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 > ISC 350 will not run. Starts but quits after 45 sec.

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Burfman

Phoenix, AZ

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Posted: 11/06/11 03:18pm Link  |  Print  |  Notify Moderator

I have a '99 CC with the ISC 350 in it. When i start the engine it is hard starting, takes about 3 attemps with a long crank, (20+ seconds) and once it starts it quits after about 60 seconds. I first found the lift pump leaking so i thought that was the problem. Fixed the leak, put in new fuel filters and still have the same issue. Any thoughts out there?

Thanks,
BIll


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scooter4

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Posted: 11/06/11 03:46pm Link  |  Print  |  Notify Moderator

Sounds like your sucking air, and running out of fuel. Make sure your primary filter is not lose, check for fuel leaks from tank to engine.


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generalexam

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Posted: 11/06/11 03:52pm Link  |  Print  |  Notify Moderator

scooter4 wrote:

Sounds like your sucking air, and running out of fuel. Make sure your primary filter is not lose, check for fuel leaks from tank to engine.

Hard to beleive he would have a loose Primary filter as the problem was there before and after replacing filters.sounds more like a injecter driver or injecter pump problem to me

Burfman

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Posted: 11/06/11 03:58pm Link  |  Print  |  Notify Moderator

No leaks that i can see and i agree it is a loss of fuel. I just can't figure why. We just came back from a 3000 mile trip without any issues. Parked it and went to start it to head out to NASCAR and now this...

scooter4

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Posted: 11/07/11 05:45am Link  |  Print  |  Notify Moderator

generalexam wrote:

scooter4 wrote:

Sounds like your sucking air, and running out of fuel. Make sure your primary filter is not lose, check for fuel leaks from tank to engine.

Hard to believe he would have a loose Primary filter as the problem was there before and after replacing filters.sounds more like a injecter driver or injecter pump problem to me
Believe it or not it happened to me. Changed my primary filter not realizing the nipple on the base gotten loose. Had a hard time starting, and than it started to leak.

scooter4

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Posted: 11/07/11 06:01am Link  |  Print  |  Notify Moderator

Could it be, you picked up some bad fuel or some algea built in the tank from the water. I would check your water separator or change it just to be sure and re tigten your primary.there is a closed nipple in the filter base and when I removed the old filter it most have loosened up. To make a long story short I broke down on I10, fuel all over the engine,the back of the coach and my toad was covered. What a mess and about 35 gal. gone. Let us know what the problem was once you find it.
Scooter.

* This post was edited 11/07/11 10:51am by scooter4 *

wolfe10

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Posted: 11/07/11 06:11am Link  |  Print  |  Notify Moderator

I think scooter4 means algae, not allergy. Algae (actually bacteria) would show up in the primary filter as a black precipitate. If really bad, it will be slimy black. A BIOCIDE from any marine store will kill it, but the bodies in the tank will still clog filters until they are finally filtered out of the system.

Storing with a full fuel tank and using a biocide if storing over a couple of months goes a long way toward eliminating this as an issue-- unless you get a tank of contaminated diesel.


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Lobstah

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Posted: 11/07/11 06:22am Link  |  Print  |  Notify Moderator

I ran into this on our boat once. I ended up taking a CLEAN bucket of fuel, disconnecting the line off the fuel filter that led to my pump, and placing the line in the bucket. Bled the system, everything ran fine. Put the line back on the filter, took the next piece of line off, and kept chasing line connections until I got to a T fitting for my fuel tanks...that had vibrated loose, and was allowing air to be sucked into the system. Because it was above the height of the tanks, it didn't really leak fuel, just allowed the pump to suck air.
Few turns with a wrench, problem solved. Of course, when I discovered it, I realized my first step should have been to just check every connection/fitting in the fuel system, would have been much quicker.
But still not a bad way to diagnose a problem. Once you KNOW it's "air"...you can chase it down.

Jim


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jtfcons

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Posted: 11/07/11 03:56pm Link  |  Print  |  Notify Moderator

A weak or faulty fuel shut off solenoid could also cause the symptoms described. Something else to check. Manually hold the solenoid on when cranking (with a helper). If it starts immediatley, and stays running, there you go.


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Burfman

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Posted: 11/08/11 09:51am Link  |  Print  |  Notify Moderator

First off thanks to all of you for great advice. I have been a mechanic all my life and it gets to me when I can't figure out what I feel is a simple problem. I changed both fuel filters and both had what I would call good clean fuel in them, no evidence of black algie. I repaired the gasket on the lift pump and it doesn't leak any more but I still have the same problem. Many long cranks to get it started and then it finally coughs to life and idles normally for about 45 seconds and then coughs again and quits. I can find no leaks any where and I have been all over the coach. I finally gave up and put it on the hook and sent it to Cummins. They will get to it on Wed. so I can then update all of you as to the issue. I guess I should'nt complain as I have put just over 100,000 miles on this coach and this is the first engine issue I have had.

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