Originally Posted by Bob (WA0MQE)
I've read that Cummin's says when your engine has sat without being run for a long time they recommend disconnecting the +12volt lead going to the Fuel Cut-off and then crank the engine with the starter until you see the oil pressure rise on the oil pressure gauge.
They even recommend to make it easier to put a switch in line so you don't have to pull the wire off.
My question is does anyone know where this Fuel Cut-off valve/solenoid is? What does it look like?
I'm curious... Do they specify how long "a long time" is?
Every time I start mine, it takes a second or two before the oil pressure comes up. Doesn't matter if it's been sitting a day or a month.
BTW... previous poster is correct. Your fuel shut off solenoid is mounted to the side of your fuel pump, next to your injector rail, pointing downward. This means that looking from the top, all you'll see is the butt end of it. What you'll see from the top is a round cylinder about 2 inches in diameter mounted in a metal bracket with wires coming out of the backend. The wires are only about 8 inches log and plug into the wiring harness. This is where you disconnect it.
The other end of the solenoid has a plunger with a connecting shaft that connects to the fuel control valve. You probably can't see that side, but you should be able to reach around the mounting bracket a feel it.
Also, the solenoid has two circuits a Pull circuit, and a hold circuit. The Pull circuit engages a fairly strong electro-magnet that retracts the plunger when you turn the key on. Once retracted, the hold circuit takes over to hold the plunger in place. If you install a switch you'll need to test which wire is the "Pull" wire ... Or I suppose you could install a double throw switch and just shut both the Pull and the Hold circuits off.
Hope some of this has been helpful.