[Testing a gas tank sending unit on a 65 Beaumont

65sssd · Poncho Master!

[Testing a gas tank sending unit on a 65 Beaumont

67Poncho · Uber Guru

Key on with the brown wire off of the sending and the guage should go overfull. If you ground the brown wire, she should read empty. In electrical terms, 0 ohms will be empty and @90 will equal full.

Fuel Gauge

The fuel gauge is an electrical instrument that measures an electrical current from a variable resistor in the fuel tank. A float controls the variable resistance.

When the fuel tank is full, the resistance is high. Then, the fuel gauge moves to the maximum position (Full) on the gauge face.

When the fuel tank is empty, the resistance is low. Then, the fuel gauge moves to the minimum position (Empty) on the gauge face.

65sssd · Poncho Master!

Thankyou for the info. I'm a contruction electricial but not a Auto electrician. That makes sense.

67Poncho · Uber Guru

65sssd wrote:

Thankyou for the info. I'm a contruction electricial but not a Auto electrician. That makes sense.

That's funny as I am the opposite!!! I know next to nil about house electricial and 220 baffles me!!! But give me a schematic for a vehicle.............................!!!

65sssd · Poncho Master!

They are different for sure. I am a commercial electrician but I do the res stuff too. Those car schematics are messed up to me.

4SPEED427 · A Poncho Legend!

Auto electrical and house electrical sure are opposites. I can't get used to a black wire not being a ground wire...

seventy2plus2 · Canadian Poncho Superstar!

I can do both. Among other things, when I put the big block in the convertible I made a whole new engine harness. This winter I wired my basement (and yes it passed inspection). I've been a telecom tech/engineer for coming up on 30 years.