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leaking fuel tank

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Robert Bromwich12/07/2008 11:44:00
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Hi all

Hopefully someone can help i purchased a se5a from this years weston park show and as i only fly electric thought i would try my first  ic engine plane which i have got running great the only problem i have is the fuel tank is leaking from the pipes i think!?! could be from screw in centre not sure

As i was going to the woodspring 2008 show and asked someone there the first thing they said was that most ARTF planes come with silver pipes and not brass ones for the tanks so i have changed them to brass but it is still leaking (but not as much now) as this is my first ic plane could anyone out there help me

thanks for any help

rob

simon barr12/07/2008 11:54:00
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1032 forum posts
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Hello Rob,

It could be that the rubber bung is starting to perish. For the price they are, you are better off getting yourself a new tank and fuel tubing and re-plumbing the whole lot.

All the best.

Robert Bromwich12/07/2008 12:14:00
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182 forum posts
19 photos

hi simon

Not saying its not the rubber bung but have only had 9 tanks thought it should have gone already ?and has leaked from start (screw in centre is very tight ) but more then likely will get new tank as of to LMA Cosford next weekend .

can you get one already fitted together i.e just connect the fuel etc pipes to it?

rob

simon barr12/07/2008 13:47:00
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1032 forum posts
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Hello Rob,

I doubt if you can find a tank already assembled, but the SLEC tanks only need the feed fitting as the two other outlets are moulded in, and the feed just screws in with an O ring, nice and simple

Eric Bray12/07/2008 15:11:00
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6600 forum posts
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I've had brand-new leaky tanks before, myself. All it needs is a tiny 'bead' of raised material making a thread from the inside to outside, in the neck, or a 'feather' of moulding flash on the rubber bung, and you have a leak.

You say the screw is tight, but what does it screw into/onto? Is the tightening screw itself leaking through the hole? Is it pulling a hard plastic disc at the back of the bung forwards, to meet a hard plastic disc at the front, thus squeezing the rubber bung, making it expand in the neck of the bottle? Is the bung the right size?

Has it been screwed in TOO tightly, and split the tank neck? Have you emery-papered the ends of the metal fuel  pipes, to ensure there are no little burrs on them that have cut the fuel tubing?

Robert Bromwich12/07/2008 15:14:00
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182 forum posts
19 photos

Thanks simon

Just looked at the SLEC tanks think they will fit great as they are square as well

Another question you or someone might help me with

I Have a 0.40 engine and its a 6oz tank what sort of flight times should i be getting about( i know it depents on throttle) but just approx would do, at the moment getting 8 mins which i think is very short of course the tank is leaking so hopefully should get a few minutes back but i thought about 15 mins would be about right ?

thanks rob

Robert Bromwich12/07/2008 15:28:00
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182 forum posts
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hi Eric

was just writing reply and you got there first

The screw screws into a metal disc on the back on the bung , everything came with the tank so all i can say is it should fit ,bung is tight to get in before you screw it up, screw thread is ok and i have sanded the pipe ends, i have changed tubing again when i changed the pipes from silver to brass. when i was changing pipes i checked the tank etc to make sure everything was ok before i fitted everything back together all seemed fine.

one thing i didnt check is the (Tiny 'bead' of raised material making a thread from the inside to outside, in the neck, or a 'feather' of moulding flash on the rubber bung, and you have a leak) so i guess it would be that ?

will have a look at that if not i think a new tank it is

many thanks rob

simon barr12/07/2008 15:38:00
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1032 forum posts
16 photos

Hi Rob,

A 6oz probably won't give you more than about 8 min., the usual size tank for a 40 would be around 8oz.

The SLEC yellow top tank is 9oz and gives a good 10 min or so on my 46, probably more if I fly till it runs dry, to be honest, I've never really timed it, there is just ample

Robert Bromwich12/07/2008 16:40:00
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182 forum posts
19 photos

Thanks again Simon

Thats good to know, so it cant be leaking to much, but still to much

many thanks rob

Eric Bray13/07/2008 16:34:00
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6600 forum posts
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A silly thought!! I met a similar problem once, where the front of the model was always sopping wet after a flight, but it never leaked a drop on the ground. That took some head-scratching. We finally found it while running the engine flat out with the model attached to a tether. Someone noticed that fuel was being sucked, by venturi action, out of the top of the carb, and thrown back by the prop-wash! throttle down a little, and it stopped! We cured it by plugging an r/c car air filter into the top of the carb, therefore altering the height of the entry lip!
Robert Bromwich13/07/2008 18:03:00
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182 forum posts
19 photos

Thanks Eric and Simon

As im off to LMA Cosford next weekend(Saturday) i think a new slec 9oz tank is another addition to my list  will just have to hide it from girlfriend  ,hopefully this will then solve the problem.

many thanks to you all i will update you when i get chance to test the new tank out

rob

simon barr13/07/2008 18:11:00
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1032 forum posts
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Crickey! you must be under the thumb if you have to hide a £3 fuel tank from the missus
Robert Bromwich13/07/2008 19:40:00
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182 forum posts
19 photos

Hi Simon

Could get away if it was just that but list is nearly a page long  (a week to go yet), dont think i would getaway with that ?if she saw that page

Rob

Eric Bray13/07/2008 20:45:00
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6600 forum posts
2 photos
A4 or foolscap?
Robert Bromwich13/07/2008 21:08:00
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182 forum posts
19 photos

No line feed paper  on office printer not home one!

dont think i could fit it on A4 size

If your going to cosford look for the guy with lots of paper ,and then nextday with bruises

going abit of topic but many thanks for your help

rob

simon barr14/07/2008 20:24:00
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1032 forum posts
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Good Luck !
Eric Bray15/07/2008 12:21:00
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6600 forum posts
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Ah, a ream of fan-fold. Ok!
Robert Bromwich22/07/2008 22:30:00
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182 forum posts
19 photos

Well went to Cosford on saturday abit windy and showers on and of but all in all a good day

Got my fuel tank the 9oz Slec ,but could you believe it i never thought to check it fully (i did make sure everything was there) but one of the parts in the packet was wrong

when i looked at it i had the clunk and the fuel line and the screw in fuel nipple but no nipple was on the outside so nothing to connect the line to the engine!

http://www.modelflying.co.uk/sites/3/images/member_albums/29507/DSCF2389.jpg



So after all that i still cant change the tank over

Did ok with the other items though and got a great charger the Max Loong E6 from the Budget RC tent ,so not to bad of a day

Rob

Eric Bray22/07/2008 22:54:00
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6600 forum posts
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That's one tank that cannot leak!!!
Robert Bromwich23/07/2008 06:05:00
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182 forum posts
19 photos

Thats very true never thought of it that way

One good thing is i emailed Slec yesterday and i got a reply they are sending me the item out in the post so everything has worked out ok in the end

Thanks for all your help

Rob

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