My 2000 Chev S10 4x4 truck just had it's fuel pump replaced about 15 months
ago. I went to Advanced Auto and bought and had one installed. Now this
one is acting up. The truck will not start in the morning, I have to spray
a little bit of ether to get it going. I'm going to replace it with an
ACDelco but I can't determine if my VIN = W. My VIN is 1GCDT19W1Y8179944
obviously there's a W in there - but I just want to confirm it with you
Have you changed fuel filter recently? ALso those pumps will not last
long if you run your tank low a lot. You really want to keep it above
1/4 most of the time as the fuel cools and lubes pump.
Yes....we all know that....but what happens when
a fuel pump is enclosed in a module and the module
retains it's own fuel level right until the fuel tank
goes completely empty? This is the problem when
people give out dated advice to the folks on these
newsgroups looking for "up to date" information on
how to diagnose and repair their "modern" vehicle.
Of course, if you haven't pulled one of these out in
years, you wouldn't know this, and continue to give
erroneous information to people, such as "you need
to keep the fuel tank at least at 1/4 tank or the pump
can fail due to lack of cooling". Totally incorrect, and
out of date information!
If it starts up with starting fluid and then runs fine I doubt it's the
pump. More like the regulator or injector is leaking down. Or the fuel
pump relay isn't working.
Do you hear the pump when you turn the key ON without trying to start
the engine? If not the relay is probably bad. Any problems with bad
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I've been having the same problem. First noticed that it would not
start when voltage gage showed 10 or under. If I throw the charger on
and up the voltage to 14 it pops right off. Could this be just a weak
pump that increases the start up pressure with a higher voltage to the
pump? After it runs for a while there is no problem on a restart,
however if it sits for an hour or so it acts up again. Sometimes
cycling the iginition key on for a couple of seconds and off again seem
to help. Suspect I am increasing fuel pressure by doing this. Fuel
filter is only 6 months old. Fuel pump was replaced by a shop about
1.5 years ago while on a road trip ($700+) when the original one
crapped out. Started noticing this problem not long after but never
related the two. First symptoms was hard starting when temperatures
were cold. After a while it didn't matter if it was cold or not.
I have been told by a local shop owner that he has experienced problems
with aftermarket fuel pumps from several suppliers and not only gets GM
pumps. Also stated when replacing pumps to replace the wires that are
included with the new pump even if they look good.
I am actually not sure if it is the pump or the power to it. I have
recorded a voltage drop at the fuse box and at the cigarette lighter
socket dropping to 9 to 7 volts when the battery voltage is 11 or
higher when cranking the engine. It will not start if I keep cranking.
I have to hit the key for about a second and back off -- sometimes it
will catch, other times not, but I do notice the voltage drop every
time. I have had the battery checked out twice and tried other
batteries with the same result. Voltage measured at the cigerette
lighter must be 10.5 or higher before it starts.
The voltage drop is not coming from the starter, already replaced it
and didn't make any difference. Is this kind of drop normal during
starting? What else is getting power when the key is in the starting
position? Will a weak pump just need more voltage to deliver the
Thanks for any helpful replies.
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