Need help please, we are at our wits end! Truck was running ruff at start up, since it has just under 400k miles figured it was time for some much need love. Took it in and number two injector was stuck wide open, 4 and 7 also fail the contribution test. Ordered a new set of injectors from Fernando 1.5 over stock, with a hydra. Install everything and still getting fuel in oil. Once truck hits operating temp it will start loosing power. Check the oil and it has extra half gallon of oil. Replaced cups twice, replaced orings on injectors 3 times. Did a compression test. You name me and my mechanic have done it I think. Seriously need solid help!

 

Oil pressure runs higher than fuel pressure in the injector system so it's usually an oil in fuel issue. Offhand, I can't think of anywhere that they come together where the fuel pressure is higher than oil pressure.

 

Is there, possibly, a plug on the fuel rail somewhere under the valve covers that is for draining the fuel rail? If it's leaking or something into the crankcase?

 

The fuel runs thru the cylinder head not a fuel rail

 

If you are certain it is fuel in oil, and with 400k and no success with repairs with what you have done. It is time to put a remanned or good used engine in.

 

Did you get this resolved? I’ve just looked through about 500 threads in the search and this is the only one I came up with. Hoping you figured something out.