Know your Supply Tubes

[BrianAtSmarty]

Know your supply tubes



Internally contained in the Supply tube is the Edge Filter. The Edge Filter is a safety feature, built into the supply tube. It is designed to break particles larger than 50 µm into smaller pieces to avoid major malfunctions like continuous injection, blocked nozzle holes, amongst other things that can cause catastrophic engine failure. Contamination smaller than 50 µm will still cause damage to your injectors and reduce their lifetime. Careful inspection of the edge filters will tell you about your fuel quality and filtration system.

If your supply tubes look like new:

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Indicates the good quality of fuel that you use, with a proper fuel filter and proper filter interval changes.






If you have slight wear traces on it:

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This tells you that you get a lot of particles in your injectors and you should change your fuel filter more often.





Flow channels built on the edge filter:

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You have serious problems with your fuel quality. You should change the location where you buy your fuel. Often times the dirt gets into the fuel at the petrol station, by having leakage allowing dust into their fuel tanks. Or you do not use the correct filter for your application or change your fuel filter often enough.

Many people think that an older fuel filter will filter more than a new one, because the orifices on the filter material are getting closed or smaller, but that is simply wrong. An older filter will reduce the flow through it, which causes a bigger pressure resistance of the filter and a bigger delta pressure between the inlet and the outlet of the filter. This leads to the fact that bigger particles are getting pressed through the filter material and the effectiveness of filter is getting lower and lower and the number of particles getting to your injectors is increased.

In order to inspect your edge filter, it must be pressed out of the inlet end. Once removed, both the supply tube & edge filter are NOT reuseable !

 

[Mobius1]

Great info as always Brian! Is it true that the 6.7 and 5.9 are NOT interchangeable? Cummins has super ceded the 5.9 tubes to the 6.7 tubes however they are definitely different. The openings are a lot bigger on the 6.7. I just bought BBI stg 1.5 for my 05 and was given the 6.7 tubes for the install. After reading some info on here and other sites, some say it will work fine others say there could be problems. Just want to get another opinion.

Thanks!

 

[BrianAtSmarty]

Hi Dean,

you will be fine with the 6.7 tubes. That is the style supplied now days and the ones we send out.

Thank you!

Brian

 

[seafish]

Mobius1, I just asked that same question on the same thread that Brian started on CF...he answered that in fact BBI supplies 6.7 connector tubes with the 5.9 injectors.

I am somewhat concerned because there HAVE been some reports, including from reputable Diesel techs, that the flange seal on the 6.7 tube IS slightly differnt from the flange angle on the 5.9 injector, and may cause leakage problems even with a careful installation and following proper torque numbers and sequences.

I DO plan on getting the BBI ionjectors when I need to replace mine, but I would like BBI to clarify this issue since they DO seem to have access to high quality measurement AND photographic equipment. I will try to post a link to a couple of the threads that detail this issue.

 

[seafish]

Here is the link I am referring...given the knowledge of some of the contributors, I cannot believe that they are simply making this stuff up, even though I thought that the 6.7 tubes were a Cummins superceded part #, and thus an upgraded component...

http://www.cumminsforum.com/forum/3...-you-do-injectors-use-correct-feed-tubes.html

Brian can you please look into this and clarify??

 

[Mobius1]

Is there any advantage to the 6.7 tubes over the 5.9? I used the 5.9 tubes with the BBI 's stg 1.5

 

[seafish]

Is there any advantage to the 6.7 tubes over the 5.9? I used the 5.9 tubes with the BBI 's stg 1.5

That's probably a good thing...they 6.7 tubes ARE a larger diameter and can flow more fuel if you are trying to get more HP, but if you read the thread that I linked to, there might well be sealing problems when using the 6.7 tubes with 5.9 injectors, due perhaps to a slight difference in the angle/taper of the actual connection seat...THAT is EXACTLYwhat I am hoping that Brian, can clarify at some point!!

 

[BrianAtSmarty]

Thank you Gentlemen!

Here is the scoop as I know it. The newer tubes are designed to replace both the 5.9 tubes and the earlier 6.7 tubes. There is only one part # available now. That is, unless somebody has some old stock available. Also there are some Chinese copies out there that I will recommend one to stay far away from.

Early 6.7 tubes will NOT work in the 5.9 injectors and vice versa. The “new” tubes work in both. So there was, at times, 3 different part #’s in addition to the Chinese copies. Grab the new part # and you are good to go.

 

[cerberusiam]

There is only one part # available now. That is, unless somebody has some old stock available

Are you sure about that?

There is only 1 P\N available from Cummins. However, the F00RJ01572 still shows as a good P\N from Bosch, according to authorized Bosch service center.

There are literally 100's of places world-wide showing this number as in stock and valid.

 

[seafish]

Cerb, you are absolutely right in that the 5.9 connector tubes are still available from Bosch...the mystery question is:

WHY would Cummins supercede the part# if it did NOT work right??

 

[cerberusiam]

Pretty sure it is an inventory thing from Cummins perspective. They don't make the 5.9 anymore and the new tubes will generally work with the new injectors so all they stock in their system is the later tubes. From what I have seen the new tubes on an older injector is where the issues are based. if it doesn't work correctly then Cummins will sell you a new engine.