Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Fuel Level Sensor: Testing and Inspection




1. Connect the sender with a test lamp (12 V, 3.4 W) to the battery and immerse it in the water.
2. The lamp should be off while thermistor is submerged in the water, and should be illuminate when the sender is taken out of the water.

NOTE: If there is a malfunction, replace the fuel sender as an assembly.

CAUTION: After completing this test, wipe the sender dry and install it in the fuel tank.