My guess would be evaporative loss, not necessarily unusual. Did you also
install the heat shield with the HS4s? It is also possible to have leakage
on the jet tubes that go to the bottom of the float bowls. Just run your
finger along the bottom of the tubes - it should be dry. Same with the
point where they screw into the float bowls. I've had leaks there before
when the rubber gasket inside deteriorates.
David Councill
67 BGT
72 B
At 12:35 AM 4/25/2004 -0600, mark lennan wrote:
>All,
>
>Recently converted my 79B to HS4 SUs and am happy with the
>results...BUT...Is it normal for SU carbs to drain their float bowl of 2/3
>of their fuel after the engine has been shut
>off?
>After suspecting a flooding problem, I removed the float chamber tops
>after I got home to observe the results, went in to have a beer...OK 2 or
>3 beers...and when I came out the bowls where 2/3 empty. I can understand
>some evaporation, but even drinking relatively slowly I can't believe that
>2/3 of the fuel could evaporate that quickly!
>As a test I left the chamber tops off throughout the evening, and the next
>morn, the fuel levels where the same.
>I checked for leakage and found none on the outside... leaking into the
>manifold???
>...any thoughts???
>
>Thanks,
>
>ml
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