diesel fuel , dirty filter question.

[luckyman]

Here's some pictures.

[timberghost72]

Ill look into to that. It makes sense. Wouldn't it turn the fuel dark? Fuels is very bright green, just the filter turning black.

No. Keep in mind it is not alot of oil getting by the orings and your fuel system is constantly flowing while running. Over time the filter turns black. It doesn't take alot if oil to turn a white filter black. If your fuel was dark then you'd run out of oil or your engine would die from low oil/oil pressure. Your injectors are fired from very high oil pressure. Low oil = poor or no fuel injection.

[huntnphool]

Oil can’t get into the fuel bowl via leaky injector seals though. Whatever is in your bowl is coming from the tank or pieces on/in the bowl itself.

[luckyman]

Ok I filtered my diesel sample from the bowl to get a look at the brown stuff. It looks to me to be sludge. It ground up between my finger with no effort to where it disappeared. It does contain aluminum slivers so must be injector ware.

[jackelope]

Some of those 7.3 trucks had fuel tank delamination issues.
 

[huntnphool]

Ok I filtered my diesel sample from the bowl to get a look at the brown stuff. It looks to me to be sludge. It ground up between my finger with no effort to where it disappeared. It does contain aluminum slivers so must be injector ware.

 Fuel is pressurized and flows from the bowl to the injectors, how does it flow from the injectors, back to the bowl?

[luckyman]

I don't know but if it has aluminum in  it, it comes from somewhere. primary pump? From the bowl it's pumped back to the tank where the screen was packed full off this stuff previously. Its been like this for over 100,000 miles that I'm aware of.
 Ill add it starts and run very well. I would like to pin point the issue.

[timberghost72]

Ok I filtered my diesel sample from the bowl to get a look at the brown stuff. It looks to me to be sludge. It ground up between my finger with no effort to where it disappeared. It does contain aluminum slivers so must be injector ware.

 Fuel is pressurized and flows from the bowl to the injectors, how does it flow from the injectors, back to the bowl?

From the fuel return.
The lower injector O-rings separate the fuel from the high pressure oil system in your heads. High pressure oil system fires your injectors and that pressure is a lot higher than your fuel pressure. If the oil is leaking past the O-rings it gets into your diesel fuel and into the bowl from your fuel return.

[luckyman]

Some of those 7.3 trucks had fuel tank delamination issues.
 

Can you explain that a little further?

[timberghost72]

The silver stuff in your fuel bowl can be from your fuel heater disolving. You have a few issues going on and all of these are very common.

[luckyman]

Yeah, heater was loose.

[jackelope]

Some of those 7.3 trucks had fuel tank delamination issues.
 

Can you explain that a little further?

The liner of the tank degrades and ends up in the fuel filter. Glob-ish gelatin looking crud. No metal though. Just goo.

[luckyman]

Some of those 7.3 trucks had fuel tank delamination issues.
 

Can you explain that a little further?

The liner of the tank degrades and ends up in the fuel filter. Glob-ish gelatin looking crud. No metal though. Just goo.

Thanks.
The tank is black plastic, not metal like earlier models.

[luckyman]

will Replacing injector orings be worth the trouble? It runs really well now. Besides keeping sludge build up out of tank and filter is there any thing else to gain or prevent.

[Special T]

You should call northland diesel services in Bellingham. I bet you could get them cleaned, tested and o rings for them there.

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