Ultra-rich Fuel Mixture and Flooding Inlet Manifold Drains

[Michael Oritt]

Walter--

In your initial post you said you "recently revised" the engine. Were any of those revisions related to the fuel system?
Have you actually fitted the fuel pressure regulator and if so what did it read when you decided "it did not solve the issue"?
Did you try to adjust the pressure down and if so what was the result?
Have you followed Red's suggestion of checking the fuel level at the jet bridge?
Have you considered fitting an SU pump?

 

[Govtslug]

All the suggestions sound good, but if you think there might be any debris in the carbs at all, you could try flushing them out. disconnect the fuel lines and run the engine until you burn all the fuel in the carbs and the engine dies. Then squirt a can of carb cleaner into the carbs and lightly tap a wrench on the bottom of the float bowls. The vibrations should free up anything sticking. You can also try blowing a little compressed air into the carbs (20lbs pressure or so). Reconnect everything, start it up and see if it improves. I had to do it twice before everything on my strombergs loosened up.

 

[Bugeyze]

Thanks for the reply. How do I check this? Do you mean the float bowls? The drains on the cover of the float bowls are open if that is what you refer to.

Hi, if the drains are open, compressing air is not the problem.

 

[Walter74]

Walter--

In your initial post you said you "recently revised" the engine. Were any of those revisions related to the fuel system?
Have you actually fitted the fuel pressure regulator and if so what did it read when you decided "it did not solve the issue"?
Did you try to adjust the pressure down and if so what was the result?
Have you followed Red's suggestion of checking the fuel level at the jet bridge?
Have you considered fitting an SU pump?

i installed a revision kit on the carbs and changed the old fuel filter with a new one. Also all fuel hoses have been replaced.
I fitted the pressure regulator and regulated back to 2 psi there was still dripping fuel from the inlet manifold drain and the mixture was ultra rich. Fuel level at bridge was not visible in jet.

 

[Walter74]

All the suggestions sound good, but if you think there might be any debris in the carbs at all, you could try flushing them out. disconnect the fuel lines and run the engine until you burn all the fuel in the carbs and the engine dies. Then squirt a can of carb cleaner into the carbs and lightly tap a wrench on the bottom of the float bowls. The vibrations should free up anything sticking. You can also try blowing a little compressed air into the carbs (20lbs pressure or so). Reconnect everything, start it up and see if it improves. I had to do it twice before everything on my strombergs loosened

I disaasembled both carbs and cleaned every single part, but i will try this method just to see if it helps.

 

[Michael Oritt]

i installed a revision kit on the carbs and changed the old fuel filter with a new one. Also all fuel hoses have been replaced.
I fitted the pressure regulator and regulated back to 2 psi there was still dripping fuel from the inlet manifold drain and the mixture was ultra rich. Fuel level at bridge was not visible in jet.

Hi Walter--

Thank you for you reply. Mixture and fuel level are separate issues but putting mixture aside for the moment I am at a loss to understand how, if you are making this observation with the ignition on and the pump is energized, fuel can be escaping from the manifold drains and yet not be visible at the bridge.