RE: [DML] Re: RPM relay (was I think my fuel pump...)
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RE: [DML] Re: RPM relay (was I think my fuel pump...)

Dave S. 
I would think you have it back wards and David T has it correct.  Priming of
the fuel system is part of the function of the 555 chip on the pc board in
the RPM relay. If you didn't prime first then what would be the point of all
the circuit components on the PC board? All you would need is a pick up from
the pulse coil. I have not seen or heard of a car under normal conditions
that doesn't prime first before starting. I'm not saying it won't, because
it should if the system is still under pressure and the relay on the board
is still good. The timer chip could be bad.  
John Hervey


-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
David Teitelbaum
Sent: Monday, April 30, 2007 10:13 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Re: RPM relay (was I think my fuel pump...)

There are black ones and green ones. The black ones are considered an
earlier version and are more prone to failure. I am not sure which one
"primes". I think it is more an indivdual part than green ones or
black ones. IMHO I would consider the priming function "correct" and
the ones that do not prime "defective". Some Deloreans start up a lot
faster than others, probably due to the "priming". I consider that "a
good thing" as it reduces the strain on the batttery and the starter.
Since this is "undocumented" anyone's opinion is valid. Anyway, I can
not think of any way such a device could fail in manner where it would
"prime". It had to be built that way to do it with the timer put in.
David Teitelbaum
vin 10757

--- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle_dmc@...> wrote:
> A couple of updates from this weekend on this topic - according to 
> some discussion I had with the other DeLorean Motor Company people 
> that were here, the RPM relays that "prime" (i.e. turn on with the 
> key for a few seconds) are considered "defective" and the other ones 
> that don't turn on until the engine cranks are considered "correct".
> I've seen black ones and green ones, in fact I have a green one in my 
> car but I have no idea where it came from. 
> Dave S.
> --- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@> wrote:
> >
> > Andy, Can you tell us more on the replacement or different RPM 
> relay. I have
> > seen a different fuel pump relay but I have never seen a different 
> RPM relay
> > in the DeLorean. What color is the case.
> > John Hervey
> >
> >

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