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John: I have an 855, and I'm sitting here looking at the service book. I think you have a fuel shut-off solenoid that is not holding in after you release the key. What happens is that when you engage the starter, the fuel shut-off solenoid becomes energized, too. Then a voltage stays present after the key is released to keep it open. When you turn the key to the off position, the voltage drops, the fuel shut-off solenoid closes, and the engine stops. It could also be the mechanical adjustment of the solenoid linkage. The reason that your engine is starting and stopping at the release of the key is that there is a white wire that runs from the starter solenoid that supplied power to the fuel shut-off solenoid when cranking. On the mechanical linkage, you hold the solenoid in and fire the key. When you release the key, and then release the solenoid stem. If the stem stays in then everything is electrically fine, and it�s just that the linkage needs adjustment. It�s kind of long to go into here, so I�m going to guess your problem is electrical. There are several things that you can check. The fuel shut-off solenoid is located behind the right-hand side panel, and is the actuator near the pump that has the bellows on it. First test is that looking at the solenoid hit the key and see that the solenoid actuates. I'm guessing that yours will since it starts. Note if the solenoid falls out when you release the key. If it does there's the problem, and all you have to do is find out why the voltage is being interrupted. If no voltage at solenoid with key in run position, get a meter or 12V test lamp and trace the circuit. (Remember it could be as simple as a tired key switch.) There is a fuse in the fuse block, and I think it�s the top most one 10A. Check there on both sides with the switch on for power. Switch on should have power on both sides of fuse, if not replace fuse and test again. From the fuse block, the Yellow/Black wire will turn into a Pink/Black wire, which goes to the Fuel shut-off solenoid. Check there for power. Be sure to pull the wiring harness connector apart nearest the fuel shut-off solenoid and check there for water/dirt/crud/grunge/corrosion. That�s the simple stuff. If that doesn�t get you going, we�ll go into the rarer problems next. Frank-in-Tallahassee
70D // 855
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