<VV> fuel pump power question

[shortle]

"to do it the 21st century way you would need a micro-processor"
And a PEM (pump electronic module) as well as a fuel pressure sensor. This way based on the pressure the PEM controls the pump voltage (which thereby controls the pressure) based on a number of inputs such as fuel temperature, barometric, altitude, etc.
My suggestion is don't do it the 21st century way.
Timothy Shortle in Durango Colorado 81301 


-----Original Message-----
>From: jim bannister via VirtualVairs <virtualvairs at corvair.org>
>Sent: Mar 14, 2015 10:10 PM
>To: Sethracer at aol.com, rmurray at pittsburghpenguins.com
>Cc: 'Virtual Vairs' <virtualvairs at corvair.org>
>Subject: Re: <VV> fuel pump power question
>
>You could do i9t the 20th century way with a relay operated by the series
>contacts in a three leg oil pressure switch.  The relay stays de-energized
>until oil pressure comes up.  You can feed power to the normally closed
>contacts from the power that energizes the starter solenoid.  This give you
>pump as soon as the engine cranks.  When the relay picks, it feeds ignition
>power to the pump via the Ford crash switch.  No toggle switch needed.
>Everything automatic.  To do it the 21st century way you'd need a
>micro-processor.
>jim
>
>-----Original Message-----
>From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
>Sethracer--- via VirtualVairs
>Sent: Saturday, March 14, 2015 1:58 PM
>To: rmurray at pittsburghpenguins.com; virtualvairs at corvair.org
>Subject: <VV> fuel pump power question
>
>Rod asked: 
>
>Seth in  this case does fuel simply flow thru the electric pump when it's
>not  on?
>The original question was for a replacement pump to be mounted near the
>tank. I was just addressing the wiring of the pump power feed - excluding
>either  a shock-opening switch, as used on many Fords, and/or an oil
>pressure - closing  switch, which many add to prevent fuel from flowing if
>the engine has stopped  turning. If a toggle switch is wired as shown below,
>the center position of  the switch will keep the electric pump from running
>at all. 
>Closing the  switch to the latch side will provide ignition switched power
>to enable the  pump (while the ignition is on) and pushing the switch to the
>momentary  side will allow the pump to push fuel into the carbs - with the
>ignition off  - for as long as you are pushing the toggle to that position.
>A shock-switch could be added anywhere in the "Out to Fuel Pump Power"
>circuit out to the pump. It will have to be manually reset when needed.  The
>oil pressure cut-off should be in the "Ignition switched 12 Volts  In" feed
>into this switch. The momentary position on this switch could  then be used
>to fill the carbs after a long "sleep", even if oil pressure  was not yet
>present. 
> That makes for easier starting. 
> 
>And for Rod's specific question. It depends on the pump. Many pumps will
>just let fuel pass through when they are not turned on. Some can act as a
>positive block for flow. You would have to check, or ask for advice on a
>particular brand/model. That is if you are retaining the original mechanical
>pump. - Seth
> 
>Personal Note: - Rod - The Sharks could sure use your help!
> 
>
> 
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