RE: Re: RPM Relay

["content22207" <brobertson@xxxx>]

Is a big loop -- if not safety concern, what does it matter if pump
runs engine off? In theory injectors should be closed (air sensor
plate / fuel distributor piston closed). Not long ago helped a fellow
with an Audi (Bosch Jetronic of some ilk) that ran pump whenever car
was energized.

Obviously RPM relay signal not enough fast enough to pressurize the
system when starting, otherwise we all wouldn't have to replace our
fuel accumulators. 

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@xxxx> wrote:
> The Idle Relay is not in case of an accident. It's purpose is to only
> allow the fuel pump to run when the motor is running or starting. It
> prevents the fuel pump from running if the engine is not running but
> the key is left on. Brett had the origional old style in his car and
> Rob said they do fail but the newer replacement is more reliable. I
> used a paper clip straightened out to jumper the relay. Only do it for
> testing purposes, do not leave the jumper in there. I believe he had
> several problems as when we got the car back to the shop I examined
> the pickup hose in the fuel tank and the fuel level was very low even
> after adding gas and the hose was soft and kinked. The fuel baffle
> was out of place too so on turns the pump would starve for fuel. These
> hidden areas of the of the car are IMPORTANT. It is a case of "out of
> sight, out of mind". If any of you haven't been in your fuel tank you
> should have it examined and replace any deteriorated parts. His gas
> gauge was reading 1/4 tank too so I think his origional sending unit
> is less than accurate. We also had to deal with a weak battery that
> probably should be replaced. Generally 1 problem dosn't get you, it is
> a combination of little things that collectively catch you.
> David Teitelbaum
> vin 10757
> 
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> > I believe this was a safety feature of some sort, so car wouldn't keep
> > pumping fuel in case of an accident that stopped engine. Is also what
> > makes accumulator necessary (not just to start vehicle, but to smooth
> > out all those pulses!). Was going to rig up a bypass switch (answer to
> > whatever ailed #5939 in those heady early days. Same under dash switch
> > has been used for EVERYTHING), then discovered myself how easy it is
> > to jump during fuel system diagnosis. Except for inconvenience of
> > pulling over, is now long term solution (don't all DeLorean owners
> > carry 2 and 3 way jumpers in that little tray in back of console?).
> > John Hervey has a nice pic everyone should familiarize themselves
with:
> > 
> > www.specialtauto.com/delorean-images/rpm-relay-jumper.jpg
> > 
> > DeLorean owners do seem to have elevated concern for fellow motorists,
> > eh? Wonder if you'd get same response in a Lexus...
> > 
> > Bill Robertson
> > #5939
> > 
> 
> > > 83 #17006
> > > 81 #3049