Gas gauge acting up

[Falcon_LS]

Got a slight issue with my Grand Marquis, which started last night. I had half a tank of gas, and the car was left to sit for a couple of hours. When I started her up, the gauge was reading full. I checked my ScanGauge-II and the FLV gauge was reading 1.00 (full).

Thought it was pretty weird, but I drove off and noticed the gauge was now reading 1/8 on the gauge and 0.8 on my SG-II. It kept dropping and after 10 minutes or so, it read half on the gauge and 0.54 on the SG-II, which was the correct reading before the car was parked.

Not sure if this has anything to do with it, but I switched from high sulfur gas (500 ppm) to Euro V gas (10 ppm sulfur limit) recently.

 

[GMBoy]

Sulphur is the killer of fuel gauge senders that live in the tank. Techron is one of the only gas additives proven to clean the sulphur off the contacts and fix the gauges most of the time. There is even a bulletin put out by GM about using Techron.

I'd run a good dose or 2 of Techron and see if it's enough to clean up the contacts and make your gauge work again. Maybe, the new gas is doing some cleaning too??

 

[GearheadTool]

Do you have Seafoam in Kuwait?

 

[antiqueshell]

Techron is the correct product for this job, it has been proven to remove sulfur build up on the gas tank sensor probes.

 

[LeakySeals]

Add another vote for Techron Concentrate Plus. Check out this overview link from Chevron where the FSU is discussed.

http://www.openroadpodcast.com/pdfs/CGLMediaTour.pdf

 

[Falcon_LS]

Thanks for the input!

I'm afraid neither Seafoam or Techron is available to me, and cannot be shipped from the States considering their very nature. Are either of these good enough for the job:

European STP Fuel System Cleaner

Liqui Moly Fuel Injection Cleaner

 

[Falcon_LS]

Think I may be onto something here:

Originally Posted By: NHSilverado
Actually, anyone with a GM truck should be running Techron Plus every 3-5K. It not only is one of the best fuel system treatments on the market(GM actually relabels it and sells as theirs) but it also cleans and helps to protect the sending unit from the harmful sulfur in the fuel. SeaFoam does not do this nor do most fuel system cleaners.


Does anyone know which one this is, or have a part number? We get the Canadian sourced ACDelco Fuel Injector Cleaner in the white bottle, but I doubt it's the same one. Maybe this one's under the "Genuine GM" label?

 

[Falcon_LS]

Answered my own question in that very thread:

Originally Posted By: elcamino
GM Fuel System Treatment PLUS
GM Fuel System Treatment PLUS, P/N 88861011 (for U.S. ACDelco®, use 88861013) (in Canada, 88861012), is now available.

 

[LeakySeals]

Originally Posted By: Falcon_LS
Answered my own question in that very thread:

Originally Posted By: elcamino
GM Fuel System Treatment PLUS
GM Fuel System Treatment PLUS, P/N 88861011 (for U.S. ACDelco®, use 88861013) (in Canada, 88861012), is now available.

Look what I found in the MSDS !

PRODUCT INFORMATION
Product Name: GM FUEL SYSTEM TREATMENT PLUS
External Keys:
88861011 Distributable Material (Part #)
88861013 Distributable Material (Part #)
FUEL SYSTEM
TREATMENT
PLUS
Primary Tradename - Distributable Material
88861262 Distributable Material (Part #)
10-3004 Distributable Material (Part #)
MANUFACTURER INFORMATION
Manufacturer: Chevron Products Company Global Lubricants
Address:
6001 Bollinger Canyon Road USA California 94583 San Ramon

 

[bandz7]

My dad's 2001 Sierra (GMC) is having some gas gauge issues. I just picked up some BG44K on ebay. From what I've read on here and seen on Motorweek, it could help with the sulfur issues.

 

[Clevy]

I've seen tc-w3 help the sending units in the tank. If it's a sulfur issue I think Techron,and maybe regane may be the correct product for you.

 

[antiqueshell]

Originally Posted By: Clevy
I've seen tc-w3 help the sending units in the tank. If it's a sulfur issue I think Techron,and maybe regane may be the correct product for you.


Anything with high levels of PEA is going to be the most effective product for the sulfated sender coating removal.

Techron Concentrate
Redline LS-1
Gumout Regane Complete

 

[01rangerxl]

Originally Posted By: Falcon_LS
Answered my own question in that very thread:

Originally Posted By: elcamino
GM Fuel System Treatment PLUS
GM Fuel System Treatment PLUS, P/N 88861011 (for U.S. ACDelco®, use 88861013) (in Canada, 88861012), is now available.


If you can get it, this is much easier than replacing the sending unit if it works.

It seems like Techron is starting to clear up my fuel gauge issue (intermittently goes way past full, throws CEL for "fuel level sensor circuit malfunction"). It was doing it almost every other time I started the truck, but is now much less frequent. I added a bottle of the concentrate after the issue appeared, and have been using only gas with Techron in it. I'll add another bottle at the next fillup.