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Low Sulfur fuels

Yahoo Message Number: 30297
I asked Cummins about using the low Sulfur fuels and adding 2 cycle as an additive this was their reply Summary: 2 cycle oil

Solution:

Thanks for your Email message. You have contacted Cummins, Inc. at our Customer Assistance

Center located in Columbus, Indiana. This is our worldwide headquarters and has been our home since Clessie Cummins founded the company February 3, 1919.

There are many rumors circulating about the effects of sulfur being in diesel fuel or sulfur

being taken out of diesel fuel. Diesel fuel without sulfur is just as good, in all respects

except one, when compared with today's fuels with sulfur.

Diesel fuel, in the United States, now must meet a lubricity standard. The producers adjust the lubricity before they distribute the fuel. No further additives are needed to ensure proper
fuel system lubrication.

The only negative effect of taking sulfur out of fuel is that the fuel becomes more expensive,

somewhat negating the inherent cost advantage of running diesel engines when compared to other

fuels. It has to be removed using specialized equipment and chemical processes that add to the

expense of producing the fuel.

We have seen a very few instances where the reduced aromatic content of the fuel has resulted in

slight leaks from fuel systems. This is not expected to be an issue with many engines.

Basically the change to new fuel should be pretty easy for folks with the engines built prior to

2007 and for customers with the engines built in 2007 it will be necessary, for the short time

it takes fuel stations to consume the remainder of the old fuel (maybe a month or two), to be

certain they are not fueling with the older fuel.
There is an effect on diesel engines from the use of low or no sulfur fuel which we expect to be

positive. The blowby gasses that normally pass through the engine crankcase will contain less

or none of the chemically reactive sulfur and its compounds. This will tend to keep the engine

oil cleaner during operation and allow important engine components like bushings, bearings and
piston rings to live longer.

Diesel fuels containing sulfur or no sulfur each have the same specific heat, about 20,000 BTUs

per pound. For that reason they give the same amounts of work for the same amount of fuel.

That means the fuel economy per gallon will not be affected.

Over the years we have seen fuel economy decrease, somewhat, as diesel engine designs have been

modified to meet the lower NOX limits imposed by government. This has been totally unrelated to
sulfur in the fuel.

With lower sulfur fuels it is possible that some exhaust after treatment devices (catalytic

converters) may be used to better effect, making it possible to further decrease harmful exhaust
emissions.

If you use diesel fuel that does not meet the new federal low sulfur requirements that are going

into effect for 2007, in a 2007 vehicle that requires the new fuel, it will produce particulate

matter that will cause rapid plugging of the exhaust particulate trap. We have only just

started producing engines for such vehicles in January of 2007.
We thank you for your interest in Cummins products. We occasionally misunderstand a question.

If our answer to your communication looks like we have misunderstood your e-mail please reply
with further inquiry.

To locate the nearest Cummins-authorized Dealer or Distributor Service Provider use option #2

on our toll free customer assistance line 1-800-DIESELS (343-7357) or for computer assistance in

locating a Service Provider, use Cummins Service Locator, which can be found on Cummins website:

http://wsl.cummins.com/ServiceLocator/jsp/controller.jsp? action=showworldmap

Please let us know if you have other questions and if away from your computer or have a

time-critical request that needs more urgent attention, feel free to call us toll-free (from

North America) at option #4 on 1-800-DIESELS (343-7357).
Cummins Email (via webpage):

http://www.cummins.com/cmi/content.jsp? siteId=1&langId=1033&menuId=6&overviewId=33&menuIndex=7

Customer Assistance Center
Cummins, Inc.

Columbus, Indiana, USA

Re: Low Sulfur fuels

Reply #1 –
Yahoo Message Number: 30381
Gee, that guy just beat the hell out of that bush!!!!!!!!!!!!!!

Quote "we have seen very few intances" I guess so if you are in an office in Culumbus, Indiana.

OK, now to the nitty gritty stuff--how many of you on the forum have had to get you lift pump replaced or lucky enough to just replace the seals. I for one had mine replace first part of March and have driven over 2700 miles and got back home late yesterday and found some oil or fuel spots on the back of the coach. Now I will probably have to go back to Coach Care and see what that is all about. Really did not see it after the 2200 mile run but did notice it after the short 500 mile outing.
Egon

'99 Allure #0321

Quote from: beezer012345

Re: Low Sulfur fuels

Reply #2 –
Yahoo Message Number: 30403
Egon: Check your oil level. If it is high, you may have what I had: a failed injector pump. I had a bad lift pump, and after replacing it I took a cross country trip from California to Florida and back. On the way back, I started getting oil on the back of my coach, I also noticed my oil pressure was lower than usual. It turned out my injector pump had developed leaking seals that allowed diesel fuel to enter the crankcase. The high level of oil/fuel mix then resulted in a discharge out the crankcase vent, particularly when I engaged the exhaust brake.

BTW, I worried after I found out what had happened that I might have damaged the engine, but Cummins says as long as you don't drive thousands of miles with this condition it is not a problem. Diesel is a lubricant (but a low viscosity one).

Al Colby

2000 Intrigue 10979

Quote from: Egon Schlottmann
>

Gee, that guy just beat the hell out of that bush!!!!!!!!!!!!!! > > Quote "we have seen very few intances" I guess so if you are in an > office in Culumbus, Indiana.
> OK, now to the nitty gritty stuff--how many of you on the forum have > had to get you lift pump replaced or lucky enough to just replace

the

Quote
seals. I for one had mine replace first part of March and have

driven

Quote
over 2700 miles and got back home late yesterday and found some oil

or

Quote
fuel spots on the back of the coach. Now I will probably have to go > back to Coach Care and see what that is all about. Really did not

see

Quote
it after the 2200 mile run but did notice it after the short 500

mile

Re: Low Sulfur fuels

Reply #3 –
Yahoo Message Number: 30470
Allan,

I checked my oil level and it is right at the full mark after driving around 3,000 miles after the last oil change. Now my oil filter, I guess that what it is ( the big black canister at the right rear side of the engine) is covered with some oil and dirt. I have not really looked at it since I got back from Houston but I will check it and see that everything is tight on it. That may be the place where some oil was coming from and got on the back of the coach.

Thanks,
Egon

'99 Allure #30321

Quote from: Allan Colby

Re: Low Sulfur fuels

Reply #4 –
Yahoo Message Number: 30480
Egon,

You may be looking at the reservoir for the hydraulic fluid. Does it have a cap on the top? If it does, that is were you check the fluid for the power steering and the engine cooling fan.

Everett

99 Intrigue 10758

Re: Low Sulfur fuels

Reply #5 –
Yahoo Message Number: 30564
Thanks Everett, after post I checked a little farther and determined that it was the hydraulic fluid resevoir.
Now, I am still concerned about the post about the possibility of the injector pump failure after you have the lift pump replaced.
Has anyone had a injector pump failure? Inquiring minds want to know.

Egon

'99 Allure #30321

New lift pump as of March '07

Quote from: Everett Smith\[br\
] >

Egon,

You may be looking at the reservoir for the hydraulic fluid. Does
it have a cap on the top? If it does, that is were you check the fluid for the power steering and the engine cooling fan.