Who knows the ohm values of the "early" 83310-60011 (up to '72) fuel sender?

[bj40green]

Hi all,

For my thread Clusters, Gauges and Odo meters I need to know the ohm values for the early (up to 1972) fuel sender #83310-60011.


Empty:.............ohm
½ Full:..............ohm
Full:.................ohm

Who can help me out?

Thanks in advance,

Rudi

 

[Downey]

Ohms values

3/69 to 9/72 is 110 ohms empty by 3 ohms full, but with a 7 volt drop. Guys who use my fuel cell with electronic sender can use a 170/33 ohms sender and then don't have to worry about the 7 volt drop.

 

[bj40green]

Hi Downey,

Thanks for the info. So the OEM sender is 110 ohms empty and 3 ohms full, right?
Can you explain the 7V drop?
I know that the later clusters ('73 and later) have a Voltage Regulator build in in the Fuel gauge which makes 7V for the Fuel and Temp gauges and senders.
Goes the same for the pre '73 clusters?

Thanks,

Rudi

 

[Downey]

7 Volt Drop

Toyota Japan actually gave me all the gas tank sender specs many moons ago, they said the 9/72-older had a 7 volt drop built-in, but that the 9/72-newer did not??? Perhaps Toyota built the 7 volt drop into the sender on the older models and built it into the gauge on newer models- - - I don't know. What I do know is it is easier for the 9/72-older vehicles to use the 177/33 electronic sender when using a stock tank and auxiliary tank with the older dash gauge because of the 7 volt drop (i.e. 177/33 without 7 volt drop evidently equals 110/3 with 7 volt drop according to Centroid).

 

[bj40green]

Okay! Now we're getting somewhere.
Next questions:
Can you measure the ohms with an ohm meter?
Is that "voltage dropper" a resistor or is it the same circuit as in the OIL pressure sender?
See this pic of the OIL pressure sender which never changed over the years.
The same model from 1962 till 1986.


Thanks!

Rudi

 

[Downey]

Inspection/test

I can't help with that Rudi, I no longer have any parts to inspect.

 

[bj40green]

I can't help with that Rudi, I no longer have any parts to inspect.

OK Downey, no problem. Thanks for the help so far.
Hopefully somebody else can help to figure this out.

Rudi

 

[71-CRUISER]

With the early gauges and senders you get battery voltage to the input of the fuel gauge. the output side of the gauge will also have battery voltage and it will continue to the input of the sender (@12v). The "Resistance to Ground" will vary with fuel level (with the above figures).

With the later gauges and senders you get battery voltage into the gauge however the output is resisted down to 5-8 volts which then runs to the sender.

The issue is that if you run a full 12 voltes into a late sending unit (if you use a early non resisted gauge) you will melt the sender in the tank.

You can however still get both the new and old senders new from Toyota (1800-870-0038 Lowe Toyota)

 

[bj40green]

With the early gauges and senders you get battery voltage to the input of the fuel gauge. the output side of the gauge will also have battery voltage and it will continue to the input of the sender (@12v). The "Resistance to Ground" will vary with fuel level (with the above figures).

With the later gauges and senders you get battery voltage into the gauge however the output is resisted down to 5-8 volts which then runs to the sender.

The issue is that if you run a full 12 voltes into a late sending unit (if you use a early non resisted gauge) you will melt the sender in the tank.

You can however still get both the new and old senders new from Toyota (1800-870-0038 Lowe Toyota)

Thanks for the explanation. I'm familiar with the later gauges and senders.
I'm trying to help out a Mud member with a brand new sender that doesn't work correctly so the question is: Can he measure the sender resistance to check the Empty, Half and Full values or not.

My thread: Cluster, Gauges ans Odo meters

The buddy I try to help: 70-fj40-fuel-gauge-mis-reading

Maybe you can shine a light on this problem?

Thanks,

Rudi