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fuel gauge sender potentiometer, specs by hdryder
Started on: 04-19-2015 09:06 AM
Replies: 7 (259 views)
Last post by: hdryder on 04-25-2015 05:14 PM
hdryder
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Report this Post04-19-2015 09:06 AM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Does anyone have the Fiero fuel gauge sender potentiometer specifications for the correct signal?

It looks like a previous owner has replaced the potentiometer with a non-stock unit.

Thank you for the help on this one.
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Gall757
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Report this Post04-19-2015 09:26 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Empty is 0 ohms. Full is 90 ohms.....in theory. Very few stock senders show 0 ohms any more.
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hdryder
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Report this Post04-19-2015 09:35 AM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Ever since I got it running, the gauge on my '88 GT was stuck quite a bit above the Full mark. I did some trouble shooting, including swapping in other spare gauges which gave the same result. I finally determined the problem was most likely the sending unit in the tank.
I dropped the tank yesterday to check it out.
The readings I am getting are 43 ohms empty, and 198 full.
So then I plugged the module 3 wire harness back into the chassis wire harness while the module assembly was still out of the tank and the float at the Empty position.
I turned on the ignition key, and for the first time the gauge needle move down to about have Half Full location. When I move the float to the Full position, is raised way above the Full mark once again.
It would be the easiest if I could get this aftermarket sending unit to work rather than replacing it, but I don't see any adjustment on it.

[This message has been edited by hdryder (edited 04-19-2015).]

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Gall757
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Report this Post04-19-2015 04:44 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Too much corrosion on the parts equals too much resistance. If you clean the metal parts up and it still reads high, you may need to find a new sender.
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darbysan
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Report this Post04-20-2015 10:30 AM Click Here to See the Profile for darbysanClick Here to Email darbysanSend a Private Message to darbysanEdit/Delete MessageReply w/QuoteDirect Link to This Post

They can be fixed, either by replacing the potentiometer, or by sending out for repair. I repaired mine by replacing it with a Pot from an old spare sending unit.

Pots and repair can be obtained here:

http://tristarrradiator.com...Products%20Page.html

I thought the price for the Pot, or the repair, was high, but if someone has a rare sending unit then it may be an only option.
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sardonyx247
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Report this Post04-20-2015 05:34 PM Click Here to See the Profile for sardonyx247Click Here to visit sardonyx247's HomePageClick Here to Email sardonyx247Send a Private Message to sardonyx247Edit/Delete MessageReply w/QuoteDirect Link to This Post
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hdryder
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Report this Post04-20-2015 07:55 PM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thank you for the help.

I ordered one of these from Summit.


http://www.summitracing.com/parts/CIN-SN38

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hdryder
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Report this Post04-25-2015 05:14 PM Click Here to See the Profile for hdryderClick Here to Email hdryderSend a Private Message to hdryderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hi sardonyx247,
Today I am working on the mods, like you did, on the Classic Instruments SN38A Tank Sender that I bought from Summit.
Everything is going well.
Thanks,
Luke

[This message has been edited by hdryder (edited 04-26-2015).]

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