Catalina 320 Forum

There is a great article on Catalina Direct

https://www.catalinadirect.com/images/features/Engine%20Instrument%20technical%20information%20small.pdf?CFID=11371816&CFTOKEN=c62de31af7567fe8-7D6CD8B9-93E2-5F5A-0C33CC2D2A9D8F81

Essentially, the gage is a voltmeter, and the sending unit is a rheostat. As the arm swing the resistance runs between 35 ohms when full and 240 ohms empty. You can read that with a multimeter from the pink wire on the gage to ground.

If always 'full' it means the sender in likely shorted to ground. Make sure the connector on either end are not touching anything but their respective terminals.

Mine was shorted and always ready "Full". I replaced it with Seachioce Fuel Sender  model 15461

Good luck

Pat Tormey
Catalina 320 #1037
Blue Skies s/v
Newport, RI USA

-----Original Message-----
From: C320-list <c320-list-bounces@lists.catalina320.com> On Behalf Of David Birken
Sent: Wednesday, August 10, 2022 9:17 PM
To: c320-list@lists.catalina320.com
Subject: [C320-list] Fuel sender puzzler...

The fuel tank on my C320 is not quite a cube but instead much deeper along the forward section than aft. The fuel level sender is positioned in the deeper part of the tank forward. I have just returned from a ~14 hour motor and filled up just before leaving. The gauge still reads full after returning and I ran pretty hard (3000 rpm) so I assume consumption was at least 1/2 gal per hour or more.

The sender was just replaced 2 years ago. Any ideas on how to calibrate this? Do I need to replace sender? How do I compensate for a trapazoid shaped tank? Anyone with experience on this?? I appreciate all thoughts.