This has just been my experience with GM's of the past couple of decades,
mainly in GMC's, Chevy's and Cadillacs, but they have all had fuel pump
whine from the day one.
Never had a fuel pump problem though... my 2000 Tahoe LT 4x4 has 50,000
miles on it and it whines like it did the day I bought it.. no problems...
I just had the pump in my 94 Jimmy replaced. The new one whines,
though it's not as loud as the old one was. I need to replace the
fuel filter anyway...
On Mon, 25 Aug 2003 03:10:08 GMT, "Jeremy Chavers"
I had a OEM replacement put in my 92 S10. It whines quite loudly. I asked
themechanice about it and he said it is fine.
I had a 200x Chevy van pull up beside me one day and I could hear his with
my windows up.
I've got a '99 K2500 that has the same type of whine. I bought the truck
used, and the fuel pump died about 2 months later. I recently had more
problems with fuel delivery, and ended up having to change the fuel tank.
Seems that if your EVAP canister is bad or flaky, it will pull enough vacuum
on the fuel tank to collapse it. My fuel tank was scrunched in about 3
inches deep along the inner edge, and about 2 - 3 inches along the bottom
edge. Couldn't tell by looking at it because of the plastic outer liner
over the tank. This also caused my gas gauge to read incorrectly, since the
bottom of the tank was scrunched up, it made the fuel level sender arm go to
the top of the tank and show about 3/4 full when she was full. It also
seemed to cause an intermittent 'vapor lock' type of problem.
Seems to be for now, I am still slowly trying to troubleshoot the EVAP
system. But until I am finished, I make sure that the filler cap isn't on
very tight. We've also had a week of "cool" weather, so I am not 100%
certain it won't happen again.
My '98 made a loud sound from the day it was new to when I had a premptive
replacement done at 100k a few weeks ago. Now it's silent. Dunno whether to
worry or not -)
Wouldn't call the original noise exactly a "whine" - more like a loud buzzing
muffled by fluid....but I used to wonder what it was until somebody pointed out
For what it's worth, I used to work for a company that made the plastic fuel
tanks for most large Chevy trucks (GMT800) as well as the Dodge Ram trucks,
among others. In quality testing of the tanks before shipping, all the GM
specified pumps seemed to be quite a bit louder than the ones that Dodge
specified. I think it was Denso that made the GM pumps? I hate to say it's
"normal" for them to sound loud, but I think that is/was the case.
Now on the 99 Dodge Ram that I owned, the pump was quiet, until about 24K
miles, when it got really loud, and about a week later failed. When
replaced, it was quiet as could be, and has been ever since, 112K miles
later. Go figure.
And to the comments about the EVAP system collapsing a fuel tank, I highly
doubt this is possible. The vacuum pressure required to do this isn't
reached in an EVAP system. We used to use scrap tanks as step stools. They
do not deform with #200 pounds of weight standing on them, so I'm sure a
vapor return line won't do much either. 26 gallons of gas weighs about 208#
and the tanks don't deform under that load. Part of the tank testing is to
freeze them when filled with water, and then drop the tank and ice inside
from 2 stories up. The tanks must not deform, burst, or leak after that
test to be considered good. Sounds like someone drove over something and
crushed the tank. Just a thought.
Yes, there is enouch vacuum to collapse a steel fuel tank, especially on a
long trip starting with a full tank, AND if you have a faulty fuel tank
pressure sensor that reports overpressure in the tank. The valve will stay
open and the intake manifold will suck as much gasoline fumes as possible.
That along with the fuel pump removing the liquid from the tank and a tight
gas cap will easily do the trick.
When looking through the junkyards for a replacement tank, ALL of them I
found from 98 and 99 models were collapsed in to some degree or another, all
on the inside seam and some on the bottom too. Mine was the worst, about
2-3 inches in on the inside seam and about 1-2 inches along the bottom.
One guy I talked to said he used to be a GM service tech and since the new
emissions laws and design changes in 96, he saw several collapsed fuel tanks
that he believed was due to the EVAP system.
Sounds correct... Had a similar problem in a VW...
A girlfriend had an 85 VW rabbit that collapsed it's tank when we went
on a trip (after having the car for over a year). We ran out of gas
several times before we realized what had happened. It messed up the
fuel-gage too. Replaced the tank and on the next trip it happened
again. After that we used the trip-odometer to refill after every 100
mi (a good tank sent that car over 300). When opening the gas-fill-cap
there was alwayse a huge sucking sound if it was driven >10 mi before
the gas station. The cap got realy tight too.
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