89 Mustang 5.0 fuel pump noisy

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

donsjunkk@hotmail.com - 24 Jun 2006 21:06 GMT

Hi - I just bought a very stock 5.0 LX convertible that has been
sitting for about a year before I bought it - everything is fine except
that I notice that the fuel pump is noisy all the time - it makes a low
buzzing noise all the time that reminds me of the seat belt warning
buzzer from the 72 valiant my mother used to own

Basically I am wondering if this is a sign of a failling pump - I had a
fuel pump go in a dodge van and it basically made a loud humming noise
before it went

Thanks for any assistance or advice

Reply to this Message

Kristen - 24 Jun 2006 21:47 GMT

> Hi - I just bought a very stock 5.0 LX convertible that has been
> sitting for about a year before I bought it - everything is fine except
[quoted text clipped - 7 lines]
>
> Thanks for any assistance or advice

Chances are the pump is working too hard.
Try changing the inline fuel filter (if it has one) first and see if it
goes away.
If not,unless the noise is normal for this model, I don't know, replace
the pump or you will be stranded shortly.

A mechanic gave me a tip about extending the life of electric, in the
tank, pumps and that is never let your fuel level go below 1/2 or at worst
1/4 tank because the fuel acts as a coolant for the pump.
Heat and clogged fuel filters are the great destroyer of fuel pumps!

Reply to this Message

Backyard Mechanic - 25 Jun 2006 20:07 GMT

>> Basically I am wondering if this is a sign of a failling pump - I had
>> a fuel pump go in a dodge van and it basically made a loud humming
[quoted text clipped - 11 lines]
> tank, pumps and that is never let your fuel level go below 1/2 or at
> worst 1/4 tank because the fuel acts as a coolant for the pump.

I still say this is crap. It's the fuel flowing THROUGH the pump that
cools it. .. the advice about (partially) clogged filter is good,
though, for exactly that reason.

> Heat and clogged fuel filters are the great destroyer of fuel pumps!

Signature

Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

Reply to this Message

Dana Bush - 25 Jun 2006 21:35 GMT

>>> Basically I am wondering if this is a sign of a failling pump - I had
>>> a fuel pump go in a dodge van and it basically made a loud humming
[quoted text clipped - 17 lines]
>
>> Heat and clogged fuel filters are the great destroyer of fuel pumps!

I tend to agree, but it can't hurt :)

The fuel flowing through the pump goes right through the motor (believe it
or not, sparks from the electrical motor and all!) and acts as a coolant
as well as a lubricant.

The reason the entire thing doesn't explode is because there is no O2 in
motor.

Every pump I have ever changed is covered by a neoprene sock which doesn't
absorb liquid very well as far as I can tell. IOW it's not soaking wet to
the point where you have to wring it out like a sponge when you remove
the pump from the tank so how much fuel really comes in contact with the
outside of the pump?

I dunno???

At any rate, running a tank low is a bad idea in any case.
A clogged fuel filter will cause pump whine and ultimate failure as well.

Reply to this Message

WindsorFox - 25 Jun 2006 03:42 GMT

When the pump in my 89 LX got loud enough to notice all the time it
lasted about another 8 months and started going bad. When you change it,
go ahead and use a high output, because when you do decide to do
anything to it you don't want to have to do it again. Pump replacement
is really quick and easy, it's getting the cover on and of that's a real
PITA.

Signature

"I've answered more than enough of
your ludicrously silly whines..." - Steve Linford

Reply to this Message

Ritz - 26 Jun 2006 01:08 GMT

Yeah, when they start to whine, I'd replace it before you get stuck.
Even under the best of circumstances the OEM pumps on the Fox mustangs
were somewhat loud, but that seems overly loud and a legitimate source
of concern.

Cheers,

Reply to this Message

Fred V. - 04 Jul 2006 21:53 GMT

I replaced mine a few years ago. Too noisy. Nice and
quiet since. I would also replace the relay under the
driver seat.
Fred
89 LX

Reply to this Message

SteveO - 05 Jul 2006 01:12 GMT

> I replaced mine a few years ago. Too noisy. Nice and
> quiet since. I would also replace the relay under the
> driver seat.
> Fred
> 89 LX

That's a very good piece of advice because pumps that are working too hard
can draw more current and fry the contacts on the relays controlling them.

Reply to this Message