Ohms for testing Aux 12 gal Sending unit

[RedLeg0811]

I am wondering if anyone know what the ohm readings are supposed to be so I can test the sending unit with an ohm meter?

Yes I know I can plug it in, but I am not ready to do that with the other work I am doing and I need to get the Aux tank in before I can complete that work. Chicken or egg, right.

Thanks
Martin

 

[70_Steve]

~73 ohms empty, ~10 ohms full.

 

[Viperwolf1]

~73 ohms empty, ~10 ohms full.

And about 23 ohms at 1/2 scale.

 

[MarsChariot]

I don't think that I have done this on an aux sned yet, but here are results for the main sender. The idea was a comparison of the typical aftermarket sender with the OEM sender. But results for the aux should be similar to the main over its range of travel.

 

[RedLeg0811]

I get 82 ohms empty and 11.5 ohms full. I think there is a 10ohms +- variance allowed. Maybe 30 ohms at approx. 1/2

Also have a chip in the float I want your opinion on. Will post picture Thursday

 

[RedLeg0811]

Found out I need to either replace the float or repair it. If I don't the foam will soak up water and fuel. I can't find a replacement unless replacing the whole sending unit, so maybe a bit of JB weld.

 

[DirtDonk]

I had to "tweak" my factory original sending units AND my dealer sourced brand new ones back in the late seventies.
I bent the arms in such a way as to catch the stop bars earlier or later, and even bent the bars a little bit too if I remember.

Mine never read full in it's life, and always empty was WAY below empty. I always ran my tanks dry back then (before I knew I was stressing the fuel pump) so knew just how much I had and how much I needed.

When I was through with my bending things, the gauge read perfectly for me. Just a needle's width or two above the line when full, then just the same amount below the Empty line when I ran out.

All in the adjustments to match my own gauge and electrical system characteristications.;D

So if you get a new one that doesn't quite match up the way you want, don't hesitate to make a few modifications yourself before installing it.
The extra time now is so well worth it.

Paul

 

[70_Steve]

I can't find a replacement unless replacing the whole sending unit, ...

They are available. Found this one in less than a minute on JBG site.

http://shop.broncograveyard.com/197...k-Brass-Sending-Unit-Float/productinfo/20238/

 

[RedLeg0811]

Thanks Steve, but wrong type. I found those type all over. The type I have I found, but only on a whole sending unit.



Paul,
I know about the bending to tune it. I was just trying to do some preemptive work before mounting the tank.
Thanks
Martin

 

[DirtDonk]

Aftermarket tank then it looks like. Definitely a more finicky setup, at least in the main rear tanks. Not sure about the front tanks.
What brand tank are you installing?

Paul

 

[RedLeg0811]

Yeah it is the NWMP tank. I have the main tank from them and I got lucky as it reads well on my gauge.