I'll add that Price has sent pictures of his pump's wiring and I can see
nothing amiss. I'm stumped (even more than usual).
There is a shunt resistor in the solenoid body, but AFAIK any pump can run pos.
or neg. ground, as long as whatever
spark suppression device is used accommodates it.
Bob
On 12/31/2012 11:27 AM, R. Price Lindsay wrote:
> Listers -
>
> First I would like to thank Bob Spidell and Bob Haskell for all of the help
> they have given me over the past few days while I struggle to make my positive
> earth fuel pump polarity neutral (so you know, there was a band on it stating
> "Positive Earth Only."
>
> My intention was to install a transil and do away with the diode (supposed to
> accomplish neutrality per the list). I am now at the point where the unit
> works very well only with a positive earth diode installed, i.e. with or
> without a transil. If I install only the transil and don't use the diode,
> the points on the pump open once and stay open (does not run). Everyone
> seems to agree that this is unusual and the pump should work fine with either
> the transil or the diode, but it doesn't.
>
> I currently have both the transil and the diode installed.
>
> Now my questions:
> Is there any value in this configuration, i.e. they both suppress spark, I'm
> told; is that a good thing?
> While the pump runs on the bench grounded either positive or negative, is it
> really polarity neutral configured as above?
> If I change the polarity of the car sometime in the future to negative ground,
> keep the configuration as is, will the pump run for a while but then fail?
>
> Thank you so much for any light you can shed on this.
>
> Price Lindsay
> 67 BJ8
>
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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