Re: Relay getting hot...

[William J Erikson <williamjosiah@juno.com>]

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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