<VV> Electric Fuel Pump Install?

Dale Dewald d66dewald at gmail.com
Tue Mar 13 22:19:51 EDT 2018


On 3/13/2018 12:00, Arlette Pat & Carl Kelsen wrote:
> G?day everyone from Australia ?down under?
> Well here?s my latest Corvair problem! Hopefully someone can help, because I am pulling what little hair I have left from frustration?
> I am experiencing considerably difficulty drawing up an electrical wiring diagram, that will agree with the (3) three sets of individual instructions supplied with each of the following Clarks Corvair supplied parts:
>
>    1.  Electric Fuel Pump (Part No. C10295)
>    2.  Oil Pressure Safety Switch
>    3.  Inertia Safety Switch
> I firmly believe that others must have also been confused by these quite vague instructions or alternatively have unknowingly installed the two ?safety switches? incorrectly to the point that the safety switches might not work if the need came about.
 >>snip<<
> I will try to scan / attach a copy of my wiring diagram on this email. Has anyone got any advice on this issue or can anyone tell me where I am going wrong?
Hello Carl,

I am not a fan of using the oil pressure switch for power cutoff to and 
electric fuel pump, mostly because you must add extra circuitry to 
somehow power the pump when cranking before the oil pressure comes up.  
I think a better solution is to use a VW/Audi/Porsche fuel pump relay 
which senses the ignition coil pulses to activate power to the pump.  If 
the engine stops turning or the ignition is killed the relay will sense 
no more pulses and shut off power to the pump.  I would however keep the 
inertia switch in the circuit to add redundancy to the system in case of 
a collision where the engine somehow kept running.

The relay is a common part, Kaehler 433-906-059, available here in the 
USA for about $20 new.  A description on how the relay operates and a 
pinout table for hooking it up is on this web site:
https://www.ratwell.com/mirror/www.dolphinsci.com/relay.html

The relay could be mounted in the engine compartment just above the main 
wiring harness connector.  You would want to attach terminal 15 to the 
ignition ON [black/pink] wire on the main harness side of the 
connector.  Terminal 87 [power] would be attached through a fuse to the 
red plastic insulated battery power supply terminal (HRPT) on the frame 
rail.  Terminal 31b [trigger] would follow the engine harness and attach 
to the coil negative terminal.  I would mount the Ford inertia switch 
right next to the relay, attach a wire from terminal 30 [power to pump] 
to the inertia switch, then run a wire from the other terminal of the 
switch forward to the pump.

Dale Dewald
Hancock, MI



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