Gurgling twin carbs????

[deano1300]

Hi Guys,
This is a real odd one! I am running twin Weber IVT 34 carbs. After a run and on turning off the engine I lift the engine lid and I can hear one of the carbs gurgling as if fuel is still filling into the carb?? This continued for several minutes? Is fuel still being fed to the carbs and dropping into the engine even though its switched off or is something more sinister going on?? Either way it doesn't sound right? The carbs are new and been running for a year with no noticeable problems although running twin carbs is a bit thirsty! Any thoughts most welcome.

 

[Mr Brightside]

If you search on here, there are a few instances of this, either related to over fuel pressure from a mechanical fuel pump or stuck float. I think there is a maximum recommended pressure or 2-3psi.


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[mrs hoskins]

mine does exactly the same on the same set up, thought it was just me !!........I still get 26 mpg around town, so I assume it cant be too drastic

 

[Mr Brightside]

mine does exactly the same on the same set up, thought it was just me !!........I still get 26 mpg around town, so I assume it cant be too drastic

if they are ICT's, watch for fuel seeping out of the throttle spindles, fuel spilling out over a hot engine is not what you want !

 

[mattd1984]

mine does exactly the same on the same set up, thought it was just me !!........I still get 26 mpg around town, so I assume it cant be too drastic

if they are ICT's, watch for fuel seeping out of the throttle spindles, fuel spilling out over a hot engine is not what you want !

Is this a common fault?

 

[gonzomillstrood]

I had exactly the same with mine. I thought the fuel pump may have still been pressurised once the engine had stopped so I fitted a fuel pressure regulator but it didn't really make any difference. I had the float chambers checked and they worked fine. I was running icts too.

On top of that, my engine caught fire a couple of months ago. When I get it back together I'm going to steer away from weber icts!
I'm not saying that the same will happen to your van as I still don't know the cause of the fire. Just thought I would warn you.

 

[deano1300]

I had exactly the same with mine. I thought the fuel pump may have still been pressurised once the engine had stopped so I fitted a fuel pressure regulator but it didn't really make any difference. I had the float chambers checked and they worked fine. I was running icts too.

On top of that, my engine caught fire a couple of months ago. When I get it back together I'm going to steer away from weber icts!
I'm not saying that the same will happen to your van as I still don't know the cause of the fire. Just thought I would warn you.

Cheers Bud, After a 4 year restoration I don't fancy a fire!!! Now giving this problem some urgent attention!

 

[KateLovesPurple]

Just another thought,

When the engine is switched off you obviously have no more cooling air flow and all the heat within the engine can rise rather than be blown away. With the carbs now sat over the cylinder heads instead of the centre of the engine, this radiated heat could boil away the fuel in your float chambers. This may be what you are hearing.

I know this can happen as I used to have a type 3 running DRLAs and the heat from my exhaust which was tucked away near the left head used to regularly boil the left carb dry after a fast run.