What size fuel sender for '97 Super Sport?

Jim,
I'm sure someone will be able to confirm the needed length but I'd just like to add to make sure you get the matching Ohm range.

Jim,
The 240/30 Ohm is typical so I feel you are good as long as you haven't changed the gauge to something different. What's wrong with your sender? Have you done any testing to determine it's the actual problem? Is the tank grounded?

Hi Pete -

1. Just checked continuity between fuel sender ground and Battery negative terminal and it reads 0 ohms so I think ground is ok.
2. With +lead to sender disconnected I checked ohm reading and sender reads 264ohms. I estimate 3/4 to 7/8 full tank of gas so if 330ohms is max reading with full tank that seems fairly reasonable.
4. With key in run position I checked open circuit voltage on + sender lead wire while not connected to sender and I got 9.1V. Battery voltage at battery is +12.1V.
5, Cleaned mounting lug and reattached + sender lead and voltage at sender reads +6.2V.
6. Fuel gauge is reading very slightly above empty. It does move up slightly when key is moved from off to run position however.

How is the voltage determined on the + lead to the sender - does it come from the gauge itself with a series resistor inside? Or is there some other circuit inside? I was kind of expecting +12V going to fuel sender open circuit.

I've always had a problem with the fuel gauge since I bought the boat. With a full tank the gauge would read about 3/4 tank and tank would be empty when gauge shows about 1/4 tank. (field proven testing much to the dismay of my passengers that hot summer day 4 years ago).

I took a road trip from MI to Dale Hollow Lake this summer to view the eclipse and when I arrived fuel gauge consistently read empty... that is a big lake to run out of gas on with spotty cell phone coverage... my nerves are shot.

Any ideas what I should look for?

Thanks
Jim

Jim,
What voltage do you get going to (not the sender wire) the gauge?

Here is the place who actually makes the senders,you can order them direct and get the length you need--

"For Fuel/Water senders, the length should be 1" less than the depth of the tank if tank is plastic, and 0.5" less than the depth of the tank if tank is metal. This is to account for possible tank flex"

Also thanks to Keno!

Or maybe even pull the tank and measure the inside height so you can be sure you’re ordering the right one? Tank needs to come out to install the sender anyways.

I won't be able to work on this until next weekend so stay tuned for an update.