DEFUNCT MOTOR
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  1. #1
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
    any tector i can get my hands on
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    DEFUNCT MOTOR

    i know this has nuthing to do with metal detecting. but so what right ? its still tech talk. and its puzzling so i need to know. the motor quit. so what id like to know is ? can i check the resistance of the two terminals to possibly determine what went wrong internally ? brushes wore out ? which is the most likely ? so if the brushes wore down to nuthing i should get 0 resistance ? is that right ? or it seized ? also just want to say this is a fuel pump motor about 7 inches long and if itClick image for larger version. 

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ID:	1800580Click image for larger version. 

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ID:	1800581 lasted almost 27 years in my old van then it was a good run huh
    trdking likes this.

  2. #2
    Charter Member
    us
    David

    Mar 2013
    North Eastern NC
    Equinox 800 and Excalibur
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    0 ohms resistance is a dead short. An open circuit will show infinite ohms or at least an extremely high number of ohms.
    RustyGold and trdking like this.

  3. #3
    Charter Member
    us
    Nov 2012
    Maryland
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    Bottom line is - try to find a new one. No one fixes these anymore that I know of. Kudos on getting it out!
    trdking, nomad 11 and RaeShine like this.

  4. #4
    Charter Member
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    Tommy

    Dec 2015
    Ann Arbor
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    If the pump is in your tank its easier to cut an access panel then to drop the whole tank not sure how yours is set up just 2 cents
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    Still Available Approved TreasureNet Sticker $2.00 for 11" X 3" Bumper Sticker ::. I have 34 left PM me if you would like to buy any Tommy.................... Put it on my Trans Am FREE SHIPPING Street Racing My Trans Am W/Tnet Stick

  5. #5
    Charter Member
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    Nov 2018
    Michigan
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    Its a DC motor inside, if you can get it apart you might be able to get a new motor...
    trdking likes this.
    I'll sleep when I'm dead

  6. #6

    Aug 2016
    MI
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    Quote Originally Posted by djackson7348 View Post
    0 ohms resistance is a dead short. An open circuit will show infinite ohms or at least an extremely high number of ohms.
    Like djackson stated, if your getting 0 ohms, the motor is shorted and would have blown the fuse in the circuit. If your reading an open with the ohmmeter, the motor is shot. I'm assuming you confirmed that the fuel pump relay is working properly and proving 12 volts to the fuel pump motor when the car is started.

    Here's a wiring diagram for a fuel pump...

    Click image for larger version. 

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    RustyGold and nomad 11 like this.

  7. #7
    us
    Jun 2006
    Out in the hills near wherendaheckarwe
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    Take it down to pick a part with a 12v motorcycle battery to test. Cheaper easier & more fun. Used to buy fuel pumps for VWs for $3. A pair of needlenose pliers, a new O ring & a piece of thread topped off with a spritz of paint. They sold like hotcakes at the VW clubs.
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    I know it's here, just need a bigger coil!

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  8. #8
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
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    Quote Originally Posted by smokeythecat View Post
    Bottom line is - try to find a new one. No one fixes these anymore that I know of. Kudos on getting it out!
    its all ready done. i just want to know why it failed. the only way to open it up would be tear the metal casing. which would mean not being able to reuse it. theres no way to rebuild the motor itself and reuse it. it was definitely a nail biter getting it out and back together. still trying to recuperate 2 months later. cant wait for warmer weather to have a couple brews and catch a quicky buzz.
    RaeShine likes this.

  9. #9
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
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    so before i tear it apart ? the wider prong would be what the positive post right ? and if i check it with a multimeter if the brushes are worn all the way down that would mean a short then correct ? and i should get what reading ? now if the brushes did not wear all the way down ? which i think is improbable because as i said its almost 27 years old. and the way the lock ring was rusted in it has to be the original from the factory. just to let u know this is a Walbro pump. so if anybody was ever on the assembly line that assembled these ? thanks. and rest in peace Lee Iacocca a job well done

  10. #10
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
    any tector i can get my hands on
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    Quote Originally Posted by A2coins View Post
    If the pump is in your tank its easier to cut an access panel then to drop the whole tank not sure how yours is set up just 2 cents
    well if anybody offers me their 2 cents i prefer indian heads
    A2coins likes this.

  11. #11
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
    any tector i can get my hands on
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    Quote Originally Posted by SD51 View Post
    Like djackson stated, if your getting 0 ohms, the motor is shorted and would have blown the fuse in the circuit. If your reading an open with the ohmmeter, the motor is shot. I'm assuming you confirmed that the fuel pump relay is working properly and proving 12 volts to the fuel pump motor when the car is started.

    Here's a wiring diagram for a fuel pump...

    Click image for larger version. 

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    yeah i'm long past all this. thank God. thanks though

  12. #12
    us
    Mar 2014
    Traveling US to work
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    Several things come to mind, one is that the brushes are worn out~ this would mean no electrical contact between the brush and the armature and an open circuit or the contacts of the armature are worn causing the same condition. Excessive carbon and or arcing deposits on those areas can do the same thing but on a multimeter they may show continuity or high resistance but the contacts wont be good for power transmission. Then it could be that the windings of the armature have opened, again no continuity so an open circuit. There could be and internal short either to the brush, armature or windings and my last thought would be that the internal bearings for the armature are shot creating enough resistance that the motor can not turn properly or at all.
    Lots of things can make a motor go bad. Electrical testing and tear down and inspection are the only way to know what happened. Rebuilding those type's of motors is likely to be more of a problem then just replacing it but if you want to take the time and try have fun.
    Last edited by DDancer; Feb 13, 2020 at 08:48 AM.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

  13. #13
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
    any tector i can get my hands on
    2,403
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    ok. I finally mustered up the will or ambition to get my multi meter out and check for resistance of my little kaput motor. I asked if the large prong earlier if the large prong was the positive side and nobody told me. now I looked and it wasn't marked either. so I just had to presume it was. not red or black either. so I got a reading of about 250 ohms. so I guess this means the brushes aren't completely worn down that that would be shorting out. would that be correct ? so ?

  14. #14
    Charter Member
    us
    "WP"

    May 2012
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    Not saying it's right....We theorized that "flat" spots in a winding could stop a fuel pump.
    The sporadic ,couple times after initial fail they would run was part of why we thought that.
    They are good. Or bad.
    One might run when power is applied after removal from tank , but that does not mean it is "good".

  15. #15
    us
    nomad roman numeral 2

    Nov 2009
    nomads land
    any tector i can get my hands on
    2,403
    2427 times
    Quote Originally Posted by releventchair View Post
    Not saying it's right....We theorized that "flat" spots in a winding could stop a fuel pump.
    The sporadic ,couple times after initial fail they would run was part of why we thought that.
    They are good. Or bad.
    One might run when power is applied after removal from tank , but that does not mean it is "good".
    no i tried that. presuming the wide terminal was positive ? must be a big secret ? i hooked it to my car battery with jumper wires. maybe that would be exposing to much current directly ? but it wouldnt even attempt to spin or even growl ? if i was to say ? hook it to a 9 volt battery and the motor was in good shape would that be enough to turn it over ? or would it still be lacking the amps ?

 

 
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