: The low-pressure supply pump fails to deliver adequate fuel volume from the fuel tank to the high-pressure injection pump.

Spin on the new filters until the seal contacts the base, then hand-tighten an additional 3/4 turn. 3. Bleed and Prime the Fuel System

When the low-pressure supply circuit fails to maintain adequate fuel delivery, it causes fuel starvation to the high-pressure injection pump. To prevent damage to expensive common-rail components, the ECU will typically trigger a limp mode or reduce engine power output. Primary Causes of the L302 Fault

: Always prime the fuel system thoroughly using the hand primer or electric key-on cycle before cranking. Running the system dry will trap air and cause extended fault codes. 2. Check the Low-Pressure Fuel Feed Pump

Use the manual hand primer pump (or cycle the ignition key if equipped with an electric lift pump) to push air out of the system.

If the code is accompanied by a loss of function (e.g., the tractor won't move or the steering won't engage):

When the L302 error code appears on your Valtra tractor's display screen, you may notice one or more of the following symptoms:

This guide breaks down what L302 means, why it happens, and the specific steps you can take to resolve it with OEM-level precision.