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Old 11-23-2006, 11:51 AM   #1
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Question How do I cut off the engine

1994 Airstream motorhome with a cummins pusher. Turned the engine on check it and make certain all is ok. We have had a long period of rain and there was some leaks around the windshield area. When I went to cut off the engine it would not secure. It has been running for 24 hours and I really don't want it to cut off because of lack of fuel. Any suggestions?

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Old 11-23-2006, 12:04 PM   #2
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Turn off the fuel or the air that is the only way to shutdown a diesel. Usually they turn off the fuel. Has it overheated yet?
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Old 11-23-2006, 12:08 PM   #3
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it is running cool, no problems with overheating, the unit is at a friends house he has just had knee replacement and has difficulty getting in the engine compartment. Has already tried cutting off air supply but has been unable to completely starve it.
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Old 11-23-2006, 12:22 PM   #4
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If it has a electric driven pump, disconnect the wires. Engine driven? Disconnect the incoming fuel line. Not outgoing. drain the fuel tank? trying to cutt of the air could risk having something sucked into the engine.
Find the shutoff valve and manually close it. I am out of suggestion at this time...
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Old 11-23-2006, 12:38 PM   #5
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Its a mechanical fuel pump and he is not physically able to disconnect the fuel line. Its a bear when your physical ability limits what you can do. If it were straight shift he could stall the engine, not easy to do with an automatic which is mired in mud.
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Old 11-23-2006, 04:16 PM   #6
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Cummins

Okay, been a while since I drove diesel simis, however, if it is the usual cummins PT Pump there may be a lever on the pump that switches from electric to manual. If so, try switching that. If not, the on off switch to the pump used to require voltage to hold a ball suspended that allowed fuel to flow. Try disconnecting the batteries. It could be that the ball is gummed up and won't drop into place to block the fuel flow, try tapping on the pump with a hammar. TAP, don't strike. If none of that works, disconnecting the fuel line coming into the pump will stop the engine for sure, however you will want a container to catch the fuel until the fuel pump stops.
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Old 11-23-2006, 04:33 PM   #7
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Thanks I have passed this information to my friend with the problem. It may have run out of fuel by now.
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Old 11-23-2006, 05:19 PM   #8
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It is probably the fuel shut down solinoid stuck in the on position , it is just foward of the fuel filter , pull down on the rod that comes out the bottom . If he has a manual it will show a picture of it's location , drivers side of the engine .

P.S. It looks like a small canister , about 1-1/2" dia.,with a bellows below and a rod coming out the bottom. Good luck
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Old 11-23-2006, 05:37 PM   #9
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Here's a picture
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Old 11-23-2006, 05:39 PM   #10
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Try again
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Old 11-23-2006, 05:42 PM   #11
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Sorry , can't get it to work
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Old 11-24-2006, 10:52 AM   #12
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On my dashboard I have a handle which I pull to stop the engine. This handle cuts the fuel supply. Is it possible such a handle is also on your dashboard?
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Old 11-24-2006, 08:04 PM   #13
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He couldn't find a kill swithch on the dash, it has run out of fuel and is secured at the present time. Thanks for all the help. I guess I need to look at my new cummins and see how I would shut it down if it happened to me. I am pretty sure it was a problem with the fuel shut down valve.
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Old 11-25-2006, 08:34 PM   #14
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Kent, are you sure the handle is a fuel shutoff? I thought that was a compression release... If it's a fuel shutoff I've given someone some bad info regarding cold weather starting.
I have had some older semi tractors that had a compression release to aid in cold starts as you could get the engine turning before adding fuel and ignition.
Please correct me if I've been wrong.
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