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Feul gage bounces only in park


perrosinpata
08-21-2004, 03:31 PM
I have a 2000 blazer an dI replaced the sending unit but now it only bounces in park.Where is the ground ?

patience
08-21-2004, 04:23 PM
I dont know if this pertains to your model but here is the info for a similar problem with my car.

Engine Controls - Excessive Fuel Gauge Fluctuation

Bulletin No.: 03-08-49-014A

Date: October 02, 2003

TECHNICAL

Subject:

Fuel Gauge Fluctuates Between E and 1/4 Tank, Goes From 1/4 to Empty Too Quickly, Excessive Empty Fuel Reserve (Reprogram PCM)

Models:
2001-2003 Chevrolet Blazer
2001 GMC Envoy
2001-2003 GMC Jimmy

Supercede:

This bulletin is being revised to add condition information. Please discard Corporate Bulletin Number 03-08-49-014 (Section 08 - Body and Accessories).

This bulletin contains three different conditions depending on the model year of the vehicle involved.

Condition # 1 (2001 4-Door Only)

Some customers may comment that the fuel gauge goes from 1/4 to empty too quickly.

Condition # 2 (2002 4-Door Only)

Some customers may comment about excessive empty fuel reserve.

Condition # 3 (2003 2-Door and 4-Door)

Some customers may comment that the fuel gauge fluctuates between E and 1/4 tank.

Correction

Important: In order to select the correct calibration on some vehicles, you must first identify the cluster part number. This can be done using the Tech 2. DO NOT REMOVE THE CLUSTER.

A new service calibration has been released to correct these conditions. Reprogram the PCM using the new service calibration, which was available from Techline starting August 25, 2003 on the TIS2000 version 9.0 or later. This calibration is an electronic calibration and is not available from GMSPO.

BlazerLT
08-22-2004, 12:38 AM
I have a 2000 blazer an dI replaced the sending unit but now it only bounces in park.Where is the ground ?

Bounces in park? What do you mean?

patience
08-22-2004, 10:37 AM
Same thing happens to my 02k. It bounces all over the place from empty to full.

GOing to bring it in for repair monday. I will post their findings.

perrosinpata
08-22-2004, 01:04 PM
bounces from empty to full ? It is probably your sending unit.

perrosinpata
08-22-2004, 01:05 PM
I replaced the sending unit and now it only fluctuates in park from E-1/4 tank.Can I reprogram it myself?

BlazerLT
08-22-2004, 02:23 PM
Does it do this when you are coming to a stop and putting it into park , or if you start it up in the morning it will do this?

perrosinpata
08-22-2004, 10:16 PM
Yes.

BlazerLT
08-22-2004, 10:46 PM
So you start up the engine and it will sit there and bounce?

This might be completely normal seeing you getting into the truck might have caused the gas in the tank to slosh from side to side a bit and when you are coming to a stop the gas will definitely be moving.

How far does the gauge move?

perrosinpata
08-22-2004, 11:20 PM
it fluctuates from E to 1/4

BlazerLT
08-22-2004, 11:22 PM
if you sit still will it gradually calm down?

perrosinpata
08-23-2004, 08:52 AM
Yes.But it doesnt bounce around in Drive?

patience
08-23-2004, 08:59 AM
It bounces in both park and drive, but more so when your sitting still.

A few times it has happened when going full speed, but mostly it happens while stitting in my drive way which is on an incline.

BlazerLT
08-23-2004, 01:09 PM
Yes.But it doesnt bounce around in Drive?

Does it bounce up and down quickly or does it take a minute or so to go up and down?

perrosinpata
08-23-2004, 02:15 PM
It takes a minute to settle.

BlazerLT
08-23-2004, 02:17 PM
This is normal.

perrosinpata
08-23-2004, 02:25 PM
It wasnt doing it before?

