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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › 700N + YS 91 SR = Leaking pressure nipple?
04-23-2009 05:40 AM  10 years ago
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Anthony.L

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Seattle, WA

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700N + YS 91 SR = Leaking pressure nipple?
I'm wondering if I have a defective tank, or other people have experienced the same thing.

Just fired up the 700N tonight for the first time, and while idling I immediately noticed lots of small air bubbles and fuel leaking around the pressure nipple on the top of the tank. This is a YS 91 SR, with crankcase pressure of course. I have the check valve installed, proper length from the crankcase and correct direction.

So, defective tank? bad fuel hose? I can't tell, but it's leaking pretty bad.
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04-23-2009 05:42 AM  10 years ago
george0079

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USA

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Change out the fuel line.... If it still leaks, then the problem is something else. Probably the tankHell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!
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04-23-2009 05:45 AM  10 years ago
Quandumphone

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Yuma, AZ

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Might have a cracked tank where the nipple is. It shouldn't leak there but if the tubing connection isn't tight, it might leak. Most, if not all, of the 700 leaks have been at the blank stopper on the face of the tank.
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04-23-2009 05:49 AM  10 years ago
Anthony.L

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Seattle, WA

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Didn't note because it's not related, but last night I attempted to start the motor and when just performing the crank over to build tank pressure the blank stopper in the tank started puking fuel out.

So I epoxied the blank stopper on the tank and today it's no longer leaking. That's when I found the leak around the pressure nipple once it started up.

This YS builds some serious pressure in the tank!
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04-23-2009 05:49 AM  10 years ago
Anthony.L

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Seattle, WA

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Change out the fuel line.... If it still leaks, then the problem is something else. Probably the tank
I'll try that and report back, easy check.
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04-23-2009 07:09 AM  10 years ago
Saint728

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Honolulu, Hawaii

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I would change the tank out. If you fly it the way it is now with the epoxy and it starts to leak while you are flying it could lean out and damage your motor.

Take Care,
Cheers, Patrick
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04-23-2009 04:06 PM  10 years ago
majestic12

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Avon, CO

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So I epoxied the blank stopper on the tank and today it's no longer leaking. That's when I found the leak around the pressure nipple once it started up.
better fix would be to take a note from our planker friends on how they fix stoppers into fuel tanks. I had a leak as well until I did the following fix to compress the stopper in to place.

Just get two nice size washers from your parts bin a nylock nut and a 3mm bolt as long as the stopper is thick. You want to drill a hole through the stopper then install bolt/washer on the outside and then washer/nut on the inside. Tighten it up little by little until you can just barely get it back in the tank. Once in the tank it should be tight enough that you can tighten the bolt a tinny bit more to further compress the stopper. This did the trick for me and it will not ever leak on you again.

TREX 700N Flybarless
HF:STMPNGRND
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04-23-2009 04:10 PM  10 years ago
cdrking

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Seattle

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Is Align working on a new tank with just one hole? I thought I heard/read that somewhere.

Definitely don't fly it until it's fixed. As stated above the YS doesn't like leaks.

Jeff
To hover is divine, the alternative is rather PLANE.
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04-23-2009 04:15 PM  10 years ago
Anthony.L

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Seattle, WA

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I wish they would, but then my luck they would make it with the center hole only, and get rid of the outer.

Mine for all intents and purposes is single hole now, the center plug is very well epoxied and not going to leak. Now if I can fix the leak around the fuel tubing...

I'm going to pick up a new tank and hope that fixes it.
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04-23-2009 04:40 PM  10 years ago
devious17

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Malaysia

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This is a known problem with the 700, I had the same problem on my 600 when I installed the YS50ST. The remedy? plumbing tape around the platic piece and reinstall into the gromet, it hasnt leaked ever since.
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04-23-2009 04:44 PM  10 years ago
alawel

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Springfield Oregon

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YS preasure
You might try cutting a small piece of fuel tube and stretching it over the end of the fuel tube that attaches to the tank. The extra piece won't be much bigger than an O-ring and you can stretch it open with a small pair of needle nose pliers.

The new tank might be needed though. I have seen fuel tanks with small holes around the preasure nipple. If that's the case, doubling the fuel line won't help.

Alan
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04-23-2009 08:52 PM  10 years ago
Anthony.L

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Seattle, WA

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I tried the doubling the fuel line and it cut down a lot of the leaking, but still leaked a little. I'm going to try some plumbing tape, I guess you guys mean Teflon pipe tape? If that doesn't work, putting a brand new tank in it.

I'm regretting this YS 91 SR and don't even have it in the air, I'm lazy and the OS suits me better.
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04-23-2009 09:12 PM  10 years ago
baddynergy

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sierra madre, ca- usa

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I'm regretting this YS 91 SR and don't even have it in the air,
Dont regret it, its a GREAT engine. once you get it broken in you wont touch a needle again.
**Unattended children will be givin a shot of espresso and a puppy**
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04-23-2009 09:30 PM  10 years ago
alawel

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Springfield Oregon

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I think you'll dig the YS once the leak is found and cured. Just don't forget to let the pressure out of the tank before disconnecting the fuel line.
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04-23-2009 09:34 PM  10 years ago
Anthony.L

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Seattle, WA

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Just don't forget to let the pressure out of the tank before disconnecting the fuel line.
Oh yeah, not my first YS, I have a 50ST in the 600N and Vibe 50. I learned that mistake the hard way!

FYI, neither of those leaked like this 91SR in the 700N.
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04-23-2009 11:59 PM  10 years ago
Anthony.L

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Seattle, WA

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Ok, for the record, it's fixed. So the good news is the tank does not have a leak. I was this close to paying $14 for another, so no loss there.

devious17 suggested plumbers tape, and this fixed it! I wrapped a couple layers of Teflon PTFE tape around the pressure nipple molded on the fuel tank. Then installed the fuel line with a small piece of fuel tubing doubled up as an oring/clamp. Just fired up the heli in the garage and zero leaks, holds pressure great.

Thanks everyone for the help, hope this helps others in the future with a similar problem.

Teflon tape just found a new home in my field bag.
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04-24-2009 03:44 AM  10 years ago
devious17

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Malaysia

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I am happy that you are happy =D I used the plumbing tape on the main tank and also on my header tank, no leaks whatsoever.

I have given the same suggestion before but I was criticized that the nitro would erode the tape.

The funny thing was they didnt even give it a try before giving their opinion.
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04-24-2009 03:49 AM  10 years ago
lfalsetto

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COLORADO

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Take a small tie wrap and put it on the fuel line, I do this on all fuel fittings when I use YS
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04-24-2009 01:34 PM  10 years ago
Carey

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Allentown USA

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I run ys motors in my 50 and 90. For the both of them I pop out the fuel system (tank, hoses, filter/T fittings), pressurize it to 15-20 psi, plug it off and stick it in a bucket of water.

No bubbles coming out of the tank or T fittings, I am good to go!
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04-24-2009 10:34 PM  10 years ago
Anthony.L

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Seattle, WA

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Take a small tie wrap and put it on the fuel line, I do this on all fuel fittings when I use YS
I had a bad experience with zip tie and cutting through the fuel tubing causing a forced auto. Now granted that was with Hayes clunk tubing which is softer, it still left a bad taste in my mouth about fuel tube and zip ties.

The double up fuel tube and teflon tape is doing the job for now.
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