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Gbare02tii

Fuel gauge decides when it wants to work...HELP Please

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So, my gas gauge decides when it wants to tell me how much gas I have in the tank, otherwise it is pegged up on "Full". I have replaced the sender and it does the same thing..If it is a ground, where do I check? thanks for your help in advance.

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The instrument cluster probably has a bad ground. Use the Site Search function to search the archives for "instrument ground", and you'll find many answers.

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If it is pegging on full then the wire from your sender to your gauge is grounding somewhere, or your sender is bad. When the signal wire to your gauge receives 0 ohms resistance to ground it will go to full, when it receives greater than 75 ohms it will read empty.

A bad ground to the gauge will cause it to read empty or be twitchy towards the empty position, yours reads full so that is not the issue. Next time it gets stuck on full unplug the wires from the sender, start with the short one (ground) and see if it drops to empty, if it does not then unplug the long one (signal) and then see if it drops, if it still does not then you have a problem with the signal wire (or potentially a bad gauge but they usually read empty when they die)

Also make sure the sender is plugged in correctly, it will work both ways but the correct way is the ground should go to the tack welded tab on the top and the signal wire should go the the insulated tab, if your sender is grounding itself through other means then having it backwards will cause problems.

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Guest Anonymous

Try grounding the two round knurled nuts on the rear of the instrument cluster; that's what worked for me.

Fran Ferrance

Wrightwood CA

1972 2002

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Guest Anonymous

Try grounding the two round knurled nuts on the rear of the instrument cluster; that's what worked for me.

Fran Ferrance

Wrightwood CA

1972 2002

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Our 2002 is a 1969 build. We had the same problem. In your trunk there are about four ground wires (Brown) that are screwed into the center channel between your fuel tank and spare tire well. Get the course sand paper out and sand it down to bare metal and clean all the wire contacts. Before you put them back, use some dielectric grease on the bare metal to keep them from corroding. Good luck.

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Everyone has covered the ground issue but for mine (tii) I took it apart and cleaned the wire the float rides on, It would get hung up on schmutz going up and down to determine level

I just used alcohol and a cotton swab - "very gently"

Have not taken apart a non-tii but assume similar

(edit: sorry missed the part on replaced sender - might be good to know even still)

HTH

--J

here are the 3 threads I referenced to read up

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,282582/highlight,fuel+sender/

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,278845/highlight,fuel+sender/

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,273527/highlight,fuel+sender/

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