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Old 05-02-2015, 11:08 PM   #1
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Motorhome will not shut off

My 1996 Fleetwood Discovery would not shutoff. I killed all electrical power to the coach---no help. I finally disconnected the fuel line to the filter & starved the engine. Now I've got to fix it. I'm stuck in Boise Idaho on a Saturday night. Help!
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Old 05-02-2015, 11:24 PM   #2
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Diesel engines will run until the fuel is shut off. You did it manually.
There is a device that controls the fuel feed...find and fix that.

Best luck
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Old 05-02-2015, 11:24 PM   #3
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I am assuming it is a diesel pusher, Cummins 5.9 with mechanical injection. If so your fuel shut off solenoid is stuck, happened to me with our old motor home. The solenoid is mounted on the pass side of the engine with a linkage to the injector pump and an electrical wiring harness hooked up to it. If you jiggle the linkage to the injector pump it should snap shut and kill the engine. With mine all I did was lube the linkage and solenoid and never had another problem. If it's a computer controlled injector system forget what I just said.

Good luck!
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Old 05-02-2015, 11:27 PM   #4
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What mdpuff said!



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Old 05-02-2015, 11:30 PM   #5
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Diesel ? Cummins ?
If so , some members have had problems with a diode in the alternator wiring failing and allowing voltage back into the rest of the ignition system , by-passing the ignition switch and powering the fuel shut off solenoid , keeping the engine running.
To test if this is your problem, disconnect the small wires from the alternator ( you wont get output from the alternator ) but if the engine runs and shuts down the diode is your problem. Usually mounted within 6>8" of the alternator.
There is also a control relay for the fuel solenoid, that could be stuck.
Please re-post if you don't have a diesel.


EDIT: I see a bunch of other members type faster that I do.
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Old 05-03-2015, 12:12 AM   #6
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Another member with a starter problem posted this picture the part on the right is the fuel shut off solenoid, and the control relay is the part in the centre .
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Old 05-03-2015, 12:30 AM   #7
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Quote:
Originally Posted by Scarab0088 View Post
Diesel engines will run until the fuel is shut off. You did it manually.
There is a device that controls the fuel feed...find and fix that.

Best luck
Three things a diesel needs, air, fuel and compression. Remove any one and they stop.
Some old diesels had an air shut off for just such a contingency since they could suck oil out of the crankcase and continue to run even with the fuel shut off.
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Old 05-03-2015, 10:40 AM   #8
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I'd unhook the fuel shut off solenoid at the injection pump to shut it off.

option 2 You can use a CO2 fire extinguisher to shut it off as well. (With no harm I might add) You spray the air inlet/air filter.
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Old 05-03-2015, 12:43 PM   #9
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The same thing happened to me. Freightliner in Gaffney fixed it by replacing the solenoid. Interim quick fix was to pull a fuse - your road service tech guy or mobile mechanic might be able to tell you which one.
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Old 05-03-2015, 09:35 PM   #10
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Next problem is to get it restarted again. When you pulled off the fuel line you introduced air into the system. Read one of the many posts about how to bleed the air out of the fuel line for your particular engine. I can guarantee it will not start again until you have done this.
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Old 05-04-2015, 06:35 AM   #11
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I had a similar problem. Disconnect the connector at the fuel shut off solenoid. Then the problem turned out to be the diode for the exciting wire to the alternator
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Old 05-05-2015, 09:31 PM   #12
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Motorhome will not shut off

OK, folks---the problem of not shutting off was that the linkage between the fuel shutoff solenoid & the injector pump plunger fell off, not allowing the engine to shut off. We fixed that but the solenoid was weak so the plunger would fall down, lowering the idle rpms until the engine died. So, after a $2000+ solenoid replacement & two day delay, we're back on the road. Throw in a $350 tow job. (The solenoid itself was over $1000)
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Old 05-06-2015, 06:39 AM   #13
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$$$$$$ Seems excessive.
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Old 05-06-2015, 08:36 PM   #14
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Do you have a part # for that solenoid, and possibly a picture of it?

Jim
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