gegnot

My fuel fuel gauge went out a couple months ago, the dealer replaced the sending unit (still under warranty). Gauge worked until I filled up the car and gauge only registered 3/4 of a tank. When the "low Fuel" warning starts, the tank will only take about 12 gal., so I know the tank is filling up. Went back to the dealer and they replaced the sending unit again, still didn't fix the problem. This time they removed the gauge cluster and replaced the fuel gauge and guess what? The gauge still only reads 3/4 of a tank when full.

Any suggestions? The dealer just seems to be shooting in the dark and I'm tried of driving Chevy Cobalt loaners.

ronwc

Common problem, Techron usually fixes - you may want to search this forum -

lucky131969

I'm curious, if the sending unit has been replaced twice, how will techron fix the problem?

LoneStarFRC

You say they replaced "the sending unit"? There are two. One in each tank.

screw991le

It depends on what you are using for fuel.

Here are the TSBs



Document ID# 1547862
2000 Chevrolet/Geo Corvette


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Info - Top Tier Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns) #04-06-04-047A - (Aug 31, 2004)
Top Tier Detergent Gasoline (Deposits, Fuel Economy, No Start, Power, Performance, Stall Concerns)
2005 and Prior All General Motors Passenger Cars and Trucks (U.S. Only)

2003-2005 HUMMER H2

This bulletin is being revised to identify the gasoline brands that currently meet the Top Tier Detergent Gasoline Standards. Please discard Corporate Bulletin Number 04-06-04-047 (Section 06 - Engine).

A new class of gasoline, called Top Tier Detergent Gasoline, will be appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by four automotive companies. A description of the concept and benefits of Top Tier is provided in the following question and answer section.

What is Top Tier Detergent Gasoline?
Top Tier Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by four automotive companies that exceed the detergent requirements imposed by the EPA.

Who developed Top Tier Detergent Gasoline standards?
Top Tier Detergent Gasoline standards were developed by four automotive companies: BMW, General Motors, Honda and Toyota.

Why was Top Tier Detergent Gasoline developed?
Top Tier Detergent Gasoline was developed to increase the level of detergent additive in gasoline. The EPA requires that all gasoline sold in the U.S. contain a detergent additive. However, the requirement is minimal and in many cases, is not sufficient to keep engines clean. In order to meet Top Tier Detergent Gasoline standards, a higher level of detergent is needed than what is required by the EPA. Also, Top Tier was developed to give fuel marketers the opportunity to differentiate their product.

Why did the four automotive companies join together to develop Top Tier?
All four corporations recognized the benefits to both the vehicle and the consumer. Also, joining together emphasized that low detergency is an issue of concern to several automotive companies.

What are the benefits of Top Tier Detergent Gasoline?
Top Tier Detergent Gasoline will help keep engines cleaner than gasoline containing the "Lowest Additive Concentration" set by the EPA. Clean engines help provide optimal fuel economy and performance and reduced emissions. Also, use of Top Tier Detergent Gasoline will help reduce deposit related concerns.

Who should use Top Tier Detergent Gasoline?
All vehicles will benefit from using Top Tier Detergent Gasoline over gasoline containing the "Lowest Additive Concentration" set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from use of Top Tier Detergent Gasoline.

Where can Top Tier Detergent Gasoline be purchased?
The Top Tier program began on May 3, 2004. Some fuel marketers have already joined and have introduced Top Tier Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the Top Tier standards.

Gasoline Brands That Currently Meet Top Tier Detergent Gasoline Standards
As of August 15, 2004, the following gasoline brands meet the Top Tier Detergent Gasoline Standards:

Chevron Chevron has markets in 29 states in the West, Southwest and South, as well as in Alaska and Hawaii. ALL grades of Chevron with Techron gasoline meet Top Tier Detergent Gasoline Standards.
QuikTrip (not to be confused with Kwik Trip) QuikTrip operates convenience stores and travel centers in a number of metropolitan areas:
Tulsa, OK
Springfield, MO
Kansas City, MO and Kansas City, KS
Wichita, KS
Des Moines, IA
Omaha, NE
St. Louis, MO and St. Louis, IL
Atlanta, GA
Dallas-Ft. Worth, TX
Phoenix, AZ
Bartlesville, OK
Miami, OK
Vinita, OK
Columbia, MO



Document ID# 1351974
2000 Chevrolet/Geo Corvette


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Erratic Fuel Gauge Reading (Reprogram the PCM) #02-06-04-010A - (Jun 27, 2003)
Erratic Fuel Gauge Reading (Reprogram the PCM)
1999-2002 Chevrolet Corvette

This bulletin is being revised to add models and update the Correction and Warranty Information. Please discard Corporate Bulletin Number 02-06-04-010 (Section 06- Engine).

Condition
Some owners may comment about the fuel gauge intermittently indicating an empty reading and then return to the correct fuel level indication.

Cause
This condition may result when fuel blends containing aggressive sulphur compounds react with the fuel sender assembly, which may result in voltage spikes being induced on the fuel level signal to the PCM. Use of another fuel blend may reverse this reaction and return the system to normal operation.

Correction
Reprogram the PCM with the new service calibration which is available in the June 2003, Techline® TIS release sent to the dealers on 6/28/03. Use the TIS Version 7 or later data update.

Warranty Information
For vehicles repaired under warranty, use: