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Old 05-30-2011, 10:41 AM   #1
WRXSteye20008
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Default Gas gauge stopped at a quarter tank

So I was close to empty and parked it for the night and the next day filled it up and after putting 13 gallons in it the needle moved a tiny amount to a little above a quarter tank and stopped. Thinking that was odd, I drove for 7 miles and nothing. I drove home from a party and tried to swerve and hit the brakes and gas to slosh the tank around in case the floater was stuck. When I got home 20 miles later it still has yet to move. When I turn the car on, the gauges still sweep so the needle is not stuck. I am at a loss, any help? Also Happy Memorial Day
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Old 05-30-2011, 04:48 PM   #2
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Topped the tank off and it went to above a half a tank and the needle stopped there and has not moved.
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Old 05-30-2011, 06:21 PM   #3
lickitysplitwrx
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This happened in a 2008 Carolla I owned. Took it too the dealer and the fuel pump essentially disintegrated in the tank. They had to replace it.
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Old 05-30-2011, 07:54 PM   #4
WRXSteye20008
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I have the walbro 255 that has been in there for about 25,000 miles. I would think if it was the fuel pump was it would show different results? Someone also mentioned it may be one of tell sensors or the floater.
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Old 05-30-2011, 08:00 PM   #5
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Buddies GMC truck did this and it turned out to be the sensor on the sending unit. He had to replace the entire pump since it was all built together as one.

My guess would be a sim thing witj yours since the needle still moves ok during start up diag.
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Old 05-31-2011, 07:50 AM   #6
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Everyone is leaning towards the sensor, I hope I do not have to buy the entire unite given its $235 price tag.
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Old 05-31-2011, 04:36 PM   #7
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Either the sensor or the floater. Pull out the fuel pump assembly and see which it is. If the floater has a hole in it and is full of fuel, that's the problem.
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Old 05-31-2011, 10:46 PM   #8
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I'm guessing float, my 07 did this after a "session" on a local blacktop.
I was running about a quarter tank and there it stuck, after a couple fill ups it seemed to straighten itself out, I'm wondering if there was some trash in there somewhere.



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Old 05-31-2011, 11:49 PM   #9
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Can this be a part of the famous "My fuel gauge never shows full" problem? I read lots of posts about ppl having prob with their fuel gauge and as do i. I don't get whats the prob.

Number one my gauge never shows full. Maybe the extra fuel in the tank pushes the floater down so the sensor reads it as it is lower.

Number two If i drive long distances the gauge will go down slower then it should be, like a delay or incorrect reading. Like my tank will show half a tank but the next time i start the car the gauge shows lower then it was before the shut off.

Any idea?
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Old 06-01-2011, 01:59 AM   #10
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my fuel gauge was acting funny for awhile, and I ended up putting a strong fuel system cleaner hoping to clean up whatever gunk was causing the funky business.

after a bottle of bg44k it went back to normal. redline fuel sys cleaner works good too and is cheaper and can be found locally.

I think if you leave your gas tank emptey alot or never fill it up full causes these problems.
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Old 06-01-2011, 04:15 AM   #11
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The thing is the fuel pump and assembly with the sensor and the floater have been removed twice, very clean and no gunk. Once by me and once my a shop, and after the shop it went back to normal for a little but after a week or 2 it started the same thing.
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Old 06-01-2011, 11:45 AM   #12
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Quote:
Originally Posted by the suicidal eggroll View Post
Either the sensor or the floater. Pull out the fuel pump assembly and see which it is. If the floater has a hole in it and is full of fuel, that's the problem.
That is what a friend said and to check the metal rod as well. I have been referencing these two threads as guidance to figure this out:

http://www.iwsti.com/forums/2-5-lite...ing-units.html


http://www.iwsti.com/forums/how-inst...placement.html

I called to make sure they had the sensors and the main is $69.50 and the Sub is $61.50 which is less likely than the main.

BlackFighter I do not believe this is the same issue.

fastwrx25 i rarely ever leave it below a quarter tank :/ I called IAG Performance yesterday and they said it sounds like the sensor or the floater. Next week when I am back in town I will pull the assembly and check the OHM's on each sensor and see if they are in check on where they should be, which with what I read is 2.5.

UPDATE: When I topped the tank off 2 days ago it went up to a little below 3/4 tank and within a day it slowly returned back to the quarter tank position with only 96 miles on the car (I drive a lot for work).
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Old 06-02-2011, 10:42 AM   #13
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Pulling the assembly after returning from STPR to see, it is sounding like the float. Now realistically at a quarter tank and when below where it is stuck at, the gauge actually drops. I am curious to see if the low gas light would come on, if that came out having a bad sensor, would it even come on at all?
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Old 06-03-2011, 01:19 AM   #14
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This happened to me once. Check your grounds that attach to the intake mani. I know i forgot to bolt one down and this happened. Just check that before you start buying stuff
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Old 06-15-2011, 08:29 AM   #15
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UPDATE: On 6-10-11 I was able to pull the fuel assembly out and inspect it and also change out my fuel filter. I checked the OHM's of sensor and around 1.5ohm it would overload. So I ordered a new sensor today which was $69.50 for the main. I will get the part # and put it here then in case someone searches this in the future.
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Old 06-15-2011, 12:22 PM   #16
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Happened to my 06wrx

I decided to pull the assembly and replace the fuel pump and everything was fine.
I wonder if the floater got stuck, and when replacing my fp, it got free'd?
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Old 02-09-2013, 02:41 AM   #17
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wondering about this too.. I replaced both original main & sub sensors which have 246K on them..

anyways when I did that the gauge went to 3/4 and pretty much stayed in that area.. I have a feeling it might be a stuck float on the main sensor side as it was a little awkward getting the new sender in vs the old and did not want to sit right on the mounting studs.

I knew something was funny because what started at 1/2 it kept going up and up about a hour into driving to 3/4 and being as I was 60 miles in I was like this can't be right and I went to get fuel and put in 10 gal worth for a full tank.

As soon as it's light out I will check.
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Old 02-13-2013, 08:42 PM   #18
WRXSteye20008
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Quote:
Originally Posted by SubaruImpreza_power
wondering about this too.. I replaced both original main & sub sensors which have 246K on them..

anyways when I did that the gauge went to 3/4 and pretty much stayed in that area.. I have a feeling it might be a stuck float on the main sensor side as it was a little awkward getting the new sender in vs the old and did not want to sit right on the mounting studs.

I knew something was funny because what started at 1/2 it kept going up and up about a hour into driving to 3/4 and being as I was 60 miles in I was like this can't be right and I went to get fuel and put in 10 gal worth for a full tank.

As soon as it's light out I will check.
I knew this thread look familiar from 2 years ago lol I pulled the fuel assembly out and saw a "dead spot" where the float would measure how was in the tank. I gave it a little nudge and it fixed itself with replacing the sensor and fuel filter. Let me know if you figure your issue out.
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