Two bad new fuel pumps?

[Kneale Brownson]

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You might want to have your alternator's output checked.

At 11:53 AM 06/20/2002 -0500, nde264 at lulu.it.northwestern.edu wrote:

>Six months ago I had the fuel pump and filter replaced on my 89 90q (211k
>miles) as preventative maintenance.  I noticed about a 500 Hz tone coming from
>the fuel pump shortly thereafter that sounded much louder inside the car than
>outside, but still audible under the car as well.  I took the car back to the
>mechanic that I had replace the pump and he told me to get a new pump in
>immediately, that this one should not sound like that.  He also suggested that
>I replace the rusty accumulator and fuel lines between said pieces.  I had
>ordered the pump from blau and had another pierburg pump shipped.  I also
>bought the new lines and accumulator and took the parts to my mechanic.  He
>replaced these, and the pump was silent at the time of replacement, so I was
>happy.  Now, the new pump has also developed the same 500 Hz tone.
>
>At first, I suspected that there might be something wrong, clogged, etc in the
>fuel system, but the original bosch pump that I had before only had an aubible
>buzz, and worked fine.  Then I noticed that with multiple electricals on
>(defroster, heated seats, headlights, fan, etc.) the pump's tone dropped in
>frequency at idle and came up to the same 500 Hz with engine speed, but at
>idle
>with no auxiliaries on, the pump is getting over 12V.
>
>With the original new pump, I was autocrossing and getting out of first gear,
>the engine stalled, I feel that the system probably vapor locked.  I had also
>had the car lose power at full throttle and lurch around 5500 rpm once before.
>
>With the newer pump, I have noticed that the cold start valve begins
>pulsing/clicking when I give the engine any gas, presumably to richen the
>mixture (oxs replaced 2000 miles ago).
>
>Any btdt with fuel pumps going bad within months of replacement, twice?
>Clogged injectors, not enough power going to the pump, etc?  Do I just
>take the
>car to blau, and have them troubleshoot why their pumps are failing in my car
>(I'm two hours from them)?  Get a bosch pump?
>
>TIA,
>
>Nathan Engelbert
>89 90q (insert annoying tone)
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