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Old 07-01-2012, 04:27 PM   #1
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Current diesel fuel and older DP?

We've been told that older (pre-2006 diesels) don't do well on current diesel fuel due to changes made in the fuel.
Has anyone heard anything about this?
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Old 07-01-2012, 04:38 PM   #2
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Some diesels had problems with seals leaking in the lift pump if I remember correctly. Visible as leakage on the side of the engine. Haven't heard anyone complain about it lately so maybe everyone got their seals changed?
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Old 07-01-2012, 04:45 PM   #3
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Who told you that? Next door neighbor or knowledgeable trained mechanic? I have an 05 with ISL400 Cummins and no problems at all with fuel.
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Old 07-01-2012, 06:57 PM   #4
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My 1995 has had no problems since 2005. I did lose the fuel injection pump at that time.
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Old 07-01-2012, 07:03 PM   #5
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My 97 ISB is doing fine. No leaks and about 10 mpg.
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Old 07-01-2012, 07:03 PM   #6
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Since 06 on road diesel is ULSD (Ultra low sulfer) approved for use in all year models. USLD has lower lubricity when refined but addives for lubricity is added back in. I use a diesel fuel treatment in addition,,,just my personal choice.
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Old 07-01-2012, 07:07 PM   #7
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A summation of the Cummins lift pump seal bulletin is available HERE.

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Old 07-01-2012, 07:39 PM   #8
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Yes and old wives tell many other tales too. It is a thing of the past. Forget about it and find something else to worry about.
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Old 07-01-2012, 08:16 PM   #9
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My '03 Cummins has had zero problem with ULSD. there have been reports that it tends to dissolve old deposits in the fuel tank and clog the fuel filter more often. The fix is to be sure to carry a couple of fuel filters with you just in case. Many people have reported the same as me, no problem whatsoever.
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Old 07-01-2012, 08:20 PM   #10
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Quote:
Originally Posted by Steve Ownby View Post
My '03 Cummins has had zero problem with ULSD. there have been reports that it tends to dissolve old deposits in the fuel tank and clog the fuel filter more often. The fix is to be sure to carry a couple of fuel filters with you just in case. Many people have reported the same as me, no problem whatsoever.
Same with our '02 ISC. ZERO problems.
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Old 07-01-2012, 08:33 PM   #11
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Quote:
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A summation of the Cummins lift pump seal bulletin is available HERE.

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Which states (for those with heads buried too deep in the sand to actually LOOK at the bulletin):

Quote:
Cummins Lift Pump Leakage Due to Ultra Low Sulfur Diesel Fuel

This information affects Cummins ISB and QSB CM550, ISC, QSC, ISL, and QSL CM554 engines

Cummins has issued a caution regarding a potential lift pump fuel leak if a customer switches to Ultra Low Sulfur Diesel (ULSD) fuel after using Low Sulfur Diesel (LSD) fuel. This information affects Cummins ISB and QSB CM550, ISC, QSC, ISL, and QSL CM554 engines.

The manufacturer of these engines says that due to fuel changes from LSD to ULSD, the lift pump can leak between the bracket and the lift pump body or at the electrical connector. If a fuel leak appears on the lift pump, determine if the customer has begun to use ULSD fuel recently.

NOW, perhaps only a FEW diesel owners are affected - but SOME are, or will be - so isn't it better to at least be informed of the very real possibility, rather than pretend it doesn't really exist?
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Old 07-01-2012, 09:11 PM   #12
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I have an 03 TS, 400 hp cummins and yes I had a diesel leak - lift pump. They said it was because of the new diesel
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Old 07-01-2012, 09:17 PM   #13
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Quote:
Originally Posted by bfrances View Post
We've been told that older (pre-2006 diesels) don't do well on current diesel fuel due to changes made in the fuel.
Has anyone heard anything about this?
Our '95 C8.3 Cummins @ 145,000 miles is doing just fine on the new fuel.
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Old 07-08-2012, 01:42 PM   #14
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Many diesels use the fuel for lubrication of the injectors and the injector pump(s). That is what the sulfer in the fuel did. If however you had a Cummins, it did not matter, because Cummins developed their engines with engine oil lube for the injector pump. Also it wasn't until the last few years that diesel engine manufacturers gave the OK to use biodiesel fuels.
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