Okay, lets do this again.
Sorry about the racing freely description, my bad. I have enough
experience and knowledge in this area to be misleading, but I am learning
from everyones replies. Thanks. When the fellow took my car car out,
what I thought was the engine roaring was that the engine did rev higher
once it drop down a gear, but that it could not rev high enough to
increase the cars speed, but as you let up on the gas the tranny would
shift up, and now the engine could pull the car better. I don't want to
attempt to describe the sound because I may mislead, it just didn't sound
like it was bogging. The choke does seem to work well. Fully closed when
cold, secondaries appear to open properly when engine is warmed up
Allow me to describe something and tell me hoiw close I've gotten to the
symptoms.
You accelerate at WOT. The engine speed and car speed increases to a certain
point, and then it seems as if everything stops. Car speed stops increasing.
Engine speed stops increasing. It's as if everything has paused at that
engine speed, and the transmission doesn't want to upshift. The engine may
or may not have a miss. You let off the gas, and the transmission instantly
upshifts. You put your foot back into the throttle, and the engine increases
speed again.
How close is that to what you're experiencing?
If I *have* described it correctly, then you are running out of fuel. The
lower the gear for acceleration, the more demand for gas. Why? Because the
wind up to maximum RPM is quicker and needs a large volume of fuel very,
very fast. The fuel pump is not delivering enough gas volume, probably due
to some type of porosity in the fuel pump diaphragm which *will* greatly
decrease delivered volume. As the engine tries to wind up in first or second
gear, the engine demand drains the carb fuel bowl(s) too quick and the fuel
pump can't keep the fuel bowl(s) full enough to supply gas to the jets and
venturi clusters. Therefore, the carb and the engine runs out of gas. You
take your foot off the throttle for a second, heavy demand is removed off of
the transmission, so it automatically upshifts, the throttle plates on the
carb momentarily close boosting the engine to high vacuum which facilitates
drawing large amounts of gas back into the engine as soon as the fuel volume
catches up, the fuel pump has a split second to catch up and get some fuel
into the fuel bowl(s), the engine drops to a lower RPM due to the upshift,
so the fuel pump can catch up to the lowered RPM and fuel flow demand, the
high engine vacuum causes the carb to flow gas again, the engine catches gas
and then makes power, and you surge ahead.
***If*** everything matches what I've just said, and the reasons for it, you
have a bad fuel pump. The transmission is okay.
I suspect this situation due to your statement about no fuel being available
for startup and having to pump and crank the engine a bunch to start it.
Milton Schick
1964 442 Cutlass
[EMAIL PROTECTED]
