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1991 525i fuel pump voltage problems

  
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John J

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Since: Mar 02, 2008
Posts: 2



(Msg. 1) Posted: Sun Mar 02, 2008 12:22 pm
Post subject: 1991 525i fuel pump voltage problems
Archived from groups: alt>autos>bmw (more info?)
I have a 1991 525i that has no voltage at the fuse for the fuel pump. I have
changed the relay for the fuel pump already, can someone tell me where to
check next?

 >> Stay informed about: 1991 525i fuel pump voltage problems 
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Scott Dorsey

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Since: Aug 24, 2005
Posts: 268



(Msg. 2) Posted: Sun Mar 02, 2008 8:24 pm
Post subject: Re: 1991 525i fuel pump voltage problems [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
In article <15-dnTJz_LTrbVfanZ2dnUVZ_jOdnZ2d.DeleteThis@comcast.com>,
John J <jjefferson27_houston1.DeleteThis@comcast.net> wrote:
>I have a 1991 525i that has no voltage at the fuse for the fuel pump. I have
>changed the relay for the fuel pump already, can someone tell me where to
>check next?

Okay, as I recall, the fuel pump is powered by the fuel pump relay, which
is powered by the main relay. Main relay has power at all times, which
it gets through a fusible link right off the battery, right?

The electrical manual will tell you for sure, and barring that you can take
the fuse box apart and see where the wires go. You sure the main relay is
good? Put the relay you took out of the fuel pump position into the main
relay spot.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 >> Stay informed about: 1991 525i fuel pump voltage problems 
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hsg

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Since: Sep 14, 2003
Posts: 363



(Msg. 3) Posted: Sun Mar 02, 2008 9:44 pm
Post subject: Re: 1991 525i fuel pump voltage problems [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Sun, 2 Mar 2008 12:22:43 -0600, "John J" <jjefferson27_houston1 DeleteThis @comcast.net>
wrote:

>I have a 1991 525i that has no voltage at the fuse for the fuel pump. I have
>changed the relay for the fuel pump already, can someone tell me where to
>check next?
>

The ECU controls the pump and it also connected via the speed limiter which in
your case is not needed as the car won't touch 155mph but it is still controlled
by the ECU - perhaps it gone dead.

--

Sir Hugh of Bognor

The difference between men and boys is the price of their toys.

Intelligence is not knowing the answer but knowing where and how to find it!

Hugh Gundersen
hsg DeleteThis @h-gee.co.uk
Bognor Regis, W.Sussex, England, UK
 >> Stay informed about: 1991 525i fuel pump voltage problems 
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John J

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Since: Mar 02, 2008
Posts: 2



(Msg. 4) Posted: Tue Mar 18, 2008 2:02 am
Post subject: Re: 1991 525i fuel pump voltage problems [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
That was it, I swithced the relays around. There were three of the same
type. Thanks a lot.
"Scott Dorsey" <kludge.RemoveThis@panix.com> wrote in message
news:fqfk0o$dfr$1@panix2.panix.com...
> In article <15-dnTJz_LTrbVfanZ2dnUVZ_jOdnZ2d.RemoveThis@comcast.com>,
> John J <jjefferson27_houston1.RemoveThis@comcast.net> wrote:
>>I have a 1991 525i that has no voltage at the fuse for the fuel pump. I
>>have
>>changed the relay for the fuel pump already, can someone tell me where to
>>check next?
>
> Okay, as I recall, the fuel pump is powered by the fuel pump relay, which
> is powered by the main relay. Main relay has power at all times, which
> it gets through a fusible link right off the battery, right?
>
> The electrical manual will tell you for sure, and barring that you can
> take
> the fuse box apart and see where the wires go. You sure the main relay is
> good? Put the relay you took out of the fuel pump position into the main
> relay spot.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."
 >> Stay informed about: 1991 525i fuel pump voltage problems 
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Scott Dorsey

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Since: Aug 24, 2005
Posts: 268



(Msg. 5) Posted: Tue Mar 18, 2008 11:10 am
Post subject: Re: 1991 525i fuel pump voltage problems [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
John J <jjefferson27_houston1.TakeThisOut@comcast.net> wrote:
>That was it, I swithced the relays around. There were three of the same
>type. Thanks a lot.

My local dealer insists that the Bosch relays "never fail" and that if
there is some electrical problem the relay is the last thing to check.

He's wrong. And there are a _lot_ of relays that all need to be working
right.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
 >> Stay informed about: 1991 525i fuel pump voltage problems 
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