22-04-2019, 11:15 AM
Hi,
The Zenith Carb suffers from heat soak once the engine has been switched off which in turn accelerates the fuel evaporation.
You will find also find that fuel will drip out of the emulsion block into the manifold.
A Tufnol spacer could be used between the carb and manifold to slow down the heat soak.
If you have weak springs and dirty valves in the fuel pump it will make priming slower and allow fuel to drain back down into the pump from the pipe to the carb.
You are unlikely to have a leak from the float chamber but possibly the emulsion block gasket is failing which will allow petrol to seep out.
If the copper fuel pipe is too close to the exhaust you will have problems as well.
As far as my experience goes its perfectly normal having been involved with 7's since the 1970's
The Zenith Carb suffers from heat soak once the engine has been switched off which in turn accelerates the fuel evaporation.
You will find also find that fuel will drip out of the emulsion block into the manifold.
A Tufnol spacer could be used between the carb and manifold to slow down the heat soak.
If you have weak springs and dirty valves in the fuel pump it will make priming slower and allow fuel to drain back down into the pump from the pipe to the carb.
You are unlikely to have a leak from the float chamber but possibly the emulsion block gasket is failing which will allow petrol to seep out.
If the copper fuel pipe is too close to the exhaust you will have problems as well.
As far as my experience goes its perfectly normal having been involved with 7's since the 1970's