12 valve won't keep fuel pressure

[Tanner lauricella]

A warning, you can burn up the solenoid with continued long cranking. The pull-up side is designed for momentary operation with a quick start. If you need to crank it a long time, unplug the solenoid and tie it up.

Has there been any work done to it lately? Have you cracked open one of the injector lines to see if your getting fuel to the injectors? It’s really a simple system. You need to verify you’re getting fuel to the injection pump, then that you’re getting fuel to the injectors, and report back.

Yes sir I'm getting fuel through the injection pump and to the injectors no there hasn't been any work done to it before it quit

 

[Tanner lauricella]

I have no clue how that could possibly give you an accurate fuel pressure reading. Then again, I don't know how an Airdog is plumbed. Somewhere between the fuel filter and the input to the injection pump is where you need to check fuel pressure.

You didn't answer about the OFV.

Just as a FYI, to check the FSS only requires one person. Attempt a start, leave the key on and check to see of the FSS arm is up. If it is not you push it up. Does it stay or drop back down when released? If it drops back down check the #9 fuse. If it doesn't go up when you try to start the engine it is the relay or the fusible link.

It stays up when you keep the key on sir

 

[Tanner lauricella]

An update I have went through and replaced all the hard lines and all the soft lines with all new fuel lines new fuel filters the only thing I haven't done is timing and that is what I'm fixing to jump into tomorrow I really appreciate all the help I will have an update after I am done doing the timing tomorrow

 

[GAmes]

It stays up when you keep the key on sir

I ask about the overflow valve and you answer about the fuel shutoff solenoid. Pressure back to the filter is not an indication of pressure into the pump. I recommend you read this, written by a long time member of the TDR. (3) Joe G's fuel system writeup | Cummins Diesel Forum (cumminsforum.com)

How did you get to timing if there hasn't been any recent work done? Timing doesn't slip for no reason.

 

[BigPapa]

The fellow I sold my truck to is having a no-start problem. He's called and texted me NUMEROUS times. The truck has been sitting a few months and then was vandalized. He's working alone and can't grasp how to pull the shut-off lever up and tie it off. He couldn't find the primer button on the lift pump. He has "friends that know about diesels" telling him his in-tank pump is bad....

My guy called and said he'd finally got the truck running. He finally removed the Shut-Down Solenoid and pulled the plunger up and tied it off as I'd told him to do SEVERAL times. I told him it looks like the solenoid wasn't working properly.

He tells me one of his friends who was a Dodge "Guru" had told him it was probably the "Mobility Switch". He said the trucks have them but Dodge doesn't include it in any parts diagrams or service manuals because it's a "Trade Secret". It's supposed to be an anti-theft device. I told him there was nothing of the kind on the truck and he proceeded to argue with me. I told him I'm glad he got it running and blocked his number....

 

[GAmes]

Some people are just prone to believe nonsense. I've blocked members for the same reason.

 

[petersonj]

He said the trucks have them but Dodge doesn't include it in any parts diagrams or service manuals because it's a "Trade Secret". It's supposed to be an anti-theft device.

I am certain there is one of these on my truck. There are two reasons why I think this. One, I can't find the "Mobility Switch" - the other, my truck has never been stolen. So, it's got to be on there.

- John