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Q & A: Leaking Jet to Float Bowl Connection

Wednesday January 04th, 2006
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Hi John;

A couple years ago I rebuilt the HS4 carburettors on my Spitfire 1500
engine. About a month ago I found both jets leaking where the jet screws
into the float bowl. I found that the rubberwasher had turned to mush,
probably due to fuel additives, and replace the rubber washer with viton
rubber washers. After a couple days I found again that I have gas leaking
from the connection between the float bowl and the jet. I gave the nuts a
bit more of a turn but they are still leaking. Any suggestions as to what
I may have done wrong?

Also, I am getting gas coming out of the top of the float bowl, right
around the float bowl cover, when I rev up the engine. The carurettors
were rebuilt a couple years ago with a genuine SU rebuild kit, including
replacing the float needle valves. Could it be that the float height is
not correct? These are non-adjustable plastic floats.

Thanks in advance for your time and your comments.

Sincerely,

Mark

Mark!

Some of these rubber parts fail prematurely. I do not know enough
about rubber products to tell you which ones are best. I've always gone to
Viton when there was a question. It is nigh impossible to change th... read more