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Restoration & Repair Tips Board

leaky fuel line

Author  [Modern View]
rich o

07-02-2012 12:18:49
66.220.233.8



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, i have a stubborn leak in two different connections in my fuel system. both in lines coming from the filters, they seem to be thghtened all the way down, possibly leaking from the line were the compression nut goes over. is there a seal or compound that may cure these stubborn leaks? thanks for any advise




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rich o

07-03-2012 17:55:02
66.220.233.8



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 Re: leaky fuel line in reply to rich o, 07-02-2012 12:18:49  
i checked for cracks ,did not see any, it has a ferrole before the flare, it seeme maybe the ferrole has been compressed maybe to many times. i dont have much extra line but may be able to pull a bit from a small verticle drop the line takes off the injector pump. what type of tool will flare the end, is it the same as the one used in copper tubing for plumbing?



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greygoat

07-03-2012 06:11:41
184.158.75.173



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 Re: leaky fuel line in reply to rich o, 07-02-2012 12:18:49  
If you've got "Compression" type fitting, where there's a little bulb on the end of the tube...
after a number of times being tightened, they
may not seal good anymore. The cure? They can't
be remove and replaced...you'll have to cut them
off, just before the "bulb" and install new ones,
IF THERE'S ENOUGH LINE...and.. there is some
"Rule" about tightening compression fittings..
hand tight, then 1-1/2 turns or so.
If you've got flare fittings..look for a crack!

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JRSutton

07-06-2012 10:25:19
75.130.109.233



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 Re: leaky fuel line in reply to greygoat, 07-03-2012 06:11:41  
yeah - I find they usually go bad not so much from re-use but from over tightening.

It's very tempting to crank them down more than nescessary. Once they're deformed, it's a downward spiral.

They drip a little - so you tighten them more - which distorts them more - which makes you tighten them more...



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jackinok

07-02-2012 12:27:26
162.58.82.136



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 Re: leaky fuel line in reply to rich o, 07-02-2012 12:18:49  
if you can get them apart,look very carefully for a crack on the flared end. You may even find it with a fingernail or knife blade. if its cracked its very hard to seal,about the only luck ive had is redoing the double flair. what happens is even though its really hard to see,when you tighten it it spreads apart.



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