thebutler
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| posted on 17/8/03 at 08:39 AM |
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Inlet manifold fuel leak
Hi,
I've just attached my twin 40's to my crossflow inlet manifold, using new misab sandwich plates and the rubber mounting bush kit. However
when I run the engine I get a constant drip of fuel leaking from between the 40's and the manifold. Both surfaces appear to be true, so is this
a common problem?
It's a bit worrying as it's dripping all over the dizzy!
Any advice appreciated,
Steve
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Stu16v
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| posted on 18/8/03 at 08:50 PM |
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Could be a couple of things....
It sounds like there could be a leak at the join of carbs/manifold. What tightening procedure did you use for your carbs? There needs to be movement
at the carbs, but not at the expense of air leaks....
BUT, it sounds like you also have a carb that is possibly flooding, because raw fuel shouldnt be dripping from there in the first place. Are they
brand new-or second hand?
Cheers, Stu.
Dont just build it.....make it!
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Rob Lane
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| posted on 19/8/03 at 08:38 AM |
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Is it travelling down outside of carbs or coming from sandwich plate?
I would suspect a float needing setting up.
There's also sometimes the problem of standing fuel in inlet when carbs are not setup properly, this due to too rich a mixture condensing on
wall and trying to find a way out.
Usually end of trumpet inlet or from 'O' rings when vibration causes them to part slightly due to lumpy running.
It's worse when ignition and cams are messed with. It's entirely possible to watch the standing wave take the fuel down the inlet as the
revs are slowly built up.
That's when a rolling road setup is worthwhile.
I shouldn't worry too much, it's more likely a stuck float valve causing flooding.
Did the carbs come from a Xflow that was a similar setup? have they been jetted?
Rob Lane
[Edited on 19/8/03 by Rob Lane]
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thebutler
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| posted on 19/8/03 at 10:07 AM |
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Correction - the fuel doesn't leak when the engine is running, only after it is stopped.
From what you've said, this leads me to believe it is due to a sticking needle valve or incorrect float valve height. I'll get this
checked out.
Thanks for the tips...
Steve
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