Editing Z31/fuelsendermod (section)

=== Overview ===

The OEM fuel sender works via a cylinder float design that rides on a rail with a copper line for contact. It provides two readings, one for the main gauge and one for the sub gauge. The rail provides a resistance range that differs based on the Meter type.

For Analog systems on the main gauge, your range will be approximately 6Ohms Full, approximately 80Ohms Empty, and ½ tank approximately 30-35Ohms.

For Digital systems on the main gauge, your range will be approximately 10-20ohms Full, approximately 480-520ohms Empty, and ½ tank approximately 100-110Ohms.

While compact in design, they suffer from corrosion and as a result the contacts on the float cannot make good contact on the slider of the sender which causes incorrect readings on the gauge. You can try cleaning the contacts and may find success. Another issue is the thin copper contacts on the float degrading to the point they break off, causing the entire module to become inoperable.

Originally, revised editions of the senders were created that used a float design that solved most of these issues. Digital versions either don’t exist or are NLA. The Analog versions can still be found but are quickly increasing in price and scarcity.