Re: Relay getting hot...

[Night Shadow <soltwede@ucsub.colorado.edu>]

In my experience, on these older cars, it's fairly typical to see almost a
volt drop on anything downstream of the fuse box.....I'd try replacing
your fuel pump relay, and cleaning all the connectors at the back of your
fuse box...see if it improves

Eric


On Mon, 21 Jun 1999, William J Erikson wrote:

> I have about a 1v drop between the pump and the battery. Should I rewire
> everything, then?
> 	-Josiah
> 
> 
> 
> 
> On Mon, 21 Jun 1999 10:44:20 -0400 Nigel Heron <scirocco@psycode.com>
> writes:
> >
> >
> >William J Erikson wrote:
> >
> >> Hey all,
> >>         I went out to my '84 GTI this morning and installed the fuel 
> >pump that
> >> Brian sent me. It appears to be in awesome condition, thanks Brian!
> >>         Everything seems fine, the car starts and runs, etc, but the 
> >relay is
> >> getting hot. The fuel pump buzzes, but it's an even pitch like I'm 
> >used
> >> to. Almost all of them sound like that.
> >>         I have a switch installed for the fuel pump that is relayed, 
> >so the
> >> relay is your standard issue 30 amp relay. I have no fuel pressure
> >> accumulator - I deleted it from the system when I found out how much 
> >a
> >> new one (and the lines!!) would cost me. I now have another one... 
> >maybe
> >> I'll reinstall it. Should I? Would this have anything to do with 
> >the
> >> relay getting hot?
> >>         The relay getting hot means that the fuel pump is drawing 
> >too much
> >> power, right? The fuel pump is not getting hot or doing anything 
> >odd.
> >> It's staying quite cool. Voltage at the pump is... well, as good as 
> >it's
> >> going to get in my car, around 12 volts.
> >>         My alternator puts out about 12.8 volts when cold, then 
> >drops to about
> >> 12.1 - 12.2 when hot. Do I need a new alternator, or could this be 
> >just
> >> the voltage regulator? My battery never runs down or anything.
> >>         Thanks for any advice, suggestions, ideas, etc.
> >>         -Josiah
> >>         '84 GTI
> >>         '87 QSW
> >>         http://bork.hampshire.edu/~josiah
> >
> >the fuel pressure accumulator is used to keep pressure in the system 
> >after the
> >pump has turned off. This helps prevent vapor lock and makes starting 
> >easier
> >'cause the fuel in the lines is already somewhat pressurized. The 
> >accumulator also
> >dampens pulses created by the main pump. It's probably not the cause 
> >of you're
> >relay getting hot. The relay will get hot if it's dead or if your 
> >pumps are
> >drawing too much power (like you said..), if you say your main pump 
> >looks
> >allright, then check your transfer pump, it may be dying or seized. If 
> >the GTi
> >doesn't have one then it could be that your wiring is rusted, is your 
> >pump voltage
> >12 when your alternator is at 12.8 or when it's at 12.1? if it's a 0.8 
> >drop then
> >something is wrong, a 0.1 or 0.2 drop is ok, i think. You could always 
> >try the
> >relay out of your quantum in the GTi and see if it gets hot too.
> >
> >-nigel.
> >86 Scirocco
> >85 Scirocco
> >http://scirocco.psycode.com
> >
> >
> 
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