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  1. #1
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    423

    Default Fuel Level Sensing Flaky

    This is a 2013 XC70 T6, out West, virtually no rust, 114K miles. Over the past year, the fuel level sensing has gone flaky.
    After filling the tank, it will show 1/2 full. But, a day later, it will show 3/4 full. During a drive, the display might start at 3/8 full, and then climb to 3/4 full.

    I got my new iCarSoft Volvo/Saab V2.0 scanner, and it's seeing a

    P134600 "Fuel Level Sensor B Circuit, General Failure. No sub type information"

    Assuming this is a flaky electronic connection, can anyone detail the harness connections between the Fuel Sender,
    Fuel Tank Module, and upstream path to ECM/CEM? thanks
    Attached Thumbnails Attached Thumbnails Fuel Level Sensing Error.jpg  
    2013 XC70 T6 Flamenco Red (hers)
    2015 XC70 T6 Seashell Metallic (his)
    past: 13 Volvos going back to '74 242 sedan

  2. #2
    Join Date
    Dec 2016
    Location
    NC
    Posts
    15

    Default

    I have had a strong dose 20 plus ounces of Techtron Concentrate fuel cleaner actually clean the contacts of the float switch contact strip. I saw this in a TSB but I cannot remember which manufacturer before. Might be worth a try.

  3. #3
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    423

    Default

    I have more info on this problem. The gas tank is nearly full.

    When I start up the engine, the console bar shows the correct tank level 7/8, and the "miles to empty tank" shows 380 miles (correct).

    About 15-20 seconds later, the tank level bar spontaneously jumps to 1/2 tank, while "miles to empty tank" holds at 380 miles.

    After another 20 sec, "miles to empty tank" jumps down to 200 miles (would be correct if tank were 1/2 full).

    Has anyone dealt with this issue? What does the :20 sec delay until the tank misread suggest? It is 100% repeatable.
    2013 XC70 T6 Flamenco Red (hers)
    2015 XC70 T6 Seashell Metallic (his)
    past: 13 Volvos going back to '74 242 sedan

  4. #4
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    The fuel level sender in the left side/ejector side of the tank is shot. You need a new fuel tank.
    Our Most Probable Fate Is Death !!!

  5. #5
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    423

    Default

    Quote Originally Posted by Aviator View Post
    The fuel level sender in the left side/ejector side of the tank is shot. You need a new fuel tank.
    Can you explain a little bit more how you arrived at that conclusion?
    2013 XC70 T6 Flamenco Red (hers)
    2015 XC70 T6 Seashell Metallic (his)
    past: 13 Volvos going back to '74 242 sedan

  6. #6
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    The sender on the left side of the tank gets fouled with dirt and starts to stick or break. There is no access to that part of the tank...only the right side where the fuel pump is. Also, the plastic fuel lines in the tank sometimes kink and break. The tank is non-serviceable, except for the fuel pump. It's not a real frequent issue...maybe see 3 or 4 a year in the P3 cars.
    Our Most Probable Fate Is Death !!!

  7. #7
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    423

    Default

    Quote Originally Posted by Aviator View Post
    The sender on the left side of the tank gets fouled with dirt and starts to stick or break. There is no access to that part of the tank...only the right side where the fuel pump is. Also, the plastic fuel lines in the tank sometimes kink and break. The tank is non-serviceable, except for the fuel pump. It's not a real frequent issue...maybe see 3 or 4 a year in the P3 cars.
    I take it you work on P3s. I'm perplexed because everything I'm seeing in online documentation for 2013 XC70 AWD "saddle" fuel tank indicates a single portal (fuel pump and level sender integrated into the same assy. 31372880). [ I previously had a 2004 XC70, and that had a saddle tank had 2 portals, fuel pump on passenger side, level sender on passenger side - and convenient access holes in the floor. ]

    I agree that this P3 AWD makes it prohibitive to repair anything with the fuel tank, including the Fuel Pump Control Module (which they chose to mount on TOP of the tank). I would have to cut an access hole in the flooring to get to the module, and a different hole to get to the fuel pump. It's not that serious a problem, so I'll just live with it, and curse the engineers in Sweden for poor maintenance-design of the fuel pump / control module.

    Thanks for taking the time to respond.
    2013 XC70 T6 Flamenco Red (hers)
    2015 XC70 T6 Seashell Metallic (his)
    past: 13 Volvos going back to '74 242 sedan

  8. #8
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    "I'm perplexed because everything I'm seeing in online documentation for 2013 XC70 AWD "saddle" fuel tank indicates a single portal (fuel pump and level sender integrated into the same assy."

    That is correct. The level sender on the left side is not shown because it is not serviceable. Your 2004 has a level sender on the left side as well...hence the access cover. Plus, the opening is used to pull the fuel transfer tube and ejector over from the right side/pump side.
    Our Most Probable Fate Is Death !!!

  9. #9
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    423

    Default

    Quote Originally Posted by Aviator View Post
    "I'm perplexed because everything I'm seeing in online documentation for 2013 XC70 AWD "saddle" fuel tank indicates a single portal (fuel pump and level sender integrated into the same assy."

    That is correct. The level sender on the left side is not shown because it is not serviceable. Your 2004 has a level sender on the left side as well...hence the access cover. Plus, the opening is used to pull the fuel transfer tube and ejector over from the right side/pump side.
    So, the 2013 AWD saddle tank has 2 level senders, one on each side?...the left side sender welded into the tank? OK.

    Still learning about these cars (have 2 of 'em).
    2013 XC70 T6 Flamenco Red (hers)
    2015 XC70 T6 Seashell Metallic (his)
    past: 13 Volvos going back to '74 242 sedan

  10. #10
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    "So, the 2013 AWD saddle tank has 2 level senders, one on each side?...the left side sender welded into the tank?"

    Yep! All Volvo saddle tanks have a level sender on each side.

    "Still learning about these cars (have 2 of 'em)."

    The more you learn about them, the more you'll realise that your '04 was a much better car. The P3 cars are Fords. And, the P5 cars are even worse.
    Our Most Probable Fate Is Death !!!

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