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Scott P. · 05-28-2003, 04:41 PM

I have a Cummins 8.3CTA (non-Newell) that occasionally wouldn't shut down. Key on, key off, keeps running. A bit unnerving the first few times it happened.

The Cummins utilizes a fuel shutoff soleniod that pushes on the shutoff lever of the fuel pump when the engine is running. Age and vibration wore a small dimple in the lever, so that even when the solenoid was deactivated, the plunger would hang up in the dimple and never shut off the fuel. The short term fix was to tap the plunger with a hammer to get it to shut down. The real fix was to weld over the dimple and grind the lever smooth again. A 991 5/28/2003 11:11:26 AM 5/31/2003 John Leuenberger jeleuen@attglobal.net tachometer 1987 8-92 Tach frequently erratic on my '82 6-92 but haven't gotten around to figuring the cause as of yet. Maybe to be expected due to age.

05-28-2003, 04:41 PM	#2
Scott P. New Member Join Date: Feb 2008 Posts: 5	I have a Cummins 8.3CTA (non-Newell) that occasionally wouldn't shut down. Key on, key off, keeps running. A bit unnerving the first few times it happened. The Cummins utilizes a fuel shutoff soleniod that pushes on the shutoff lever of the fuel pump when the engine is running. Age and vibration wore a small dimple in the lever, so that even when the solenoid was deactivated, the plunger would hang up in the dimple and never shut off the fuel. The short term fix was to tap the plunger with a hammer to get it to shut down. The real fix was to weld over the dimple and grind the lever smooth again. A 991 5/28/2003 11:11:26 AM 5/31/2003 John Leuenberger jeleuen@attglobal.net tachometer 1987 8-92 Tach frequently erratic on my '82 6-92 but haven't gotten around to figuring the cause as of yet. Maybe to be expected due to age.