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Old 07-27-2018, 07:04 AM   #1
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Help me

2006 Itasca Meridian with cat 350 engine. I did a complete filter change. Now seems to be a fuel problem? Engine cranks, idles good for 10-12 minutes and then chokes down and dies. Frustrated, please help me.
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Old 07-27-2018, 10:12 AM   #2
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First thought: Have you done this before?...successfully? Second: Hope you replaced each fuel-filter with the exact replacement. Third: Was there any black goop present at the top of the removed filters? Forth: Is there a chance you either left-off or left-in-place a rubber gasket when installing the new filter? Finally, with previous filter-replacements, have you run the engine at idle successfully for this length of time (i.e., wondering if an auto-shutdown timer is being reached)?
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Old 07-27-2018, 03:36 PM   #3
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I drove trucks for 40 years and changed hundreds of fuel filters. First thing I learned and very important was when you fire it up you should fast idle it around 1000rpm. This may or may not help on the newer engines but is what I still do on my 2002 cat 3126 and it always continues to run smooth after about 3-5 minutes of this. Good luck!
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Old 07-27-2018, 05:55 PM   #4
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Sounds like air in the fuel lines/filters. re-check the filters you put on. Did you fill the filters with fuel before you put them on?
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Old 07-27-2018, 06:00 PM   #5
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If you are on regular idle and not a fast idle, then my bet is it is timing out and shutting down. I just had a new ECM installed in my coach and the cummins tech programmed it to shut down automatically after low idling for 15 mins. So I agree with Robi.


Also, have you driven it? How does it perform? There isn't enough fuel in the filters to run it for 10-12 minutes so if it is a fuel delivery problem, then it would die much sooner.
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Old 07-27-2018, 07:46 PM   #6
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He has a CAT 350.
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Old 07-28-2018, 01:32 PM   #7
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Quote:
Originally Posted by dnystrom View Post
He has a CAT 350.
EXACTLY!

And there is NO "AUTO SHUT DOWN" programmed into these CAT engines on motorhomes.

To the OP, this issue is difficult to analyze accurately without being there. When I had my "no start" condition after changing my one and ONLY fuel filter, I realized that ALL my fuel had drained back into the tank. And because I was stupid enough to follow the CAT instructions in one of the books that came with my motorhome that stated to NOT PRE-FILL THE FILTER, that contributed to my no-start condition.

So, long story short, I had my wife use our home air compressor we put a blow down tip on the air line right at the fuel inlet and sealed the area tightly with rags. I then had her pull the trigger on the nozzle and I waited at the fuel filter inlet for fuel. Yep, here it came. I had already filled the filter. I then installed the full filter. But, still, a no-start condition existed.

So, I removed the fuel entry line that's at the base of the HEUI pump. I had her pressurize the tank again. I waited and, there it came, fuel. I quickly installed that line at the base of that HEUI pump. I then cranked that engine for about 5-6 seconds and, it began to fire off. After about another 5 seconds of cranking, it was purring like a big CAT should.

Well, I never, ever wanted to encounter that situation again. So, I installed shut off valves on each side of the fuel filter housing. Now, I can take my time in changing that filter with ZERO issues of starting or running.

So, while I'm not CAT engine specialist, to have your engine start, run for a short time, and shut down, repeatedly, is a tough one to answer. As has been suggested, it's possible you MAY have some air in the lines and the engine is having a tough time processing that air, 'till it's a solid stream of fuel from the tank to the injectors.

In all the time I've owned this CAT, I've never, ever read where "High idle" is required or even suggested. I've "heard" that it's better for a CAT to high idle when prepping to get underway. Again, never seen it in writing. So, to cure your problem, I'd do maybe one of two things. First, I'd try what's been suggested and that is, once you fire that beast up, immediately take it for a drive. That allows for more fuel to be processed and, potentially alleviating the "possible" air in the lines.

Second, if you're not up for driving it, once it's started, immediately go to a high idle. And, if it continues to do it's timed shut down, I'd continue to do that procedure a few times, to see if things clear up. Let us know what you find out.
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