[TR] HS4s fuel level problem

[Roger Elliott]

More information:

The carb with the highest level of fuel in the fuel bowl, has the lowest 
level of fuel in the jet.

I have switched bowls.  I moved the lids and floats from one to the 
other.  The problem stayed with the rear carb.

I weighed the floats, they are the same to the accuracy of my scale - 7 
grams.

I took one lid and float and moved it between the 2 carbs.  The back car 
still had a much lower level in the jet even though it had the highest 
level in the bowl.

When I changed bowls I made sure there was not an obstruction in the 
hole that the jet tubing goes into.

I know the engine sits at a bit of an angle with the back being a bit 
lower.  But it seems the carbs are create separate systems, so the fuel 
level should be closer between the two than what I can get.

Thanks,
Roger

On 09/06/2014 02:58 PM, Roger Elliott wrote:
> Hi,
>
> I have a 1980 Spitfire with dual HS4s on it. I have been having 
> problems getting the fuel level set correctly in the carbs.
>
> The fuel in the rear jet (~.30) is way lower than the fuel ion the 
> front jet (~.20 )  The floats are the non adjustable plastic, but I 
> have modified the rear one so it is only about 1/16"  where as the 
> front one is closer to 3/8".
>
> I took off the lids and floats of the fuel bowls - the rear level is 
> about .9' and the front one is 1.02".  This seems like the fuel in the 
> rear jet should be slightly higher than than the front, but is not.
>
> The jets are new as the old ones seemed to have a bit of a crimp in 
> the line between the bowl and the jet.  I used compressed air to blow 
> through the jet and into the rear bowl.  It seemed to be fine.
>
> Does any one have a suggestion of what I might be over looking?
>
> Thanks,
> Roger Elliott
>
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