Lancia Beta Forum
Technical stuff => Fuel System Carb => Topic started by: cheeky monkey on June 19, 2010, 05:09:50 PM
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I thought id replace the fuel hoses for the inlet and outlet to to the carb (weber 32 DAT) as they were looking poor and evidence of a little fuel at the top where it joins the carb. Having put new hoses in its got worse, so i tried a lower bore size & different type of clips i still get petrol coming from at least the inlet but its hard to tell. putting the original pipes back on the prob is worse than it was originally. There doesnt seem to be any damage to the pipes coming out the carb themselves - or is it possible to get a hairline crack in these do you know.?
Ive used a mirror to check around the area and its not coming from any gasket - they were changed recently and look fine.
any ideas appreciated
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I test pipes by removing them and then blanking off one end and connect the other end to my compressor, then drop the pipe into a bucket of water and fire air through the pipe - leaks should be obvious.
Always use the same bore puipes if you can when replacing.
If the pipes are OK and I suspect the new ones are then I'd be looking at maybe checking/replacing the mechanical fuel pump or check the fuel tank to ensure that its not blocked the main fuel feed.
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thanks Matt
the pipes seem fine and the fuel pumps been changed.. Its almost as if there is too much fuel being pumped through rather than anything being blocked.
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Cheeky
Any chance the float level has been disturbed in the changes? Also the brass pipes press into the carb body I have seen them loose in the past. If this is the case remove it clean it and refit with permanent stud lock.
Eric
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Righto Eric.. will have a look at that too.
thanks
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It was the inlet pipe causing the leak. Once refitted, although the idle was ok I couldnt get the ignition timing right, so Southern Carburettors who are very close to where i live sorted that out. They have a similar set up to Northampton Motorsports who i think some of you know, with a rolling road etc. http://www.southerncarbs.co.uk/ (http://www.southerncarbs.co.uk/) I would recommend them.
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Also the brass pipes press into the carb body I have seen them loose in the past. If this is the case remove it clean it and refit with permanent stud lock.
Eric
Hi all (and original reply to the post Eric) do you stand by this fix? I have this problem. I have found you can buy a tap and fitting to replace but also read about gluing it back in. Any thoughts on what to use?
https://shop.citroenclassics.co.uk/weber-carburettor-inlet-fitting---screw-in-3629-p.asp
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Mark,
I would use that threaded fitting. Much better than
gluing the pipe in. You're almost guaranteed a
permanent fix.
While you're there, do both.
( If not using the return line, there's a fix on my rolling resto page.)
Nigel
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I am going to whip it off tomorrow. Thanks Nigel
Just finished front bushes today and taken the cam end caps off. I have a ARB question, I will search first and post in Suspension if needs be.
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so I tried and tried to get the fuel fitting out and failed. What I did notice was that it had been pushed in, if you pulled it out, it was very rigid and firm. So in the end I used a Loctite down the side of the tube, pulled it into place, and used the activator. I then roughed up the edges of the pipe and used JB Weld. So far so good. If it fails again I will have to cut it off and lever out the stuck section
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so far so good :-)
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I have a similar problem on a carb. I want to overhaul as a spare in that the return pipe has been broken flush with the carb. top. I have managed to carefully drill out the remaining stub and am left with a 6.5mm diameter hole.There is enough metal to drill out to 9mm dia and use the fitting as described but what I have noticed is the original pipes internal diameter has a restriction in it, I have managed to get a 1mm drill in it.Presumably this has been done to restrict the fuel flow from the float chamber? Has the above modification been tried successfully?
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I didnt know that. Luckily my fix seems to be holding.
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I have a similar problem on a carb. I want to overhaul as a spare in that the return pipe has been broken flush with the carb. top. I have managed to carefully drill out the remaining stub and am left with a 6.5mm diameter hole.There is enough metal to drill out to 9mm dia and use the fitting as described but what I have noticed is the original pipes internal diameter has a restriction in it, I have managed to get a 1mm drill in it.Presumably this has been done to restrict the fuel flow from the float chamber? Has the above modification been tried successfully?
Assuming you wish to use the return function, I would drill out to 6.8mm and tap an M8
thread.
Then ask a local machine shop to make up a brass tube threaded insert. A simple job.
Fit the insert with suitable locker/sealant.
I didn't know about the 1mm inside diameter, but that could be included in the design.
Nigel
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Please check if the 1mm restrictor is factory or DIY owner attempt to fix a fueling issue actually else where like pump tank filter or carb intake mesh screen!