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

RUTHLILLY

MEMBER
2009 CHRYSLER 300
3.0L
V6
TURBO
2WD
AUTOMATIC
98,000 MILES

I have the car listed above 300c that has been sat for a couple of years. It’s now been fixed and had an mot. It keeps going into limp mode. My question is, can old fuel cause it to go into limp mode?

Tuesday, March 9th, 2021 AT 12:26 AM

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

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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