BlazerLT
08-23-2004, 05:26 PM
Does it bounce violently or very slowly over a minute or two.

perrosinpata
08-24-2004, 12:36 PM
very slowly

BlazerLT
08-24-2004, 12:57 PM
You see, when you put a vehicle in park you have just come to a stop right?

Also, when you get into a vehicle, the truck will lightly rock from side to side as you climb into the driver's seat.

Both scenarios lead to the small amoutn of fuel left in your tank at that level to slosh back and forth a bit until it has been still and can settle.

When I come to a stop light with a low amount of fuel, the level of the tank can be seen to chage as the fuel is forced to the front while stopping.

As said before, this is completely normal and you cannot compare this sending unit doing to the last one that did not.

Remember, the last sending unit was defective so it is not exactly a good comparative sample.

perrosinpata
08-25-2004, 08:42 AM
Tankyou for being so helpful and patient.

BlazerLT
08-25-2004, 10:57 AM
Ur velcome. ;)

mike2004tct
08-25-2004, 11:04 AM
[QUOTE=BlazerLT]
When I come to a stop light with a low amount of fuel, the level of the tank can be seen to chage as the fuel is forced to the front while stopping.


When my '97 LS gets low on fuel- about 3/4 full, the gauge goes all the way to full even when the tank is empty and I get stranded in podunkville, which is where these POS sending units were made.Not to mention the windshield wipers only work in dry wheather. When it rains, they don't work.

I missed out on the special bulletin (wiper) by 2 months, so I'll have to replace that and the fuel pump myself before I try to unload the thing. (Not in a hurry to sell it, and definately not in a hurry to spend $400 for the fuel pump, and $60 for the wiper cover unit)

GM-Chevy customer service sent me a nice letter stating they're not responsible for mail notices that don't reach the intended receipient,so don't bother us again with your piddly complaints. (I'm the original owner on the truck, it only has 32K miles, and has been recalled 3 other times for upper ball joints,seat belts, and fire-prone door mirrors.

BlazerLT
08-25-2004, 11:11 AM
don't get the repair done at a Chevy dealership.

US$500 for an installed sending unit is too expensive. Check around for better prices.

mike2004tct
08-25-2004, 11:29 AM
The prices I gave are my part costs ($335 for the pump at NAPA, $58.00 for the wiper motor cover from Chevy). The dealer will add anothe 25-50% onto NAPA's part cost.

As I said, I'll eventually do the repairs myself, I'm not about to give my local dealer $90.00/hour labor charges which would add another $300.00 onto the price. There should be a recall on this, as it can be a safety hazard.(I've filed my compaint with the NHTSA, my gauge hasn't worked going on three years.)

Numerous posts in this forum about people paying over $600.00 to get their fuel gauges working through the stealer/dealers.
This particular model has the sending unit integrated into the pump, the sending unit as a separate piece is not available.

BlazerLT
08-25-2004, 11:41 AM
Ouch, they are expensive.

Can't you just pop a used one in? I would.

mike2004tct
08-25-2004, 12:06 PM
Ouch, they are expensive.

Can't you just pop a used one in? I would.

Sure could.That's always a possibility, but unlikely for me. I only drive the truck in winter or rainy wheather, so using the trip meter to estimate fill-up time is ok for me.(Did I mention the crappy-wipers-dont-work-when-it-rains symptom)

Eventually my daughter will get this vehicle (needs to go another 4 months on the temp license,can't drive by herself until that period is up), and this is when I'll probably install a new unit. (Dad, I need $5.00 for gas - that'll screw up the trip meter method)

I'd hate to put a used pump in only to have the same problem. After all, I don't want to be dropping the fuel tank on a regular basis. The truck is in very good condition, so I'll opt for new parts to keep it that way and continue to complain about the poor customer service from Chevy.

OK, I'm done ranting.
Mike

BlazerLT
08-25-2004, 12:28 PM
For one, don't get your service done at the dealership.

Use a private garage and save big money. They are all mechaincs.

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