I want to thank everyone who has offered advice on my problem.
Randall wrote:
>> I am at a loss of what else to try. I don't think the mechanical fuel
>> pump can be over powering the floats. Can fuel be coming in around the
>> threads on the jets?
>>
>
> Could be. Have you checked that the sealing washers are in good shape ?
>
I guess you mean there should be some at the base of the jet. When I
bought my lids (just recently) they came with the floats and jets
installed. There were no washers on the jets. I looked at the diagram
that I have from Joe Curto and could not find any washers mentioned. Am
I missing something? or perhaps this version of the SU doesn't use
washers there?
>> I would appreciate any suggestions.
>>
>
> I would remove the lid, put a 3/16" drill rod in place, hold the float against
> it, and blow into the fuel inlet. It should take only very light finger
> pressure to get the valve to seal (or the weight of the float if you turn it
> upside down). If you can blow air through it, then it will leak fuel.
>
> Also wouldn't hurt to put a fuel pressure gauge on temporarily. Most vacuum
> test gauges will read the 2-4 psi of fuel pressure that SUs want; and you
>should
> be able to pick one up for under $20.
>
I haven't tried reinstalling the lids on the carbs yet. But I slowly
filled a jar with water as I was blowing through the fuel inlets. The
floats floated and cut off the air through the inlets before the water
got to the seam on the plastic floats. I was blowing the air with lung
power so it probably doesn't match the fuel pump.
The float bowls seem pretty clean.
I guess I need to reinstall them on the car with a pressure gauge and
see what happens.
Thanks you for your help Randall,
Roger Elliott
=== This list supported in part by The Vintage Triumph Register
=== http://www.vtr.org
|