<VV> The YH Pump - my final answer

[corvairduval at cox.net]

The formatting still sucks, but I think I see your points. I am stuck using
mail2web here, so my formatting is bad also.

When I test my YH during rebuilding, the accelerator pump rod moves up and
down, and this is obviously with no engine vacuum.

Frank DuVal

Original Message:
-----------------
From: Dennis PLEAU ddpleau at msn.com
Date: Fri, 18 Jul 2008 09:55:39 -0600
To: virtualvairs at corvair.org
Subject: Re: <VV> The YH Pump - my final answer


Hopefully the formatting holds together this time.  I hate hotmail.
 
This answer brings up a lot of questions.  Inserted in your text



 From: gyoungwolf at earthlink.net  Let me hopefully prevent some hysteria
about the function of the YH accelerator pump. I am going to quote this
from the Carter YH manual so as not to be defamed:  "The accelerator pump
circuit provides a measured amount of fuel, which is necessary to insure
smooth engine operation for acceleration at speeds below approximately 30
MPH. (P) Accelerating pump action is controlled both mechanically and by
manifold vacuum in the same manner as the metering rod. When the throttle
is closed, the diaphragm moves downward and fuel is drawn into the pump
fuel chamber through the intake check.  >>>>>Does the mechanical connection
or the manifold vacuum move the diaphragm down? >>>>Is there a rod or
something connected to the diaphragm that moves it down or is it only the
vacuum? The discharge check is seated at this time to prevent fuel from the
nozzle passage being drawn into the pump chamber. When the throttle is
opened, the diaphragm moves upward forc
 ing fuel out through the discharge passage, past the discharge check, and
out of the pump jet, which directs the fuel up the nozzle passage and out
the end of the nozzle.....If the throttle is opened suddenly, the upper
pump spring will be compressed resulting in a smoother pump discharge of
longer duration." >>>>>Is this spring the mechanical connection?  So yes,
Virginia, there is a squirt if you pump the accelerator rod....the
prosecution rests... The CarbmeisterDennis "too many years playing and
engineer to accept this answer" Pleau
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