Subject: Re: [TR] >>NASS Spitfire 1500 Mech fuel pump

From: ptegler <[email-masked]>
Date: Sun, 14 Sep 2014 22:55:06 -0400

The volume will depend on the actual rpm (number of pumps) and whether 
the pump is fully releasing all the gas in it.

your mechanical pump lever, which rides on the cam lobe, pulls gas into 
the pump when the lever is driven into (pushed towards) the pump as such.
. From there the fuel is only spring pressure pushed up to the carbs.
It takes about 6-12 pump cycles to fill a pair of HS4 float chambers.  
(depends on the actuall pump version)
On the units with the lever at the bottom, manually pumping the lever it 
should start getting easy once the bowls fill as you are no longer 
pulling gas from the tank as the pump has not emptied from the last pump 
stroke once the floats/needle valve close the bowls off.

ptegler

On 9/14/2014 8:10 PM, Berger Bob [email-masked] [nass] wrote:
> Does anyone know how much fuel I should get out of the mechanical pump when cranking the engine for 30 seconds?
>
> I'm trying to test my pump.
>
> Bob Berger
> 78 Spitfire
>
> ------------------------------------
> Posted by: Berger Bob <[email-masked]>
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