<VV> The Eternal Mechanical vs Electrical Fuel Pump Question

Jack Kean jkean at sbcglobal.net
Mon May 25 23:14:10 EDT 2009


I have an intertia switch (from a Taurus) and purchased an electronic 
fuel pump controller from David Heath. Here is an explanation of the 
unit that I received from David:

    The controller has a small computer chip which turns on an internal
    relay when power is first applied.  This relay is energized for
    three seconds.  After that initial three seconds, the relay is
    energized only if a tach pulse is present.  The tach signal line can
    hook up to either a "coil - " line (stock tach signal) or a 12v
    square wave pulse (like typically found on an aftermarket ignition
    such as an MSD box.)  Most electric fuel pumps draw about 2.5A and
    specify a 7A fuse be installed in-line, so I included a 7A circuit
    breaker in-line with the relay contacts (one less thing for you to
    concern yourself with).  I have also included several parts to aid
    installation.  I own a corvair and designed this unit for my
    corvair, but it will work in any 12V, negative-ground vehicle.  I
    have included a PDF of the installation instructions to help answer
    any questions.The price is $60 plus $5 shipping via USPS Priority
    Mail.  I can send via other methods if you desire, but in the US,
    the USPS method is the cheapest and is pretty quick. 

The control unit works as advertised. The initial 3 second delay is 
usually enough to get gas into the system after a rest. It is a nice 
small unit, that I mounted under the dash. I did not like the smallish 
wire included to the pump, so I used this unit to control a relay that 
sends 12 volts to the pump.

jack kean
Arlington, Texas

FrankCB wrote:
> Bob,
> With my electric fuel pump (in the tank) I also use the oil pressure switch, the inertia switch (probably from a Ford) and a push button on the dash to bypass both of these to prime the carb for cold starts.
> It's amazing how many Ford car drivers have no idea that their cars have an inertia switch much less where it is and how and when they may need to reactivate it.  I've had to show a few of them where it is and why it may need to be reset.
> Frank "reads my owner's manual" Burkhard
> In a message dated 05/25/09 22:41:37 Eastern Daylight Time, Vairtec at optonline.net writes:
> A side question for the electric users:  What, if any, means have you 
> used to cut off electric power in the event that the engine stops or 
> the vehicle crashes?  (In my track car, I have an oil pressure 
> switch, a Ford inertia switch, and a toggle override switch for cold starts.) 
> --Bob 
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