Ohms for 73 Series Fuel Float Sender- Anyone know factory spec? (2 Viewers)

[BTUMAN]

I'm looking to use an aftermarket display\pump switch for an aux tank and need to know the Ohms. The tank is mounted with no access but I know it has a factory 73 Series sending unit.

This will save me from dismounting an aux tank. Thanks in advance. I suppose in maintenance manuals, but could not find one online.

 

[cruiserdan]

What I find shows full to be 3 ohms, 1/2 to be 32.5 ohms and empty to be 110 ohms.

 

[BTUMAN]

Thanks Cruiser Dan- so would the factory 75 series sender have the same ohms by chance? As it turns out the one one on the tank from a 73 is dead and was put on to just plug the hole. - So I can order any sender so long as close to correct length.

 

[cruiserdan]

The manual I have simply says 70 Series. It does not breakout variants so presumably the resistance values are the same. This is a service manual, not a parts catalog, so I do not have a method to determine physical fitment. In other words they tell the same electrical story but may still be vehicle-specific due to tank shape and mounting location.

 

[joekatana]

Those tanks where intended to replace the 90 liter hzj76 tank so that sender would be the right one but those are 12volt, maybe try a sender from a hzj77

Joe

 

[BTUMAN]

Ok. Thanks Joe. Per online search- Hzj7x - this looks like the one to get.

HZJ70,73,77,KZJ7#,PZJ7# 05.1993 - 08.1999

 

[drujba]

Cannot answer the "how many ohms does the original fuel sender" question, but here's a gauge that is programable for any fuel level sensor with an output between 0 and 270 ohms.
And it's not necessary to know before the ohm values of your fuel sender.

 

[BTUMAN]

Interesting. Now I need for 24v.

 

[cruiserdan]

The sender is a variable resistor. I doesn't care if it is 12 or 24v.

 

[BTUMAN]

Yes- but the resistance is dependent on voltage - the gauge in dash as well. Ohms Law. R= Current/Voltage

 

[cruiserdan]

Then it is a mystery to me why the 24 volt and 12 volt BJ74s use the same part numbered tank sender. The JDM 12v FJ62s and 24v HJ60s use a common sender as well.

 

[BTUMAN]

Maybe matched with a different part number gauge? Ohms delivered should be different to the gauge is 12v vs 24v.

I mean- maybe there is something I’m missing. You guys are the experts on parts for sure. Just have not dig deep into this.

 

[cruiserdan]

The gauges are indeed different part numbers. My take is the sender is the same for either voltage and the gauge is calibrated differently.