Mis-Matched Axle Ratios

[emorth]

What's the problem with the fuel gauge?
A common problem is the tank is not grounded. Make sure there is a good ground wire from the sending unit on the tank to a good chassis ground.

 

[HoundDog]

I have a Dolphin aftermarket gauge cluster in the truck. They're really nice gauges but the fuel gauge isn't working. I haven't spent much time trying to figure out what the problem is because I've been getting the engine running right and the 4wd drive working. I'm guessing that it's either a grounding issue as you suggest or the fuel sender and gauge have different ohm requirements.

I also have a newly refurbished stock gauge cluster that I plan on putting back in the truck at some point.

 

[Stumpalama]

It can be a bit of a pain fitting an after market fuel sender...

 

[emorth]

Fuel sender resistance is anything but standard. Here is an example for older, pre-computer, senders.

 

[HoundDog]

Thanks guys. I am going to attack the fuel gauge issue first and then the ebrake issue. At a minimum I know I'll need the ebrake rebuild kit and transfer seal. I'll order the parts this week and then work on the fuel gauge issue in the meantime. That one might be a freebie if it's just a grounding issue. I will start new threads for those topics if I can't figure them out on my own.

 

[76FJ40]

You may want to get a speedi sleeve to go with the transfer case seal to be safe,.

 

[Stumpalama]

You may want to get a speedi sleeve to go with the transfer case seal to be safe,.

Or have the output piece machined for the double seal.

 

[HoundDog]

It can be a bit of a pain fitting an after market fuel sender...

I got some traction on the fuel gauge issue. I called Dolphin gauges tech support and actually got to a real person who was very knowledgeable and helpful. That's rare these days.

It's what I thought, an ohm mismatch between the gauge and the sender. He told me to send him my stock Toyota sender and he'll re calibrate it and send it back to me, same day service, and for free!

Sweet!

 

[emorth]

Please take a before and after photo of the electrical parts on the sender. Very curious to see what changes they make. Did you/would you ohm out the sensor (full & empty) to see what it is now?
Thanks,
Ed

 

[HoundDog]

Please take a before and after photo of the electrical parts on the sender. Very curious to see what changes they make. Did you/would you ohm out the sensor (full & empty) to see what it is now?
Thanks,
Ed

Sure, I'll take pics and measure the ohm range before I ship it. The gauge requires a 0-90ohm range. My truck is a 1980...thought I read that it has a ~18-120 range.

 

[HoundDog]

Please take a before and after photo of the electrical parts on the sender. Very curious to see what changes they make. Did you/would you ohm out the sensor (full & empty) to see what it is now?
Thanks,
Ed

I measured the ohms on the stock Toyota sender and it was 19.6ohm Full and 118.6 ohm Empty, close to what I thought it'd be.

 

[emorth]

Thanks.
Do you know what the resistance range is for your aftermarket gauge?

 

[Stumpalama]

Thanks.
Do you know what the resistance range is for your aftermarket gauge?

I think he said 0-90

 

[emorth]

Yep. He did. I forgot.
Yet another senior moment (AKA brain fart)