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Old 05-28-2015, 01:28 PM   #1
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Ran fine, then died

This is a C-Series Cummins in a 1994 Class A motorhome. I fired it up the other day and it started Bang(!) right away like always. Ran for maybe five minutes, happy idle, then shut down. Wonít start again. It cranks great, tries hard, but not even a cough. No smoke. I suspect the fuel cutoff solenoid but I manually blocked it open and no difference. Here is one clue, as I crank there is no movement of the tachometer. Normally when cranking the tach will show a few hundred RPM but now nothing. Canít find a single fuse or breaker that isnít working. Ideas?
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Old 05-28-2015, 01:35 PM   #2
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Sounds more like a fuel problem. I would check/replaceable filters. If a diesel has fuel it will run.

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Old 05-28-2015, 01:40 PM   #3
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Sounds more like a fuel problem. I would check/replaceable filters. If a diesel has fuel it will run.

LEN
It has new filters. Even with old bad filters it would cough and try to start.
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Old 05-28-2015, 01:44 PM   #4
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It has new filters. Even with old bad filters it would cough and try to start.
I think that's the problem. Did the new filters get filled with fuel before starting it the first time? If not, then it ran until the air gap from the filters got to the engine, now it won't start with air in the line.
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Old 05-28-2015, 01:49 PM   #5
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It has hours of run time since the new filters went on.
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Old 05-28-2015, 01:53 PM   #6
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It has hours of run time since the new filters went on.
Darn. That makes it more difficult to solve. Going back to the tachometer clue, can you test for voltage at the injector pump or fuel solenoid?
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Old 05-28-2015, 02:00 PM   #7
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Manual injection, and I manually operated the solenoid.
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Old 05-28-2015, 02:18 PM   #8
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Manual injection, and I manually operated the solenoid.
After my Ford truck and IH tractor with manual injection run out of fuel, I have to crack the injector lines open where they go into the cylinder. Then I crank the engine until all of them are wet with fuel. Once they're wet, I know fuel is getting to the injector and they usually fire right up. Both of them have someone else operating them for snow removal. I can't seem to find someone who can read a fuel gauge when plowing, so it happens more frequently than it should.

Loosening the fuel line will also confirm that you're getting fuel to the injectors.

Is it possible that you're out of fuel? Or if your fuel pump is upstream from the tank, a crack in a fuel line or a loose connection will allow it to suck air and prevent it from starting.

With mechanical fuel injection, it's almost certain that it's a mechanical problem. Fuel isn't getting from the tank to the injectors. Either it isn't there in the first place, air is getting in the line to replace it or it's getting stopped before going into the engine.
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Old 05-28-2015, 02:23 PM   #9
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After my Ford truck and IH tractor with manual injection run out of fuel, I have to crack the injector lines open where they go into the cylinder. Then I crank the engine until all of them are wet with fuel. Once they're wet, I know fuel is getting to the injector and they usually fire right up. Both of them have someone else operating them for snow removal. I can't seem to find someone who can read a fuel gauge when plowing, so it happens more frequently than it should.

Loosening the fuel line will also confirm that you're getting fuel to the injectors.

Is it possible that you're out of fuel? Or if your fuel pump is upstream from the tank, a crack in a fuel line or a loose connection will allow it to suck air and prevent it from starting.

With mechanical fuel injection, it's almost certain that it's a mechanical problem. Fuel isn't getting from the tank to the injectors. Either it isn't there in the first place, air is getting in the line to replace it or it's getting stopped before going into the engine.
When this happens to you does your tach stop working?
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Old 05-28-2015, 02:26 PM   #10
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When this happens to you does your tach stop working?
I never noticed.
But, the truck doesn't have a tach. The IH Tractor has a mechanical tach so it ought to work.
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Old 05-28-2015, 02:48 PM   #11
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Lift pump or injection pump problem. Crack the fuel line leading to the injection pump and see if you are getting fuel to the pump, if not the lift pump is the issue, if you are than it's an injection pump issue.
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Old 05-28-2015, 07:47 PM   #12
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The mechanical c 8.3 only needs fuel & air to run. If the fuel solenoid is held open it should start regardless of any fuse or electrical situation. I suspect a lack of fuel is the culprit.


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Old 05-28-2015, 08:38 PM   #13
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Check the fuel injection pump. The neighbor had the same problem this last winter and after replacing the injection pump, it ran just fine.
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Old 05-29-2015, 01:52 PM   #14
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Check the fuel injection pump. The neighbor had the same problem this last winter and after replacing the injection pump, it ran just fine.

OK. Can you explain how that keeps the tach from working?
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