Cummins El Paso

Tom/Barb wrote:

smlranger wrote:

wolfe10 wrote:
When you changed the fuel filters-- what did you find?

Fuel poured out of any of my filters has looked absolutely fine. I have not cut any filter open yet. I always store the coach with a full fuel tank and I have been treating the fuel with BioBor (just in case) for the past year.

My issue this trip started after getting 50 gallons of fuel at a very busy Pilot and after driving over some really rough road in LA. That led me to suspect something stirred up in the tank.

I talked to my local Cummins shop in VA and they told me that some folks had reported similar issues and had switched their secondary filter to a 10 micron filter and the problem went away. My secondary fuel filter head has 7/8" stud and I have not yet located any 10 micron filters that will fit that head. My Fleetguard FF5636 is 2 micron. My primary filter is 10 micron. A friend with an ISC read a Cummins tech bulletin about fuel starvation on ISC's with 2 micron filters and recommended changing to 10 micron. He has done that and his similar issue went away.

I do not have any issue with oil consumption. I have never had to add oil between annual service except last year when I had a leaking valve cover and gear cover. That was fixed at Cummins.

When I had the coach at my local Cummins shop last year for the oil leaks, they were aware of the previous issue I had with low fuel pressure. They said they checked over everything and found no obvious issues. They ran the coach on their dyno for 3 hours and it ran fine.

I have never had any overheating issues. My coolant temp runs 186-188 until hard pulls when it may reach 195 for brief periods.

No chips. This is a bone stock 425ISL clean diesel (DPF).

In that case, forget the engine contaminating the fuel system, (our problems are not the same)
The 2 micron filters clog very easy. 2 micron is .0.00007874015748031496 inches. that is 98% of the particles bigger than that will be trapped. Many have gone to a 10 micron, and have no problems.

I have been browsing the net.... Baldwin, Wix, Donaldson, Fleetguard and I have not been able to find any 10 micron fuel filter that has the 7/8" stud opening. The best I've found is a Donaldson rated at 5 micron. I may see if the folks at Cummins El Paso will replace my secondary filter head with the head with 1" stud which gives me a lot of filter options.