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Sep 11, 2009 | 07:43 AM

#21

Bowtie_Brigade

Instructor

Joined: Aug 2009

Posts: 181

Likes: 1

Quote:

Originally Posted by kg54trains

Meet a Senior GM Tech at Carlisle in a AM seminar. He stated for the fuel gauge problem in a C5 use the 20oz bottle of Techron Plus and also recommended BK44 which is only at shops and not available to the public.

Interesting as they're both just detergent/solvent type fuel additives. In my 30+ years of wrenching, I've never heard of a "sulfur" problem in any diagnosis of a vehicle problem. Is it really a sulfur problem, or can the cause be attributed to old gasoline causing the contacts to varnish, or perhaps an Ethanol or water issue?

F.Y.I. - Texaco uses Techron in their gasoline; their prices are typically cheaper than Chevron.

Sep 12, 2009 | 01:29 AM

#22

striper

Le Mans Master

Joined: May 2005

Posts: 6,366

Likes: 249

From: Fort Lauderdale, Florida

On the C5registry.com site this problem was addressed by one of the members in contact with someone at GM. The problem is a sulphur deposit issue on the fuel gauge sender contacts. It is recommended to try the Techron before going to replace any parts. A couple of years ago also had the problem start. As soon as the first time I noticed the problem occurring, I added a couple of bottles of Techron. The problem went away immediately and fortunately it has never returned.

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