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It just won’t stop
I’ve got a 1985 Mirage XL. Runs great. Purrs like a kitten. My problem?
1. It won’t stop. Turn the ignition off, take the key out, disconnect the batteries, she just sits there idling like there’s no tomorrow. I have to go manually shut off the fuel line for it to turn off.
2. There’s a significant air leak in the Accessories Air Filter Drainage tank in the steering bay. I’ll be taking it out soon to see if it can be repaired, but if it can’t, any ideas on where I can buy a replacement? Thanks.
– Tom
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6 Replies
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If I had to guess I would say you have an air operated engine stop mechanism. I don’t know i the two issues are related.
This is just a guess.
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I agree, in the old days we had a manual setting on the injector pump, but yours is probably air or electric. Also, don’t know if that vintage had the rear run switch that worked with key off, take a look.
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In order to stop a running diesel engine you stop the delivery of fuel to injectors.
In a gasoline engine you stop the spark that fires the gas.
This may sound funny but ask some of your friends who own a diesel RV what stops a running diesel engine ?
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The bus in question has a pre-DDEC engine so the fuel shut off is possibly an air operated device. That is the first place I would look.
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The tank you are refering to has a history of leaking around /under straps.
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The early Detroit engines that were all mechanical used pneumatic shut off valves to kill the engine. When you turned off the key you would close a Skinner valve that was normally open. Then air would flow through the valve and work on a plunger that extended and turned off the fuel to the engine. If there is not enough air pressure to activate the plunger,or the plunger leaks air too badly, then the engine keeps running. The solenoid is mounted on the firewall above the engine.The plunger is mounted on what Detroit calls the “governor housing” at the top, rear of the engine. You would see it after you opened the engine doors directly in the middle of the engine in front of you. I will try to get you some pictures or diagrams.
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