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Cummins 262 engine not shutting off

Posted By Peter Langdon Wednesday, January 19, 2022 1:57 PM
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Peter Langdon
 Posted Wednesday, January 19, 2022 1:57 PM
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The engine in my Autocar has started continuing to run, but at low rpm & lumpy when the ignition is turned off. The solenoid valve is working correctly. The only change since this started is the installation of a new fuel tank. the return line from the pump is teed into the rail return at the rail. This is because the new tank can only accept one return line. I have seen other 262 Cummins with the PT pump set up the same way. The return lines are clear with no restrictions. So I don't see how this can be the problem, but...... Any ideas or knowledge would be much appreciated.
jimfols
 Posted Wednesday, January 19, 2022 3:44 PM
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If you're sure it's not a restriction in the return line. It could be an injector check ball.

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Jim
Peter Langdon
 Posted Thursday, January 20, 2022 3:43 PM
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Thank you!
Newto
 Posted Thursday, January 20, 2022 5:11 PM
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If you undo your new line that you teed into the return rail and either let it dump into a bucket orrrr make a mess and let it drain to the ground if the engine still runs on then it is as Jim said...probably an injector check ball or maybe a centre oring gone on an injector.

You can isolate the bad injector by holding the injector rocker lever fully down so the plunger is bottomed in the cup while someone else turns the engine off.....do it for each injector.....the bad one should show up by allowing the engine to stop straight away.

Make sense???

Newto
Peter Langdon
 Posted Friday, January 21, 2022 1:20 PM
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Yes it does. Thank you.
glenn akers
 Posted Wednesday, January 26, 2022 4:47 AM
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Also remove the fill cap on the tank and see if this helps.

glenn akers

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