Service Fuel System Warning
Thread Starter
Instructor
Joined: Apr 2007
Posts: 117
Likes: 1
From: Old Hickory TN
Service Fuel System Warning
I got the Service Fuel System message in the DIC and the gas gauge is showing empty. I have read that this was a problem on the C5 and early C6's but don't know if this issue was fixed or not. Mine is a '07 with 2300 miles when it happened. I know it was the Fuel Sending Unit but the thread in C6 FAQ is from 2005.
The bigger question I have, is there a list of things to check to see if I can get it back working before I take it to the dealer?
The bigger question I have, is there a list of things to check to see if I can get it back working before I take it to the dealer?
Burning Brakes
Joined: Apr 2007
Posts: 1,084
Likes: 0
From: Santa Clarita California
I had the same problem. Pulled the battery and that was a temp fix. Then I used an HP Tuner to clear the codes. But none of this kept it from reoccurring. This sounds exactly like my problem. It is caused by corrosion of one of the sending units and it occurrd when I got to 1/3 tank each time. I did not want to take it to the dealer so here's how I solved the problem.
First I put in a bottle of Techron concentrate. Then I filled up with Shell 91, a Top Tier gas. I used to run only Mobil when this occurred after 6,000 miles. I thought Mobil was a top tier, but it's not. Then I never let it get much lower than 1/2 tank for a few weeks. Then one day I decided to test it and it ran to E without a problem. I bet I did not need to go that long, but I wanted to try to clean the sensors and didn't have time to fool around with pulling the battery every tank. Now I'm only using top tier gas, which is Chevron or Shell where I'm located.
First I put in a bottle of Techron concentrate. Then I filled up with Shell 91, a Top Tier gas. I used to run only Mobil when this occurred after 6,000 miles. I thought Mobil was a top tier, but it's not. Then I never let it get much lower than 1/2 tank for a few weeks. Then one day I decided to test it and it ran to E without a problem. I bet I did not need to go that long, but I wanted to try to clean the sensors and didn't have time to fool around with pulling the battery every tank. Now I'm only using top tier gas, which is Chevron or Shell where I'm located.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
I had the same problem. Pulled the battery and that was a temp fix. Then I used an HP Tuner to clear the codes. But none of this kept it from reoccurring. This sounds exactly like my problem. It is caused by corrosion of one of the sending units and it occurrd when I got to 1/3 tank each time. I did not want to take it to the dealer so here's how I solved the problem.
First I put in a bottle of Techron concentrate. Then I filled up with Shell 91, a Top Tier gas. I used to run only Mobil when this occurred after 6,000 miles. I thought Mobil was a top tier, but it's not. Then I never let it get much lower than 1/2 tank for a few weeks. Then one day I decided to test it and it ran to E without a problem. I bet I did not need to go that long, but I wanted to try to clean the sensors and didn't have time to fool around with pulling the battery every tank. Now I'm only using top tier gas, which is Chevron or Shell where I'm located.
First I put in a bottle of Techron concentrate. Then I filled up with Shell 91, a Top Tier gas. I used to run only Mobil when this occurred after 6,000 miles. I thought Mobil was a top tier, but it's not. Then I never let it get much lower than 1/2 tank for a few weeks. Then one day I decided to test it and it ran to E without a problem. I bet I did not need to go that long, but I wanted to try to clean the sensors and didn't have time to fool around with pulling the battery every tank. Now I'm only using top tier gas, which is Chevron or Shell where I'm located.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,540
Likes: 4,020
From: Cape Coral, Florida
You will not pass your state emission with the check engine light on…if you take your car to your friendly auto parts store they should be able to tell you what code is turning the light on with their scan tool.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
I guess I am better off when the light is not on because it doesn't always come on (Check Engine light) when fuel guage acts up.
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
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