<VV> The YH Pump - THE final answer

[Louis Armer]

Hmmm..........................I guess this means that GM cured 
flooding in Turbos.................
Now if we can just get the cure for 140's !!! <GGG>

FrontMan
WTBRT PR
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At 05:44 PM 7/18/2008, you wrote:


>It's strange that such a simple device gathers such varying opinions of
>operation.
>
>
>For the YH accelerator pump to work at all, manifold vacuum MUST be present
>to suck the pump diaphragm down. There is no throttle action that will cause
>this to happen, only manifold vacuum. Once the diaphragm is down, 
>fuel will fill
>the pump chamber waiting for the throttle to be opened. The opening throttle
>will raise the pump link which will allow the metering rod arm to raise the
>metering rod for a richer mixture and will also allow the lower 
>spring to force
>the diaphragm to raise (overcoming the now lower vacuum holding the diaphragm
>down) forcing the fuel in the pump chamber into the air stream.
>
>This is all with the engine running.
>
>When the engine is shut off, the pump diaphragm loses its vacuum and raises
>up as far as it will go. Now any opening of the throttle will simply 
>raise the
>metering rod and its arm (with no effect) but the pump link simply slides
>inside the metering rod arm and does not move the diaphragm at all. 
>Thus opening
>and closing the throttle with the engine off will not actuate the 
>diaphragm at
>all.
>
>Regards,
>Bob Helt
>/////////////////////////////////////////////////////////////////////////////

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