<VV> Re: Manual operation of fuel pump (was Jogging Fuel Pump)

[Dave Ziegler]

on 11/10/04 12:05 PM, N. Joseph Potts at pottsf@msn.com wrote:

> Here's an idea (I haven't consciously tried the idea myself, but I HAVE
> manually pumped without damaging the pump - an accident, I guess). If you
> LOOSEN the set screw that positions the pump shaft in the bore in the
> engine, you introduce what I'll call "axial slack" - an ability to displace
> the pump back and forth along its axis in the bore. If you loosen this screw
> as much as you can before it lets go the pump shaft altogether, but no
> further, you'll get a stroke that SHOULD be long enough to pump, but short
> enough not to damage the pump. Just as important, that stroke will be in
> "the right place" axially, referred as it is to the position of the set
> screw and the dimple the set screw engages.
> Anyway, that's how I'd "try to be careful," along with just never
> pushing or pulling very hard.
> 
> Joe Potts
> Miami, Florida USA
> 1966 Corsa coupe 140hp 4-speed with A/C
> 
> -----Original Message-----
> From: virtualvairs-admin@corvair.org
> [mailto:virtualvairs-admin@corvair.org]On Behalf Of Robert Hawley
> Sent: Wednesday, November 10, 2004 2:27 PM
> To: virtualvairs@corvair.org
> Subject: <VV> Re: Manual operation of fuel pump (was Jogging Fuel Pump)
> 
> 
> Howdy all.
> After reading the recent string of posts I confess to being a bit confused
> on
> this issue of utilizing the fuel pump manually to get gas to the carbs.
> Earlier this year, I was advised several times on this BB to use the fuel
> pump
> manually to prime the YH carb after it had been sitting to reduce the time
> that the engine has to crank to pull fuel from the tank. No one at that time
> mentioned possible damage to the pump.  When resurrecting my Spyder (after a
> 3
> year hiatus), I loosened the pump and pushed it until the gas filled the
> carb
> bowl.  I admit to not being aware that the pump rod stroke supplied by the
> engine was so short.  The car still works so I can guess that I didn't
> totally
> ruin the pump (original as far as I know).   Is the advice to hand pump now
> incorrect?  Are there any alternatives to make it easier to get gas to the
> carb after non-use (please no electric fuel pump discussion - lol) or was
> the
> main point that care is indicated in manually using the pump so as not to
> damage the pump diaphragm ?  If so, how does one "carefully" utilize the
> pump
> by hand?
> Thanks in advance, Robert Hawley (1963 Spyder convert)
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On Rochester carbs I use a pump type oil can full of gasoline to fill the
bowls through the vent holes. No need to mess with the pump at all.

Dave.. .
-- 
Corvair Therapy
Mechanical repair &
minor restoration