Re: [DML] Noise from fuel pump
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Re: [DML] Noise from fuel pump

Actually these are very legitimate questions as I have
just had some similar experiences the last 24 hours.

It is normal for the pump to make a bit of noise in
position II of the ignition.  That is called "priming
the pump" and is completely normal.  It is also
completely normal for the pump to NOT make that noise
once every so often.  

As for the pump to be buzzing while the car is
running; this can vary depending on who you ask.  The
pump has two lines - main feed and return.  The main
feed is sending - what - 29 gallons of fuel an hour at
60-70 psi?  To say the least - alot of buzzing from
that line.  The return line makes very little in
comparison.  To hear a little buzzing is normal - at
least to me.  If you hear a lot of buzzing - loud to
the point that you wonder if bystanders can hear it as
you're driving by - or you feel any vibrations in the
AC console plate, that is abnormal.  Possible causes
(in my experiences...this is not a straight and true
"only" scenario here):

1.  Most probably the main feed line is rubbing up
against the underbody of the car, sending the
vibrations to the A/C console plate.

2.  Also most probably, one of the two fuel hoses is
kinked (bent, as if you squeezed a water hose over
itself) and the pressure buildup is causing the pump
to work harder because it's getting less fuel to
circulate through the system.

3.  Miscellaneous reasons could be dirty electrical
pigtail connections, faulty/failing RPM relay, heat
from the weather around you etc etc.

Recently on a 150 mile trip back from Monroeville, Al
- my pump was buzzing badly to where I could feel it
against the A/C console plate....

The steps I took were gaining access to the pump, 1.
rerouted the two hoses and made sure they had no bends
in them...2.  Routed the main feed hose away from the
underbody...3. Cleaned my fuel pump filter...4. 
Cleaned/Di-electric greased my RPM relay
connections...5.  Jumped the RPM relay and let the
pump run for a good two minutes to ensure nothing was
sticking in the pump motor..6.  Made sure the fuel
pump cover/boot was completely tightened and fastened
down securely.

So good - another 200+ miles today with not a

Your questions are completely legitimate and shows you
have a desire to learn and understand what's going on.
 That will partly get you VERY far with understanding
how the car works...the other part that will help you
is actually doing this kind of stuff...whether it be
for practice or when the car breaks.  When that is is
up to you =P.


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