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The Low fuel light is flashing on a full tank

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  • #31
    I Think your tank solenoid valve is sticking. $$$$ the parts about $1000 and about 4 hours labor.

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    • #32
      For a temporary fix, see post #4 here:
      http://www.cngchat.com/forum/forum/g...bad-tank-valve

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      • #33
        SCChris

        Hi, you had written on a post a long time ago about replacing a temp sensor to repair the blinking fuel gauge. Was that in the trunk or under the hood? If in the trunk were you able to replace it without dealing with pressure on the system?

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        • #34
          Just created another post about having this very same problem. My car (2008 Civic GX) seemed to be "fixed" with the battery disconnect, wait 10 minutes, and reconnect but now I'm worried this may only be temporary. As someone else has already questioned the low temperature concern, the temperature was around 70 degrees F here today and the vehicles was fueled two days prior and used without problem multiple times after fill up. I'll see if I can observe any temperature sensor issues with the scan tool next time this occurs but this condition happened while my wife was driving and the outside temperature remained around 70 degrees F. Has anybody determined what the logic is for this condition (low fuel blinking light then dropping fuel gauge that leads to no start). Nothing more frustrating than a problem that appears fixed but may not since you never know when it will reappear. In my case I find it hard to believe the tank valve is stuck since the battery reset cleared it immediately whereas I did not hear any attempt to operate the tank valve until reset. Also, the temperature was around 70 degrees F the entire time and it occurred while running. I had a stuck tank valve years before (was replaced) and this did not behave the same. I thought the ECM may have got into a state that required reset but until I understand the logic here, I do not know exactly why this occurred. Based on this post, it could be anything from temperature sensors, fuel filters, pressure regulator, to tank valve. My vehicle has a newer tank valve, replaced filters less than 4k miles ago, and not diagnostic codes flagged. Any further insight from folks would be very much appreciated.

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          • #35
            I do not believe this thread is being maintained well. As reported in my last post (4 weeks ago) to this thread I experienced this problem (low fuel indication where fuel quantity is rapidly dropping with no detectable leak and the car will not start - I have a 2008 Civic GX. I disconnected the battery for 10 minutes and all seemed well after reconnecting but now it is back (4 weeks later). Temperatures were in the 60s today and the car was running earlier in the day. Once again my wife was using the car and this happened at home this time. I left a small wrench in the car for her to do a battery disconnect if this happens away from home. What I'm going to attempt is to trace the tank valve signal back to the ECM control. I cannot guarantee I will not get impatient and just do the temporary battery disconnect fix again. I suspect the valve is not being opened because the ECM detects a problem. What frustrates me is that the GX supplement does not provide any details on symptoms of a bad or malfunctioning temperature or pressure sensor but does give details on how to replace. At this time I'm going to rule out the following:

            1. Tank Valve - replaced two years ago due to non-use before purchase, not behaving like it did when tank valve was sticking, temporary battery disconnect fixes (at least temporarily)
            2. Fuel Filters - replaced a couple months ago
            3. Battery - Good shape and under 1 year old
            4. Regulator - Does not appear problematic after temporary battery disconnect
            5. Fuel Relay - checked first time and did not appear problematic
            6. Fuel Door switch - I don't think I'll dignify this suggestion

            OK - I'll look for codes and indications of a problems with the scanner. The MIL light was not on.

            I suspect the ECM is latching a condition that prevents the solenoid valve from being commanded to open and needs a power cycle to clear. If this is true I'm really disappointed in Honda not setting the MIL and logging a code. If the temperature or pressure sensor is the root cause here, it can't be a hard failure since the battery disconnect cleared things and the car was in use for 4 weeks.

            I'll try to report back on what I find out.

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            • #36
              Just returned from troubleshooting the Low Fuel and Declining Fuel Quantity Indication on the 2008 Civic GX resulting in No Start. Below are my notes:

              1. Tank valve was not being commanded on - No voltage signal & no "clunk"
              2. Fuel pressure and temperature sensor signals appeared correct.
              3. No continuity or grounding issues I could find.
              4. Temporary battery disconnect cleared the fault - worked fine for several starts and let it run for 20 minutes without problem
              5. Popped fuel door open - the only thing observed is flashing fuel gauge, no issue starting or running.
              6. Temperatures were in the low 50s.
              7. No DTC either before or after temporary battery disconnect.
              8. Fuel rail pressure appeared correct for condition with no glitches noted.


              Man, this is bugging me. I suspect that one of the sensors has an occasional excursion and this upsets the ECM where the logic is detecting a fuel leak or something. Guess I'm going to need a hard failure before I can produce empirical evidence to isolate the root cause. I hate throwing parts at something and I'm pissed at Honda for designing a vehicle that does not flag anything when a start is prevented.

