Power loss on Diesel engine

[MemoriesByTheMile]

In our SuperC we have a Cummins ISX 15/600 which during our 2.5 yrs of ownership has been problem free, until the most recent trip.

While climbing small mountains in AR I noticed a power loss and if I tried to push it harder would see a check engine light. Hmmm…

After another stop, the power loss was more severe. Was getting nerve wracking. Immediately thought of all the DEF failures I have only read about — but this problem was only occurring under heavy acceleration. Just didn’t seem like a DEF failure.

Thought about DPF derating I read about, didn’t seem like this matched those symptoms.

Limped to our next stop, running the hazard flashers as speed was stopping to drop there was ANY upward slope to the road. After setting up and settling in, started looking things over and made an appointment to get checked out at a diesel shop - but they were scheduled for a couple weeks out.

In the meantime, started googling and reading. Thinking back my Bride recalled that the 2 most recent fuel stops she saw the tanker trucks filling the underground storage.

Since the loss of power was during heavy acceleration or heavy pulling, maybe the engine was starving? Air? Fuel?

Checked the air filter and it was a little dirty, ordered one. Also ordered both the primary and secondary fuel filters for our engine.

After replacing both the air filter and fuel filter - and a prayer - test drive showed full power was back.

Now we are carrying spare fuel filters, in case we get another tank of bad fuel.

Also, if we see the tankers filling the underground storage, will get back on the road. Nice to know we swap out fuel filters in 10-15 minutes and solve the problem, but want to avoid the cost of those 2 filters and aggravation if possible.

 

[Rich W.]

I’ve heard over the years that filling the underground tanks stirs up all the crud in the bottom of the tanks and if you get fuel during this stirred-crud period you risk just such a situation. I usually avoid it but sometimes out of laziness I‘ve just disregarded the issue and fill up anyway. I think I pay closer attention now.

 

[MemoriesByTheMile]

I am assuming it was just crud that got stirred up.

In googling this the other thing that could have been the case (assuming it was fuel) would be water mixed in. But when draining the water separator filter I didn’t see any water.

Was very happy that new fuel filters fixed it and that it wasn’t a failing turbo.

 

[DennisT]

We did the same thing when we were riding Harleys. If they were filling the tanks we would find another station to fill up.

Glad it worked out and a good tip for carrying spare filters just in case.

 

[Buly]

That’s why I installed a vacuum gauge on my filter. It gives me indication of the filter is loading up, and it is time to change. Already saved me once from getting into some long steep grades with partialy loaded filter.

 

[Bob K4TAX]

Look at it this way, the fuel filters kept the crud out of the injectors and the engine. Now that would have been an expensive service call.

Bob

 

[Rich W.]

Got a pic of that installation? I found a bunch of gauges on line but not sure where it would go.

 

[Buly]

Got a pic of that installation? I found a bunch of gauges on line but not sure where it would go.

You can find the gauges at places that sell Racor fuel filters. They are made by Parker Hannifin. One of the pointers will show the highest vacuum point and stay there until is reset. When it moves into the yellow zone, it is time to start thinking about changing the filter.

 

[Rich W.]

Thanks. I think thats a great idea.

 

[MemoriesByTheMile]

Love the gauge idea - now just need an electrical extension so I can mount it on the dash with all the other gauges.

 

[Jim]

Put me in the group of having had this happen in our previous MH. But unfortunately, it cost me $800 in mobile tec bills to find the solution.

 

[Rich W.]

Put me in the group of having had this happen in our previous MH. But unfortunately, it cost me $800 in mobile tec bills to find the solution.

Happens on boats that haven’t been in rough water for a long time. Get them out to sea and it stirs up all the crud in the tanks, then your in the bilge breathing diesel fumes, changing filters, in rough seas. Not all that much fun. That’s why they “polish” diesel in boats.

 

[Jim]

Happens on boats that haven’t been in rough water for a long time. Get them out to sea and it stirs up all the crud in the tanks, then your in the bilge breathing diesel fumes, changing filters, in rough seas. Not all that much fun. That’s why they “polish” diesel in boats.

In my case, I was coming back from Blue Water Key and had experienced -0- mechanical problems along the trip. That said, I had every other problem that one can imagine (including ants), but that's another story.

I remember the nasty place we stopped for fuel and I knew it was not right when I pulled in. But I was going into a busy stretch ahead, and it was either stop here or 100 miles away, and I was already under 1/2 tank. So I stopped and fueled up. And then I stopped again in about 50 miles when the filters clogged up enough that Freightliner put up one of those codes that can be one of a dozen different things.

The mobile tec had one price that he charged. It was $85 for the call, $85 to hook up his code reader, $85 per hour (5-hrs), $85 for the filters, and a couple of $85's just for the hell of it. Interesting enough, his business was called "Affordable Diesel Service." lol

So yeah, it was an expensive lesson learned. A friend who drove trucks for a living, told me that the displayed code is a frequent one and is cured 95% of the time with new filters. We bought several of each, and carried them with us for the rest of the coaches time with us. Never needed them though, and passed them on the the new owner when he purchased the coach.