MGB & GT Forum
Vent line for SU carbs
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My problem of the day.....
There is a vent fitting on each of my SU carbs that doesn't connect to anything. It seems to me that these are vent lines, but if there was a float failure, raw gas would then blow all over the hot engine. Should there be a drain hose or something connected to these fittings?
There is a vent fitting on each of my SU carbs that doesn't connect to anything. It seems to me that these are vent lines, but if there was a float failure, raw gas would then blow all over the hot engine. Should there be a drain hose or something connected to these fittings?
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 Georgetown, TX, USA
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Oct 1, 2014 04:38 PM
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 Joined 12 years ago
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Here is a picture of the '70 evaporative loss system available on the GJ engine.
If you don't have the metal piping, it could be fabricated. From the flexible hose (which originally would have been plain rubber, I used the braided covered hose) it goes to another metal pipe that runs above the heater and terminates at the charcoal (adsorbtion) canister.
If you don't have the metal piping, it could be fabricated. From the flexible hose (which originally would have been plain rubber, I used the braided covered hose) it goes to another metal pipe that runs above the heater and terminates at the charcoal (adsorbtion) canister.
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dbraun99 LLC no longer offers Carburetor Bench Services on SU Carburetors. See www.dbraun99.com for helpful pictures of carburetor rebuilds.
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 Ninderry, KabiKabi country, Queensland, Australia
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Oct 1, 2014 07:13 PM
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Oct 1, 2014 08:08 PM
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Oct 2, 2014 01:22 AM
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Nice looking engines.
The steel webbed piece that connects to the crossover tube to the carbon canister is a good spot for a short piece of clear tubing. I use it to visually make sure there is no carb vent overflow. If there is a flooding floatbowl you see the fuel flowing toward the carbon canister.
In my case I usually open the hood before starting and turn the key on and watch it as the pump clicks until it stops when the bowls are full.
Kind regards
Mark
The steel webbed piece that connects to the crossover tube to the carbon canister is a good spot for a short piece of clear tubing. I use it to visually make sure there is no carb vent overflow. If there is a flooding floatbowl you see the fuel flowing toward the carbon canister.
In my case I usually open the hood before starting and turn the key on and watch it as the pump clicks until it stops when the bowls are full.
Kind regards
Mark
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IMG_0381.jpg 51.1 KB
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