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Discussion Starter #1
Hello,
I came home from a 50 mile trip where I filled up all was fine with the fuel gauge. came out next day and I see the fuel gauge is showing on fuel and the low gas light in blinking? so I said someone stole my gas. made it to the gas station it took 2 gals. There was some rain on the way back that night? was working when I turned it off that night.(checked how many miles) Where do I start? Fuse? connector for sender? has 52,000. funny never seen the low fuel light blink? please help.. Thanks.
 

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You might want to disconnect the battery and wait a few minutes then reconnect. Might do it.
Don't forget to write down the radio code before doing so.
 

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Discussion Starter #5
Ok. did the battery cable off for 5 mins. same thing with gauge. My OEM books had the radio code. !! next step look under the back seat and tank cover see if connector popped off??? if not pull the pump/sender unit out?? test with Ohm meter. What reading should I see?? is there a test to test the dash gauge? like a resistor? I do have a cattle crossing that is bad bump 200ft from my home. thanks for the help.
 

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That seems like an unusual enough kind of problem that I might check with the dealer... At only 52k, aren't you still under warranty? It may end up being something simple like a loose connector or stuck float in the tank, but that is something that certainly doesn't happen very often, especially at such low mileage. It's likely an electrical problem because with a full tank of gas the float is obviously in a raised position.

That said, the sending unit is located under the rear seat. You can remove the access panel and check that the plug is firmly connected. I personally wouldn't go beyond checking the wiring (removing the sending unit) unless you have mechanical experience, both for safety and also if it is a faulty part it may be harder to make a warranty claim if it has been tampered with in any fashion.
 

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Its not the regular problem you see with Honda at 52K. I was a ASE master mechanic (till 2004) master machinist gas/diesel. Alt fuels, auto/HD truck parts specialist, GM parts Consultant (test p4), teacher at Nascar training center. I got hurt and with my back can't do the auto repair anymore. can do just little stuff. can't lay on my back at all. been on SSD sometime now. have all my tools and test gear. I will check the plug. Anyone know what the ohm's should read on a near full tank testing the sender? Thank you guys! did find a page that showed spec for a civic sending unit ohm's. Showed 110 ohms E and full 2 ohms. well its a start.
 

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You can download the service manual for your CRV here. Information for testing the sending unit can be located in pages 11-335 thru 11-336 in the Fuel and Emissions section, which includes the resistance measurements. Curiously, the test refers to temporarily unplugging the Backup fuse in order to reset the fuel level reading (it will eventually reset on its own but can take 20 minutes otherwise).

I suggest downloading the entire set of the Service Manual, it's obviously very handy to have.

edit - As far as the gauge itself is concerned, it's not like the mechanical units and the display controller has an Analog to Digital converter that reads voltage levels rather than the old coil movement that ran off current, so it's probably a bit more sensitive to wiring problems.

edit 2 - Just realized that 52k miles is on an '07... that's almost 100k less than I have on my '09 ;-) The year didn't occur to me earlier when I suggested going to the dealer because the mileage was so low.
 

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Its not the regular problem you see with Honda at 52K. I was a ASE master mechanic (till 2004) master machinist gas/diesel. Alt fuels, auto/HD truck parts specialist, GM parts Consultant (test p4), teacher at Nascar training center. I got hurt and with my back can't do the auto repair anymore. can do just little stuff. can't lay on my back at all. been on SSD sometime now. have all my tools and test gear. I will check the plug. Anyone know what the ohm's should read on a near full tank testing the sender? Thank you guys! did find a page that showed spec for a civic sending unit ohm's. Showed 110 ohms E and full 2 ohms. well its a start.
2007 CRV sending unit resistance between terminals 1 and 3 (in ohms)

Full 19-21
1/2 202-212
Low 566-660
Empty 772-788
 

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The 99 Acura we had, developed an inaccurate gas gauge reading and the sender was replaced. We were told that ethanol in the gasoline was the culprit FWIW.

Never had a problem for 140K miles afterwards....
 
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