Re: Probs with fuel pump & RPM relay

[dherv10@xxxx]

88, Knut is correct naturally, My 2 cents is: the coil he is talking 
about is in the distributor ( impulse coil ). I show it on my site. 
If it goes out, you will not be able to start the car unless you hot 
wire it.I know, I just installed a new one in my 11004. 
John Hervey
www.specialTauto.com


--- In dmcnews@xxxx, knut.s.grimsrud@xxxx wrote:
> I think the problem stems from a little misunderstanding of the 
> operation of the RPM relay.
> 
> The RPM relay receives an impulse from the coil (I suspect it's 
> the same signal driving the tach) that essentially informs it that 
the 
> engine is running. After the relay no longer sees any impulses, it 
> will shut off after a couple seconds in order to avoid running when 
> the engine is stopped. Although it is true that the relay will shut 
> off after a couple seconds, I don't think it's supposed to turn on 
> first unless presented with an impuse on its sense signal (first 
> spark when cranking).
> 
> The RPM relay is actually pretty simple and it's based on a 
> run-o-the-mill 555 timer circuit (you can still get 555 timers at 
> Radio Shack even though they really only sell cell phones and 
> remote-controlled cars nowadays).
> 
> Knut
> 
> 
> 
> --- In dmcnews@xxxx, at88mph@xxxx wrote:
> 
> > I'm not getting power to my fuel pump when I turn the key to the 
> 'run'
> > position. (when the pump should run for two to three seconds and 
> then shut
> > off ) I know that my RPM relay is fine. I tested it in another 
> DeLorean
> > and it does work.