Weber carb question
Discussion
Yesterday evening after a drive heard a faint dripping noise, found a small puddle of petrol on the garage floor. Traced it back to the end of this small hose which was hanging loose, I followed back confirming it was from the carb. Does anybody know whether the line should be connected to something at the other end? I sort of assumed it was a fuel return feed but the hose isn't long enough to reach either the fuel tank nor mechanical lift pump. Otherwise it appears to be a fuel venting line, which simply exits overboard and doesn't seem right.
Carb is a Weber ICH 34, on a 2.25 petrol Landie.
Pics below showing the line from the carb
I've consulted my manuals however it only refers to Zenith and Solex carbs, which isn't much use. If anyone has any knowledge of Weber carbs and knows what this line a) is supposed to be and b) whether it's supposed to be open at one end would be grateful to know.
Thanks in advance
Carb is a Weber ICH 34, on a 2.25 petrol Landie.
Pics below showing the line from the carb
I've consulted my manuals however it only refers to Zenith and Solex carbs, which isn't much use. If anyone has any knowledge of Weber carbs and knows what this line a) is supposed to be and b) whether it's supposed to be open at one end would be grateful to know.
Thanks in advance
Just to add, there is no fuel overflow on that carb, there is a needle and seat that shuts off the flow of fuel to the float bowl when the float rises high enough. Much like a toilet cistern refilling after a flush.
If you don't have a distributor with an advance canister then plug the outlet, it will make the engine run like total arse not connected to anything on the other end.
If you don't have a distributor with an advance canister then plug the outlet, it will make the engine run like total arse not connected to anything on the other end.
Muddle238 said:
Thanks guys, looking at the dizzy it currently has this setup:
I'm guessing the line should sit in like this?:
In which case I'm missing a part that would secure the line in place
No, you have completely the wrong fitting for that style of vacuum advance. The old type with a screw thread used a copper pipe with brass fittings like this. However I'd make sure the vacuum advance capsule is actualy working before fixing this, that one looks like it may have been serving duty on the Titanic. If not you should be able to get an advance capsule that has the more common push fitting that your hose will connect to, in fact it may be cheaper to get a new capsule anyway looking at the price of the copper pipe.I'm guessing the line should sit in like this?:
In which case I'm missing a part that would secure the line in place
No vacuum advance will hurt fuel economy which is bad enough anyway on old Landies, so worth making it work.
Edited by Mr2Mike on Tuesday 12th June 18:01
GreenV8S said:
Have you confirmed the petrol was actually dripping from that line? There should not be petrol dribbling down a vacuum line.
Indeed. If there is, then there's a shagged diaphragm internally, probably, but I've never had a Weber apart to know what's inside of them apart from pingf
kits and magic.Kccv23highliftcam said:
IIRC a twin carb holds about a pint??
Y'mean a twin-choke? Less than that. At a guess, 150ml or so max.Mr2Mike said:
No, you have completely the wrong fitting for that style of vacuum advance. The old type with a screw thread used a copper pipe with brass fittings like this. However I'd make sure the vacuum advance capsule is actualy working before fixing this, that one looks like it may have been serving duty on the Titanic. If not you should be able to get an advance capsule that has the more common push fitting that your hose will connect to, in fact it may be cheaper to get a new capsule anyway looking at the price of the copper pipe.
No vacuum advance will hurt fuel economy which is bad enough anyway on old Landies, so worth making it work.
This would explain quite a lot. A majority of this particular Land Rover is "original" and as a result, tatty as hell. It's due to be dismantled and restored this Autumn, I keep finding oddball "design choices" by the chap who pulled her out of a hedge and recommissioned her, but this one is new on me. I may well just buy a new capsule I think, easier to fit that for now and worry about the original capsule later when everything else is rebuilt and restored. No vacuum advance will hurt fuel economy which is bad enough anyway on old Landies, so worth making it work.
Edited by Mr2Mike on Tuesday 12th June 18:01
TooMany2cvs said:
Probably bodged by whoever shoved the Weber on in the first place, instead of the Zenith that it would have started life with.
Duck egg blue block, IIRC, is an ex-MOD engine.
I guess the Zenith was discarded during recommissioning work by the previous owner. It's always been a civilian vehicle, makes me wonder where the original engine ended up, probably on an old scrapheap somewhere. Duck egg blue block, IIRC, is an ex-MOD engine.
Muddle238 said:
I guess the Zenith was discarded during recommissioning work by the previous owner. It's always been a civilian vehicle, makes me wonder where the original engine ended up, probably on an old scrapheap somewhere.
Dead engine could well be why it ended up in the hedge in the first place.As an aside, I had a pair of 34ict (look the same as that ich) webers on an old vw and they were an absolute joy to work on, very simple to set-up. I don't know what the reputation of a zenith is but if it's anything like the pierburgs of old then the weber is an upgrade.
Plug the port on the carb end to stop the mixture running lean, that hole is sucking whilst the engine is running and it's below the throttle plate so you're introducing "unmetered" air in to the intake = lean = bad.
Plug the port on the carb end to stop the mixture running lean, that hole is sucking whilst the engine is running and it's below the throttle plate so you're introducing "unmetered" air in to the intake = lean = bad.
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