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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
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255); text-decoration-style: initial; text-decoration-color:
initial; display: inline !important; float: none;">Every now and
then the new viton tipped float needles are sticking on one or the
other of my HS-4 carbs. When it happens if I tap on the top of the
offending carb's float bowl using a screwdriver handle and with
the fuel pump energized, the needle valve opens and I can hear the
fuel pump fill the bowl. This started happening in the summer of
2016. I replaced the needle & seat assemblies in both carbs
with aftermarket units. It didn't cure the problem.</span><br
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<br style="clear: both; color: rgb(0, 0, 0); font-family: Arial,
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
sans-serif; font-size: 14px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans: 2;
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255); text-decoration-style: initial; text-decoration-color:
initial; display: inline !important; float: none;">Several weeks
ago I put in new OEM viton-tipped needle & seat assemblies.
Then as I was adjusting the jets both carbs ran dry & the
engine stopped. So I tapped on one carb bowl & then the other,
heard the pump run while filling them up. The engine then started
right back up. Last time it happened I had the engine warming up,
running at fast idle when it started running very rough. I Tapped
on the front carb bowl whilst it was still running & it
smoothed right out. Same thing happened another time but it was
the rear carb.<span class="Apple-converted-space"> </span></span><br
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<br style="clear: both; color: rgb(0, 0, 0); font-family: Arial,
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
sans-serif; font-size: 14px; font-style: normal;
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font-weight: normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform: none;
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255); text-decoration-style: initial; text-decoration-color:
initial; display: inline !important; float: none;">The fuel pump
is a ~5 year old SU with points. I measured the fuel pressure at
the carbs to be 4 psi on the nose and it doesn't leak down much or
very fast. It has a new inline fuel filter mounted just before the
carbs. The floats are the all-plastic type and they don't show any
sign of leakage. The floats are very free on the swivel pins and
will drop to the stops.The swivel holes in the floats aren't
visually elongated and the swivel pins don't show appreciable
wear. The carb's vents are clear and I can blow air through the
vent tubes.<span class="Apple-converted-space"> </span></span><br
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<br style="clear: both; color: rgb(0, 0, 0); font-family: Arial,
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
sans-serif; font-size: 14px; font-style: normal;
font-variant-ligatures: normal; font-variant-caps: normal;
font-weight: normal; letter-spacing: normal; orphans: 2;
text-align: start; text-indent: 0px; text-transform: none;
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255); text-decoration-style: initial; text-decoration-color:
initial; display: inline !important; float: none;">I thought maybe
the 7 month old gas might be a contributor to the problem but we
put about 100 miles on the car last Tuesday after putting in fresh
mid-grade gas, looking at Hill country wildflowers. The car will
maintain 70 mph in hilly country all day. Ran like a swiss watch<span
class="Apple-converted-space"> </span></span><br style="clear:
both; color: rgb(0, 0, 0); font-family: Arial, Helvetica,
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
sans-serif; font-size: 14px; font-style: normal;
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font-weight: normal; letter-spacing: normal; orphans: 2;
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255); text-decoration-style: initial; text-decoration-color:
initial; display: inline !important; float: none;">I'm at my wits
end on this. Could pressure somehow be building up in the bowls
now and then? How?<span class="Apple-converted-space"> </span></span><br
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<span style="color: rgb(0, 0, 0); font-family: Arial, Helvetica,
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initial; display: inline !important; float: none;">CR</span><br
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