fuel sending unit question

ConcreteAce · Posted: Sun Sep 14, 2014 7:35 pm Post subject: fuel sending unit question

I figured I would have a better chance of finding someone who has dealt with these sending units before even though it came out of my 61 fuel tank. I have seen these advertised before but I know very little about it.

Here is the sending unit

Image may have been reduced in size. Click image to view fullscreen.

Looks to be a wire use to be attached to here I am not sure if this is something I can fix or not.

Here are a few questions I have.

1. Is there a way to test this unit?
2. I am pretty sure a wire was attached to the end, is there a way to repair this?
3. are these six volt only?

I tried the search feature but my combination of words did not amount to anything. Thanks
_________________
Ethan Dunlap
Spring, Texas

'51 Deluxe
'61 Build
'68 Turbo Diesel Baja
'64 Ghia Vert
'61 Baja Build

57BLITZ · Posted: Sun Sep 14, 2014 9:00 pm Post subject:

To test . . . use an OHM meter to measure the resistance . . . between the sender wire and where the unit grounds to the tank . . . the resistance should have a lineal/continuous change as you move the float arm.

6 volt or 12 volt . . . the sender does not care . . . it only changes the resistance in the wire . . . your fuel level gauge measures the resistance and displays the information as "full" or "empty" or in between.

As for repairing the broken wire . . . do the test first. If the rheostat in the unit is bad, don't waste your time trying to replace the wire!
_________________
Jesucristo es mi Señor y Salvador!

ConcreteAce · Posted: Sun Sep 14, 2014 9:19 pm Post subject:

Thanks, I will have to try that. Unfortunately I meant to grab it before I left the shop today, It will be next week before I can grab it. That and I will need to borrow a meter from a buddy Very Happy

_________________
Ethan Dunlap
Spring, Texas

'51 Deluxe
'61 Build
'68 Turbo Diesel Baja
'64 Ghia Vert
'61 Baja Build

57BLITZ · Posted: Mon Sep 15, 2014 3:53 pm Post subject:

Something to keep in mind . . . The range of ohms of the sender needs to match that of the fuel gauge . . .

BTW, your project looks AWESOME!!!! Very nice work!!!
_________________
Jesucristo es mi Señor y Salvador!

ConcreteAce · Posted: Tue Sep 16, 2014 7:39 pm Post subject:

ConcreteAce · Posted: Sun Oct 05, 2014 4:48 pm Post subject:

Well its been a couple of weeks, I kept forgetting to bring the sending unit home. So I touched the red probe from the meter to the little section of wire that was left and my black probe to the part that bolts on to the tank, I set my meter to the lowest setting 200 and moved the float back and forth. I got nothing. Just to make sure I went through all the other setting and still I got no reading at all. So it seems that the sending unit is bad. My next question is can these units be rebuilt ?
_________________
Ethan Dunlap
Spring, Texas

'51 Deluxe
'61 Build
'68 Turbo Diesel Baja
'64 Ghia Vert
'61 Baja Build

ConcreteAce · Posted: Sun Oct 05, 2014 6:33 pm Post subject:

I did find some thing interesting I knocked off the brown crud with my wire wheel and stamped into it is these numbers
VDO 31 2
and below that is
10 60

I am guessing the second set of numbers is the month and year.
_________________
Ethan Dunlap
Spring, Texas

'51 Deluxe
'61 Build
'68 Turbo Diesel Baja
'64 Ghia Vert
'61 Baja Build


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