Anyone know how to the test fuel level sensor?
My fuel gauge is broken now and just sits at empty. I want to test the sensor. Anybody have any information on this? A page in the shop manual or a webpage? TIA.
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I have the shop manual. When I get home, I'll let you know how to test it.
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anyone ever figure this out? my low fuel light came on last night, I stopped and got gas, the light turned off, but the gauge is still on empty :mad:
any ideas for what i should check first? TIA |
Originally posted by ISUposs anyone ever figure this out? my low fuel light came on last night, I stopped and got gas, the light turned off, but the gauge is still on empty :mad: any ideas for what i should check first? TIA $62.70 from Malloy Mazda shipped to your door. List $112.34. |
Originally posted by ISUposs anyone ever figure this out? my low fuel light came on last night, I stopped and got gas, the light turned off, but the gauge is still on empty :mad: any ideas for what i should check first? TIA |
Originally posted by alwan16 the low fuel light has a different sensor than the actual gauge. to test the needle sensor you just use an ohmeter after you have pulled out the sensor that is mounted with the fuel pump. the low fuel light sensor can be tested similarly. hook up and ohmeter and dip in and out of gasoline/other liquid. There is no question you are correct in your analysis, but chasing down individual components can drive anyone crazy - like me!:eek: ;) |
Stop do not remove the tank to get to the unit. Pull up the carpet and remove the unit from the top of the tank. the repair may be as easy as bending the scraper to the resister coil.
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cool, thanks guys. I want to troubleshoot this problem and not just start replacing parts (i've said it before and i'll say it again, i'm a broke college student with nothing but time :)...evidentally not enough time for a job :confused: ). what resistance should the rheostat read ( I'm assuming it works off of a rheostat concept).
as far as I know, it could be something in my dash giving me shit, so i want to find out what it is for sure. anyway, thanks again guys. |
Originally posted by duboisr Stop do not remove the tank to get to the unit. Pull up the carpet and remove the unit from the top of the tank. the repair may be as easy as bending the scraper to the resister coil. Boy howdy - do I understand trying to save money and fix it without new parts. Unfortunately I don't think it can be done in this case - but I sure admire him for giving it the old college try!:D I'll look up the resistance later today. |
so I go out for a little drive today and it's worked it's way up to 3/4 tank (when it's actually full), so it is all screwy. i'll pull it out of the tank next weekend and see if I can figure out what is happening in there.
thanks guys |
Originally posted by ISUposs so I go out for a little drive today and it's worked it's way up to 3/4 tank (when it's actually full), so it is all screwy. i'll pull it out of the tank next weekend and see if I can figure out what is happening in there. thanks guys Sorry.:( But....if you insist - the testing procedure is in the Electrical Shop Manual and by clicking the Mazdaformance ad at the top of the page you should be able to download a copy - I think.;) |
it is possible that your resistor part of the sensor is okay and maybe just the float came loose and is sitting in some funky position. mine came off completely. all i had to do was clip it back to the metal rod it was supposed to be attached to. that and replace the entire tank because the baffling had come loose :(
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shit? i'm having my tank replaced this week too because of the baffles...?! and they knocked the floater off the level.
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Ok, my gauge is reading at 1/4 level, eventhough I topped off the tank. WTF? What do I replace here? The tank? The floater? The fuel pick-up? I'm confused!?
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mine just kind of started working again and I haven't had a problem since. I figure i'll take a closer look when I install a new fuel pump.
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How many tank-fulls before your gauge started to work again? Ahh, the FD Rx7...it's always sumpthin...
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I have a theory about why mine stopped working. It was about 80F here for a couple of days, then it went down to 20-30F OVERNIGHT!! my guess is that water condensed somewhere that it interfered with the the level sensor. once it got warm again, it worked. Kinda strange.
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Mine mysteriously fixed itself today. The needle just jumped back to the level I think it should be 3/4 full (after 1 and a half days of driving off of full tank). W I E R D, huh?!
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good to hear :)
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If you want to determine if your gauge is working, ground out the wire that goes to the fuel tank sensor. Your gauge should read full.
Open the circut and you should read empty... Typically, the connection becomes corroded and you either get a false reading or no reading.... The tank sensor can go bad if there's been water in the tank... in which case it should be replaced |
update:
My gauge started acting weird again so I pulled the pump/level assembly out of the tank. I cleaned the rheostat area with some fine emery cloth.....VOILA!! (sp?) It works correctly again. It just had a back varnish built up on it. So for anyone with an irregular gauge, try cleaning it before spending $60+ dollars on it like someone suggested. :stickpoke :D |
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