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Old 07-17-2019, 05:20 PM   #11
Aqua Puttana
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Default Re: Injector lifespan?

There's no reason to think that the micron rating goes high as the filter service time increases. If anything it may improve. In my limited experience a 30 - 40k mile T1N fuel filter change intervals provide reliable service. Even MB has increased the fuel filter miles interval on newer Sprinter models.

I carry a spare fuel filter and the tools to change it. A bad load of fuel can quickly load up even a brand new filter.

vic
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Old 07-17-2019, 05:20 PM   #12
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Default Re: Injector lifespan?

Quote:
Originally Posted by vanski View Post
I’d call up a shop such as Linden Engineering who has thousands, not a handful, of data points helping to create their view/opinion on the subject.

Having said that, my handful of data points (i’d say around 50 swapped injectors), point to to an average injector’s lifespan of efficient operation similar to what MWD outlined. Will there be outliers in both sides of the distribution, of course...

1 instance in swapping out all of my personal rig’s injectors with certified Bosch shop remans resulted in an over night increase in fuel economy of 12%. But is a 12% increase in fuel economy worth the ~$1,750 plus labor and potential risk of screwing up the job, perhaps the head???

I’ve had great success and seen dramatic improvements in smooth running and fuel economy by disconnecting the fuel tank, putting in an inline fuel pump to compensate for the in-tank lift pump (om647), and then running a couple cans of straight liquimolly diesel purge from a jug...
Fabulous.
Can you tell me what I need for the pump mod?
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Old 07-17-2019, 07:49 PM   #13
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Default Re: Injector lifespan?

Thanks for all the input. If I were to pop for replacement injectors my choice would be brand new oem parts, makes no sense to take the chance with rebuilt ones in my mind. As great as my van has been running, I think I will leave well enough alone for now, except for changing all the sealing washers, which my van needs done, but that is another story. yes, I read all 24 pages of that thread!! First one I tried is not budging...
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Old 07-17-2019, 09:07 PM   #14
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Default Re: Injector lifespan?

Quote:
Originally Posted by skwoodwiva View Post
Fabulous.
Can you tell me what I need for the pump mod?
I picked up a 60 psi fuel pump from Summit Racing...

You need a bunch of fuel hose, I want to say 1/2" diameter, but do that research. i believe you need two different diameters..

A bunch of hose clamps.

OF COURSE MAKE SURE YOU'RE PUSHING THE LDP THROUGH THE FUEL FILTER PRIOR TO THE FUEL INJECTION SYSTEM. i know this goes without saying, but for anyone trying this i want to make sure..

also, you're disconnecting the return line and putting it back into the jug..

Last edited by vanski; 07-17-2019 at 09:10 PM.
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Old 07-17-2019, 09:13 PM   #15
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Default Re: Injector lifespan?

Quote:
Originally Posted by vanski View Post
I picked up a 60 psi fuel pump from Summit Racing...

You need a bunch of fuel hose, I want to say 1/2" diameter, but do that research. i believe you need two different diameters..

A bunch of hose clamps.

OF COURSE MAKE SURE YOU'RE PUSHING THE LDP THROUGH THE FUEL FILTER PRIOR TO THE FUEL INJECTION SYSTEM. i know this goes without saying, but for anyone trying this i want to make sure..

also, you're disconnecting the return line and putting it back into the jug..
This is a great idea, did you get a pump specifically for diesel, or are the gas ones OK to use for this short application?
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Old 07-17-2019, 09:17 PM   #16
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Default Re: Injector lifespan?

They are.
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Old 07-17-2019, 09:18 PM   #17
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Default Re: Injector lifespan?

my thought was diesel has more lubricity than gas, so any gas pump would work fine... perhaps not? so far so good.. the PSI is what's important for the correct compensation.
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Old 07-21-2019, 11:09 AM   #18
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Default Re: Injector lifespan?

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Originally Posted by Midwestdrifter View Post
As mentioned, black death injector is head seal leakage. It doesn't harm the injector, though sometimes the sealing face needs recut, and the injector can be damaged during removal.
.
In my opinion and no disrespect meant as it is a laymans view.
Injector overfuelling may contribute heavily to black death seal leakage
the excess fuel could easily be causing higher pressure within the chamber than was designed by MB. I dont know the compression numbers air vs diesel but I would GUESS diesel is harder to compress and therfre add stress to the hold down fastners

would be interested to see some numbers if anyone is inclined.

It seems a lot of people get overfueling injecter one and also seems to crop up as the first sign of black death.

of course thats all anecdotal and uninformed hearsay
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Old 07-21-2019, 02:57 PM   #19
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Default Re: Injector lifespan?

Quote:
Originally Posted by grumpy-old-van View Post
In my opinion and no disrespect meant as it is a laymans view.
Injector overfuelling may contribute heavily to black death seal leakage
the excess fuel could easily be causing higher pressure within the chamber than was designed by MB. I dont know the compression numbers air vs diesel but I would GUESS diesel is harder to compress and therfre add stress to the hold down fastners

would be interested to see some numbers if anyone is inclined.

It seems a lot of people get overfueling injecter one and also seems to crop up as the first sign of black death.

of course thats all anecdotal and uninformed hearsay
Grumps
A counterpoint to the above is that many, many times an injector position with Black Death seal leakage is repaired by properly replacing the seal and re-installing the removed injector. The injector and repaired position perform properly from that point on.

vic
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Old 07-21-2019, 03:05 PM   #20
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Default Re: Injector lifespan?

I have my doubts. Given that seal failures are less common in arid environments, and that they tend to occur on the 1st cylinder. I believe the evidence supports a corrosion based primary failure cause. Any over-fueling significant enough to cause seal failure is also likely to damage pistons/heads.

In my case the failure was around 140k miles, on injector #1. No other symptoms except exhaust smell at low speeds and high loads.
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