[DML] Re: Fuel Pump Madness

["Harold McElraft" <hmcelraft@xxxxxxx>]

Try cleaning the connections at the coil and on the resistor block.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, "Todd Nelson" <tan5732@...> wrote:
>
> List:
> 
> I think I've done all I can do with this one, so I'm going to open 
it up to you all.  After taking the car out of storage for the 
winter I noticed that when I turned the key to the ON position the 
fuel pump didn't do its regular 2-3 second prime then shut off.  Hmm 
I said and continued to flick the key from ACC to ON. Finally the 
pump did its deal and the car started fine.  I shrugged it off as 
some corroded contacts and went on my merry way, only to find that 
the problem was back when I tried to restart again.  The 
same "solution" of flicking the key seemed to work.  I have been 
told that it may be dirty contacts on the ignition switch, but I 
don't think this is it since the main relay for the ON position 
always works, and everything else that is supposed to come on when 
in the ON position (dash lights, engine electrical components, etc) 
all work fine.  I first suspected the RPM relay, so I opened it up, 
cleaned the contacts on the relay and the same problem continued.  
After A LOT of testing I came to the conclusion that the RPM relay 
was dead, I've heard they are prone to failure and I had an original 
one, so it all added up.  $57 later at my local foreign parts shop 
and my troubles continue!  But at least I have a spare RPM relay 
now.  During my testing I noticed that if I quickly (really quickly) 
plug and unplug the #1 fuse a few times things will work, but if I 
slowly plug and unplug the fuse things will not.  Same goes for the 
key, if I quickly flick to the run position a few times the pump 
will run for those 2 seconds as it should.  I've studied the wiring 
diagram of the car until migraines set in and I can't seem to find 
anything else on this circuit to prevent the pump from pumping.  
It's not the inertia switch, I've bypassed that.  I was also 
thinking possibly the "main fuel relay/LAMBDA relay" as it is on the 
circuit.  But even with that unplugged the symptoms are the same, 
the pump will still function (sometimes) with that relay removed, so 
that can't be it.  I've cleaned all the contacts on the fuses, pump 
connections, relay connections and ground points.  Once I get the 
pump going the car runs and drives fine.
> 
> Any thoughts?
> 
> Thanks,
> Todd Nelson
> 1561, Vermont
> http://www.rit.edu/~tan5732
> 
> 
> [Non-text portions of this message have been removed]
>










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