Fuel In Oil

[boordom64]

have a 1999 mack e7-400 just changed fuel pump injector pump and injector now it seems to be leaking fuel into the oil any help would be appricated thanks

[rhasler]

Sounds like you cut the lower o-ring on the EUP when you installed it or maybe a worn EUP bore in the block. There is an improved o-ring kit that you can use. If the rest of the EUPs are old it could be that the fuel is coming from around the plungers on them too.

[boordom64]

thanks any way to check

[rhasler]

Drain the oil, drop the pan, remove the fuel inlet line to the cylinder block, remove the fuel system check valve from the block and plug the block off with a 16mm x 1.5 o-ring seal plug, attach pressure vessel with UV dyed fuel and pressurize the fuel gallery and look for leaks coming around the cam lobes for the injectors and/or running down the block from the area of the camshaft.

[fjh]

Drain the oil, drop the pan, remove the fuel inlet line to the cylinder block, remove the fuel system check valve from the block and plug the block off with a 16mm x 1.5 o-ring seal plug, attach pressure vessel with UV dyed fuel and pressurize the fuel gallery and look for leaks coming around the cam lobes for the injectors and/or running down the block from the area of the camshaft.

Another possible place is Injectors as I beleive that year of engine still has a spill off lin in the head ,the fuel transfer pump seal is also a possible place Eups is the top of the three suspects.