The Stovebolt Site Forums The Shop Area General Truck Talk Fuel tank sender calibration

OK, this graphic might be a bit of “over-kill”, but I’m in Houston
(inside) trying to deal with this virus crap and the temp outside is 100 degrees…

Anyway, my question is how would you calibrate/adjust
or bend the arm (which direction?)

From my drawing, if you bend it down, I agree that “EMPTY”
would read more accurate, also I wouldn’t be too concerned about “FULL”
as it would have to burn a bit more fuel before coming off of “FULL”, I’d be OK with that.

My concern is anything in between is not going to display accurately.
In my drawing, you can see my (current) fuel level and what is indicated when I turn on the key.
I realize this system is “old school” but I’d just like to have a fairly accurate indication
throughout the range.
Please help, how would you correct this? Thanks, Jim

We build lots of street rods so deal with this with the install of aftermarket senders. What seems to work as good as any is to fill tank HALF full and adjust sender float arm so gauge reads 1/2 full. This gives a near equal error for both full and empty and so far hasn't led to rides sitting on the shoulder out of gas. A good idea is to zero the odometer and carry a gas can so one can get a firm idea as to when things get quiet. If you do it more than once then the one behind the steering wheel needs adjusted.

I don't look at where the needle is exactly when it gets below the half way mark on the gauge. I look for when the needle quits wiggling from the sloshing gas. Once the needle stops moving, I know that I have about 30 miles of gas left, give or take and annoyed friend or two.

I did it the way coilover suggests, start with an empty tank, fill with 1/2 of the rated capacity and adjust the sender to read half gauge.

I have mine reading empty when there is three or so gallons left in the tank. I ran out once and want to make sure I don't do it again, thus the 3 gallon safety factor.