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<div> I have chased the cause of too much fuel exiting from the =
rear carburetor overflow of my 100 for years. These are H4 carbs-very =
simple design, but must be done correctly to perform. So I find that the =
jet is out of center and piston is sticking up above the flat about =
1/8"-that would allow fuel to run into throttle area and out overflow drain=
tube.
<div> </div>
<div>No way to center jet on car. Remove =
carburetor-a 4 hour job- and clean and replace gaskets and gland =
washers-yes cork- and reassemble and center jet...now works perfect. Re =
mount carburetor and connect fuel lines-another 4 hour job. Both carb=
pistons drop with a clunk at the same time. Turn on key- fuel pump =
clicking-overflow again leaking. </div>
<div> </div>
<div>I have reset the floats and float needles (brass) were replaced many =
times-that's not the issue. No fuel in float bodies-they are not leaking.=
I just cant believe its too much fuel pressure but then again, this =
is a British Car. </div>
</div>
<div>Float is brass but when shaked it=
is dry. I filled the float lid with carb cleaner while holding needle =
valve closed and no leaking. That's two places checked (these are =
unfortunately "new" parts) Now the next leak could be between the needle =
and jet if not closed off-also new parts-jet .090. Needles are QW as =
specified but i also have a set of ATs which are lean that I am tempted to =
try. Actually both needles are about the same at top .089, but ATs are a =
bit fatter at mid range. Problem is all testing stinks up the garage and =
creates an explosive atmosphere so best done outside in the rain.</div>
<div> </div>
<div>I know some folks like Grosse Jets-but I don't-- I =
prefer the simple brass ones with viton tips which do work if pressure is =
applied by forked leg-also new, and set to 7/16" or MORE. With covers off, =
both bowls are equally about 1/2 filled. Fuel pressure is a thought as it =
can push by the stops but its the correct pump and when key on clicks fast =
then slows to a stop... but then tick, tick which it should not do! =
Fuel is going out and down the drain tube to my swimming pool drip pan. Im =
tempted to measure the top of the needles to see if they are really at .089=
. Can't measure the new jet but its stamped "9" Maybe stick in a number =
drill to see if its round? Mind you, these carbs have about 125 miles total=
on them. As far as I know these are "genuine SU" parts-not Moss India =
knockoffs.</div>
<div> </div>
<div>I really thought that the centering=
was the issue and took the carb off for that reason which cured the =
drop-each drops equally with thud. That's not the problem. Any suggestions?=
Someone says use plastic floats...Hank</div>
</div>
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