Can old fuel cause the engine to go into limp mode?

Good morning,

Yes, old fuel will cause this issue.

https://www.2carpros.com/articles/reduced-power-limp-mode

The tank should be dropped and flushed out of all the old fuel and I would replace the fuel pump as well.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

You also could drain the tank from the back seat as well to get the old fuel out. I attached that as well.

Roy

DRAINING FUEL TANK

1. Perform the fuel system pressure release procedure See: Fuel Pressure Release > Procedures > Fuel System Pressure Release Procedure
2. Remove the fuel pump module See: Fuel Gauge Sender > Removal and Replacement > Fuel Pump Module - Removal
3. Using the Fuel Chief Gas Caddy 320-FC-P30-A or an OSHA approved gas caddy, evacuate the fuel tank.

REMOVAL

1. Release the fuel pressure, refer to the Fuel Pressure Release Procedure. See: Fuel Pressure Release > Procedures > Fuel System Pressure Release Procedure
2. Disconnect negative battery cable.

NOTE: The fuel level of the vehicle must be below 5/8 of a tank before you remove the module lock-rings. If it is above that you can spill fuel in the vehicle.


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3. Drain partial fuel from fuel tank through the filler tube. Use a hard nylon tube, with a 30° cut on the end, to push the check valve open to drain fuel from tank.


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4. Remove the rear lower seat cushion.


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5. Push seat back and up to remove seat cushion.


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6. Fold back the foam pad covering access cover for modules.


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7. Remove plastic access covers from floor pan right side.


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8. Disconnect the fuel supply line from module.
9. Mark the module orientation.


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10. Use special tool #9340 to remove right side module lock ring.


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11. Drain fuel from right side of fuel tank. Lift module up enough to push hose into tank and drain. Do not spill fuel in interior of vehicle.


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12. Disconnect the electrical connector from left side module.
13. Mark the module orientation.


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14. Use special tool #9340 to remove left side module lock ring.


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