damian
Full Niva Petrol Head
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Post by damian on Oct 10, 2012 18:28:11 GMT 2
Hi there,
There is a little metal pipe coming off the carb.. seems to leak petrol when one presses the accelerator when the engine isn't on. I assume this is an overflow pipe of sorts which should surely be connected to something to recirculate said petrol?
Mine is just leaking petrol into the engine compartment.. Which is surely not the best? lol
Any ideas?
Cheers,
D
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spikes
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Post by spikes on Oct 10, 2012 19:18:50 GMT 2
Can you post pics. It might help the carb model owners. But some thing is wrong.
It is either the return flow pipe or the needle and seat in the carb bowl is very worn
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spikes
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Post by spikes on Oct 10, 2012 19:31:00 GMT 2
Mostly likely the pipe from the back of the carb running back to fuel tank Attachments:
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damian
Full Niva Petrol Head
Posts: 193
Registered: Aug 25, 2012 22:12:34 GMT 2
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Post by damian on Oct 10, 2012 19:48:05 GMT 2
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Post by Charles on Oct 10, 2012 20:22:28 GMT 2
No idea. Just plug it.
Charles
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Post by ronnie on Oct 10, 2012 22:16:03 GMT 2
Hi Damian
You have nothing to worry about. The pipe you mention is the drain pipe from the bottom of the manifold which drains excess petrol from the manifold to avoid flooding. It was very common on old design cars. When you press the accelerator when the engine is not running you squirt petrol into the manifold from the pump piston and this is the petrol you see. Do not press the accelerator with the engine stationary. Ari commented on this same pipe in a previous post. He was worried about unfiltered air entering the motor via this pipe. However the amount of air drawn in here is tiny.
Ronnie
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damian
Full Niva Petrol Head
Posts: 193
Registered: Aug 25, 2012 22:12:34 GMT 2
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Post by damian on Oct 10, 2012 22:39:22 GMT 2
Ah ok, I thought this was the case.. Figured it was best to ask to be safe. Thanks all! D
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Post by Charles on Oct 10, 2012 22:48:19 GMT 2
So just plug it.
Charles
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Post by ronnie on Oct 10, 2012 22:58:54 GMT 2
Hi Charles
You could plug it but then it will not function as it was designed to and if you do pump the accelerator without the engine running you can end up flooding it.
Ronnie
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Post by Charles on Oct 10, 2012 23:02:25 GMT 2
Then he should just not do that. ;D ;D ;D
Charles
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Post by ronnie on Oct 10, 2012 23:21:56 GMT 2
Hi Charles
Glad to see you are back to your old self ;D ;D ;D
Ronnie
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Post by Ari Bezuidenhout on Oct 11, 2012 9:06:03 GMT 2
And what about any dust that gets sucked in there?
Ari
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Post by ronnie on Oct 11, 2012 9:23:19 GMT 2
Hi Ari
The hole in the pipe is tiny so there should be no issue here. That type of drain is very widespread in old design of cars. You could re post the mod you did to yours that still allows petrol to drain when the motor is stopped but seals the pipe when running.
Ronnie
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Post by Ari Bezuidenhout on Oct 11, 2012 10:10:38 GMT 2
I am surprised that you remember that mod, Ronnie. It was not as successful as I hoped. The plastic valve I used got eaten up by the petrol.
Ari
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spikes
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Post by spikes on Oct 11, 2012 11:32:38 GMT 2
Why not connect it with a y or t piece into the return flow pipe? Or does the pipe have to breathe to regulate fuel level in the carb?
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Post by ronnie on Oct 11, 2012 11:35:45 GMT 2
Hi Ari
Was it petrol or perhaps heat which devoured the mod ?. The delivery of vacuum is different depending on where the take off point is ? I think this is correct. If so I would expect where the drain pipe is once the motor is pulling there will be no vacuum at the pipe and no dust can then enter.
Ronnie
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Post by ronnie on Oct 11, 2012 11:40:26 GMT 2
Hi Spikes
You would not be able to do that as the pipe concerned is not in any way connected to the carb. You would then have the return to tank pipe open to atmosphere. The pipe is situated at the bottom of the inlet manifold. yours being injected it may not have this.
Ronnie
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spikes
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Post by spikes on Oct 11, 2012 11:42:36 GMT 2
Oh Ok thanks Ronnie
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