sure due need some assistance with this one. thank you

YESTERDAY IS GONE AND TOMORROW HAS NOT YET ARRIVED..NOW IS ALL THERE IS...GO FLY...

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01-17-2011 12:51 AM  7 years agoPost 2
helismash

rrKey Veteran

Gloversville, NY - Fulton

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Try the needle valve. Loose head maybe? I sure would be interested to hear how you fix it.

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL

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01-17-2011 12:54 AM  7 years agoPost 3
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Maybe the carb is not all the way in or loose.

Team Synergy, Rail blades, Team Scorpion, V-Team

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01-17-2011 02:07 AM  7 years agoPost 4
thtoyman

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Gone ,Flying.

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are you have a header tank?

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01-17-2011 03:11 AM  7 years agoPost 5
FILE IFR

rrApprentice

Anytown, USA 01234

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Maybe the carb is not all the way in or loose.
That would make it run lean.

I'd say it's the wrong sized tubing and/or the tubing is not tied with SS wire.. causing it to pull air.

...Does the header tank drain first before the main tank??

Futaba.. Always Imitated, Never Duplicated.

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01-17-2011 08:10 AM  7 years agoPost 6
jbiter

rrKey Veteran

Sebring, FL

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When the heli is being hovered, can you see any foaming of the fuel in the tank?

Jeff

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01-17-2011 09:13 AM  7 years agoPost 7
siang

rrApprentice

auckland, new zealand

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I think there is this anti foam clunk. I had this problem on my plank.

welcome to the dark side =)

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01-17-2011 10:40 AM  7 years agoPost 8
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi

Try blocking the lines with 3 mm bolts and blow on one. This will check if the tank is holding pressure of there is a hole in the tank. Seeing the bubble come at 1/2 tank. There is probably a leak in the rubber stopper. If not... Continue.

The 1/2 tank thing suggests a hole in the klunk line or plastic tank fitting. Try change them.

Let us know how it goes.

Regards
Paul

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01-17-2011 10:48 AM  7 years agoPost 9
thtoyman

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Gone ,Flying.

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Does the header tank drain first before the main tank??

no
hard tank should stay full till the main gone

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01-17-2011 02:14 PM  7 years agoPost 10
Mykey heli

rrNovice

QUARTZ HILL, CA.

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i do not have a header tank. and i have tried all of your suggestions. one thing though i recently stripped out the glow plug threading in the head and installed new one, but at that point it ran great. new tanks x3 and new line i am using sulivan fuel line on all my heli's no problems with any of them. also i did not see a gasket on the head when i removed it is there supposed to be one! thanks again for your help.

YESTERDAY IS GONE AND TOMORROW HAS NOT YET ARRIVED..NOW IS ALL THERE IS...GO FLY...

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01-17-2011 02:22 PM  7 years agoPost 11
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi

Can you drain the tank with your fuel pump without getting any bubbles?

Paul

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01-17-2011 03:14 PM  7 years agoPost 12
koppter

rrApprentice

Virginia

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just a thought, but from my airplane days that's a sign that your clunk line either has a hole, is torn (common) or is not connected to the fuel pick up line. pwood has it right - and i am betting that you cannot drain your tank for the same reason.

tubing size isn't going to make any difference on that size motor - unless it is loose on the brass pick up.

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01-17-2011 06:07 PM  7 years agoPost 13
chicagoslick

rrApprentice

Indiana, USA

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Sounds like your brass or aluminum tubes entering the tank are leaking through the rubber stopper. I have had this happen many times on airplanes in the past. By the way I would add a header tank as your supply to the carburator / motor. This will help stabalize your fuel supply going to the motor plus give a little bit of additional flying time.

Chicagoslick

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01-17-2011 06:18 PM  7 years agoPost 14
Mykey heli

rrNovice

QUARTZ HILL, CA.

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i can drain the tank with out getting bubbles with my pump, also there is no foaming in the tank when hoovering. could the engine be at fault? thanks

YESTERDAY IS GONE AND TOMORROW HAS NOT YET ARRIVED..NOW IS ALL THERE IS...GO FLY...

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01-17-2011 07:44 PM  7 years agoPost 15
JuanRodriguez

rrProfessor

The Villages, Florida

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i can drain the tank with out getting bubbles with my pump, also there is no foaming in the tank when hoovering. could the engine be at fault? thanks
Then your problem has to be with the motor....

Your comment about the "stripped glo plug" is interesting...... I wager to guess that this is your problem..... it's not the "glo plug" that you stripped as the glo plug body is steel...... you stripped the aluminum threads in the head !

There is where your "leak" is coming from....

In order for you to draw fuel properly, your compression must be good.... The compression is probably good when you first start the motor, that's why it "seems" to run great....

But, as the motor warms up, the stripped head is probably leaking around the glo plug thread...

Change the head or have a helicoil insert installed and that will probably solve your problem....

You stripping the threads in the head and your tuning problems now is not a "coincidence".....

Been there, done that and old enough to know better.....

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01-17-2011 07:55 PM  7 years agoPost 16
Mykey heli

rrNovice

QUARTZ HILL, CA.

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thanks for the reply, but i installed a new head...

YESTERDAY IS GONE AND TOMORROW HAS NOT YET ARRIVED..NOW IS ALL THERE IS...GO FLY...

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01-17-2011 08:17 PM  7 years agoPost 17
JuanRodriguez

rrProfessor

The Villages, Florida

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Hummmm

Not sure if you've already covered this but did you re-torque the head bolts since you installed the new head ??

Loose head bolts will give you the same result as the stripped threads....

Also, a stuck or worn ring will give you the same thing..... you need good compression to draw the fuel properly whether the motor is warm or cold....

What is the status of your sleeve ?? Any scoring ?? Anything that affects compression will effect fuel draw..."muffler pressure" alone is not enough to overcome compression problems....

Been there, done that and old enough to know better.....

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01-17-2011 08:24 PM  7 years agoPost 18
Mykey heli

rrNovice

QUARTZ HILL, CA.

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just pulled the engine to recheck everything...thanks

YESTERDAY IS GONE AND TOMORROW HAS NOT YET ARRIVED..NOW IS ALL THERE IS...GO FLY...

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01-17-2011 08:40 PM  7 years agoPost 19
AA simon

rrApprentice

barcelos, portugal

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not sure about your engine but on a friends os 50 hyper i seem to remember there being a thin copper like gasket that seved as a head gasket may be worth a check.

i may also be completly wrong, please check

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01-17-2011 09:09 PM  7 years agoPost 20
flyen_3d

rrNovice

BIRMINGHAM, ALABAMA

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???

There has to be a small hole in the pick up line or the tubing going from the tank to the carb. If they were all in good shape and your clunk is submerged in fule there would be no way for air to get in the line.

Try taking the entire tank/clunk assembly out including the penitration at the tank, removing the line from the carb so you have the entire length of tubing as it was installed on the heli (from teh carb to the clunk. Remove the clunk, cover or pinch the end with your finger and blow or suck. I'm sure you will find the bad spot.

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HelicopterMain Discussion › SUCKING AIR FROM TANK!!!!!!!
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