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              • #37
                Got a few bits more of information from my wife who was driving the car (2008 Civic GX). When the low fuel and declining quantity started she was driving (same as the first time). Instead of pulling over she headed home and drove around 8 miles. It did not stop running until she put it in park in the driveway. It was showing completely empty prior to her getting home and I doubt there was enough residual fuel in the lines to get her home if the tank valve was closed. This sure feels like logic to handle a fuel leak that may be triggered by a glitch on one of the sensors or intermittent connection on the wiring harness.

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                • #38
                  Uncle - I'm throwing parts at the vehicle (2008 Honda Civic GX) to resolve this problem. Had the forth occurrence (low fuel light with declining quantity indication and will not start until battery disconnected then reconnected) in six weeks. lcovelli provided Honda Part # 19330-RNE-A01 (Thermo Valve) as a solution earlier so I'm starting there. I did not detect a problem with the valve but it may be intermittent (glitching) and not showing a problem most of the time. I'll report back on whether it resolved my problem. Valve cost $40 at Jim White Honda with $10 shipping. Probably a few weeks until I get it - install it - then run the car for a bit to confirm the problem is resolved. Later

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                  • #39
                    OK - These are the preliminary results from replacing Honda Part # 19330-RNE-A01 (Thermo Valve) on my 2008 Civic GX. I have not had another instance of the low fuel & declining quantity indication (followed by no restart after putting in Park or shutting off) for about two weeks after replacing the Thermo Valve (Honda Part # 19330-RNE-A01). The outside temperatures have been low 30s at night to 50s/60s during the day. This valve appears to be mechanical only probably adjusting flow based on coolant temperature. It is located mid engine behind the engine and has a mounting clamp that holds it to a mounting bracket. A single coolant line enters and leaves the valve. I had to remove the air intake assembly to get my hands back there to unbolt the clamp and remove the two hose clamps. I drained about a gallon of coolant into a clean container that I reused, however I still lost some coolant when I disconnected the valve. I needed to replace about a 1/2 cup of coolant (the blue stuff) after reassembly. This is what I'm guessing is happening. This valve may not be opening or opening fully to maintain the temperature of the fuel regulator properly and the ECM detects this condition (regulator temperature low) as either an out of limit condition or low fuel pressure and locks the system from opening the tank valve (until reset/battery disconnect). I could be wrong here but that is what I believe at this time based on the information I have. I'll report back in a few months to verify whether my problem was solved for good. This job was not difficult to do and took me less than $50 total. If this is the fix for most of these occurrences reported in this thread, sounds like there are a few Honda mechanics that are throwing parts at the vehicle and not diagnosing the problem correctly.
                    Last edited by joe_kan; 12-04-2020, 08:59 PM. Reason: typo - missing info

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                    • #40
                      Looks like the condition is back on my 2008 Honda Civic GX. It has been 4 weeks since I replaced the Thermo Valve (PN: 19330-RNE-A01, In front behind engine) and I thought this took care of the problem but had an instance where I had to do the temporary battery disconnect today. Temperatures have been all over the place the past 4 weeks from 70s to 20s. Last night was in the upper 20s but the condition occurred today with temperatures in the mid 50s. Guess the next part I'm going to throw at it is 37890-RNE-A01 032 001 SENSOR ASSY. No way am I going to replace the fuel pressure regulator unless Honda pays for it - too expensive. I picked up a more capable scan tool that may give me more insight. Still sorting out software for the tool so nothing to communicate on this yet. Well ... thought I had this sorted out but it is still kicking my butt. I'll report back when I have something noteworthy.

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                      • #41
                        Thank you Joe for detailing your efforts toward diagnosing this somewhat-common problem with the Civic GX.

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                        • #42
                          Just happened on my 2011 GX last night. 🤦🏻‍♂️

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                          • #43
                            Keefover - seems to be a common thing for this vintage GX, the earlier models never exhibited this behavior. The temporary battery disconnect appears to correct it for a while but eventually returns. I replaced the Thermo Valve (PN: 19330-RNE-A01) and the rate of occurrence has gone down to once in seven weeks (only one occurrence in seven weeks for me). I'm monitoring it and have the rear temperature sensor on hand to try next. I recently got a higher end scan tool but it is not showing a problem and it can do quite a bit. I'm waiting for it to happen again and I'll put the scan tool on it prior to replacing the temperature sensor. to try and see what data the logic is using to prevent starting. I think Honda added some new logic and did not link it up with a fault code which is really frustrating to identify root cause. If you read through this thread folks are pointing at quite a few things. I've tried to correlate it to ambient temperature and have not found a link. I got a feeling there is a glitch or transient on one of the sensor signals that trips a monitor that requires reset (temporary battery disconnect). Usually a fault like this would trigger a trouble code but not this.

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