Cummins Generator Error Code 311: How to Fix It

Q: Can I drive with error code 311?

No, this error indicates a problem with cylinder #1 injector. Continuing to run the generator can cause engine damage or poor performance. Address the issue immediately.

Q: Will error code 311 clear itself?

The error will likely remain until the injector issue is fixed. After repair, the code may clear after a few successful starts or require a manual reset via the control panel.

Q: How much does it cost to fix Cummins error 311?

DIY cost is typically $100-$300 for a new injector and gaskets. Professional repair may cost $300-$800 depending on labor rates and accessibility.

Q: What causes injector failure on a Cummins generator?

Common causes include contaminated fuel, age/wear, electrical faults, or carbon buildup from poor fuel quality.

Q: Can I clean the injector instead of replacing it?

Cleaning may work for mild clogging, but if the injector is internally damaged or electrically faulty, replacement is the only reliable fix.

Abstract

Error code 311 on a Cummins generator means there's a problem with the fuel injector in cylinder #1. This can cause rough running, reduced power, or failure to start. The issue may be electrical (wiring or connector) or mechanical (clogged or faulty injector).