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Old 01-01-2014, 11:44 AM   #1
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Unhappy diesel fuel solenoid

1992 Coachman Royal, 36', diesel, Spartan chassis. No power to fuel selinod EXCEPT in "start" position. Tech wired it closed to get me home. He thought it was a bad BD-2 battery control panel. Replaced that, same problem. Prior to this problem, had to use "emergency start" switch to get power to chassis. After it started, would run fine until next time to start. Latest problem with fuel selinod on injector pump happened going along I-40, had to be towed in.

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Old 01-01-2014, 11:59 AM   #2
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Did you check your chassis battery?

Then, there are some solenoids in your BCC that can develop carbon build up on the contacts and they can open circuit. They can operate correctly intermittently but will open circuit when it's unexpected. Next time you have the problem, whack them with a rubber mallet one at a time to see if that restores operation.

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Old 01-02-2014, 06:16 AM   #3
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The Tech at the repair shop checked most of that, batteries seem fine. I'm thinking relay or switch, just don't know where to look. MH has lots of relays in various locations.
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Old 01-02-2014, 07:39 AM   #4
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Not sure what engine or fuel system you have but if it is an inline pump the solenoid controls the shutoff lever on the fuel pump, they have two circuits in them. A high side to get it engaged and a low side to keep it engaged. The high side circuit burns out mostly due to the piston not being adjusted properly and staying on all the time. In that case it will not start unless you manually hold it open and start the engine. It will keep running until shutoff. If you have a rotary pump the solenoid is usually right where the fuel lines come out of the pump. These sometimes get small particles of debris in them and hang. It can be taken out and cleaned to be sure. If the solenoid is bad, the plunger and spring can be removed and you can get it to home or a repair shop but you will have to get creative to find a way to stall it out when you get there. I worked on fuel systems for a living, if I had a picture of your system I could give you specifics to yours.
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Old 01-07-2014, 05:31 AM   #5
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Typically there is a remote Starter replay that controls the Fuel Shutoff Relay, Its usually located somewhere in the Engine bay and looks like the older Ford Style. That Relay is activated by the ignition switch and signals the Fuel Shutoff relay to pull up in start position.
To find the relay trace the small wire from the relay mounted on the starter back up in the engine compartment to the Remote Relay and check or replace it, About $15.00 at NAPA. If this Relay checks out then replace Fuel Shutoff Relay itself.
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diesel, fuel

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