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You got critters! And because they are brown they are still young and alive!
Ideally you should remove the fuel tank and thoroughly clean it, replace all of the fuel hoses including the return lines, and clean the lift pump and fuel tank strainers. Replace the secondary fuel filter (the one in your picture). Make sure when you refuel that it is from a known reliable and clean source, and subsequently dose the next three fuelings.
There are many fuel treatments on the market. Make sure the one you select contains a biocide. I personally use Hammond's Biobor JF.
Note: The Cyanobacteria (bugs) are highly corrosive and can do major damage to fuel system components which won't be realized for some time so it's very important to keep your fuel clean and dry (no water).
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Well, compressor oil is not the same as engine oil regardless of the similarities in viscosity, but I'm not going to debate that here.
There is no way your pump can make compressor oil. Plain and simple, you have a badly leaking barrel and plunger assembly. If you were to analyze your injector pump oil you would find it highly diluted with diesel fuel. So we are back to square one. One test you can perform to confirm this overnight leakage is to shut off the fuel valve at the tank and see if it happens again.
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Even though I dislike the Robertsons, I have the LINE-X on my bed. It is tough as nails. I have slid thousand pound pallets on it and no damage, just scratches.
It is not DIY.
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Didn't mean to shout, should have underlined for emphasis.
The “rubber ring” has me curious. Do the other lines have it?
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Not sure what happened to my post, but I asked if the other lines had that “rubber ring” also.
What you have there in your pic is the check valve assembly that goes between the barrel and the injector line. Not all injection pump assemblies are made this way. What yours would require in that application (if it is an O-ring, it should be captured) is either a copper or aluminum washer that can be crushed. Check and see what the other lines have.
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THERE IS NO O-RING TO REPLACE!
Doubtful you will find thread sealant for 2,000+ psi.
Might try a copper or aluminum washer at #44.
I still think your problem may be the fuel line.
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Here is a cutaway view of a barrel and plunger assembly so you can see what your problem is.More than likely you will have to replace the whole injection pump/governor assembly, or take it to a diesel shop.
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