CiES Capacitive Fuel Senders

Overview

Aftermarket capacitive fuel level senders that replace the standard IE F-385B float-type senders. Popular replacement that eliminates the right-tank orientation and calibration issues described on SECTION 21: Fuel Sender Assembly.

Parts Required

• CiES fuel senders (specify RV-15 compatible model)
• (Optional) Raychem D-436 splices (for extension wire routing) *** Not necessarily required depending on your wiring. ***

Installation Notes

• Install in place of the standard IE F-385B senders during Section 21.
• DO NOT FORGET to attach a ground wire to one of the mounting screws. Make sure to burnish the sensor case to achieve a good ground.
• (Optional) Route the sender extension wire using Raychem D-436 splices.
• Capacitive senders do not have an orientation-dependent float arm, eliminating the right-tank issue.
• NOTE: The native CiES sensors are FREQUENCY based.
• Verify compatibility with your EFIS/fuel gauge system before purchasing.
• One builder used the CiES gasket instead of proseal at the sender flange (same gasket approach running leak-free for years on a Cessna install). Source — includes a G3X wiring diagram photo

Sources

• MCA (Marc), VAF RV-15 #150046, post #75, May 2026
• Rocketman1988 (Bob), RV-15 #150026, June 2026