I have a customers truck that has been getting fuel in the oil. 03 gmc 3500 with a newer gm motor in it. The history going back to before I got ahold of it is that they had an injector go out and the mechanic who changed the injectors used a cordless impact to put in the new injectors and return lines using the old sealing washers, return line washers and so on. Nothing and I mean absolutely nothing was torqued down to specs. It was pooring fuel into the crankcase really bad. When the truck was brought to me I tore it apart and inspected all of the injector bodies and lines. Reinstalled them with new orings, sealing washers, and return line washers. I also torqued everything down to exact specs and checked for leaks. Sent it back to the owner and had him put it on his route. The truck was still gaining oil but not nearly as bad. I pulled both valve covers and hooked enough stuff back up to run it without valve covers and inspected for leaks and couldnt find anything obvious so we replaced the oring in the cp3 put it back together and and sent it out again. Still leaking fuel! Pulled valve covers took off return lines and retorqued everything again to specs and put it all back together. Long story short its back. Now it doesnt seem like it is gaining oil like it was before redoing the return lines and washers but I have had it apart so many times that I wonder if its all in my head or if it really is slightly better. The only thing I have not replaced is the injector cups. If they were leaking wouldnt I be able to see them leak when running it with the valve covers off? Anyyy ideas???????
Ashes to ashes, dust to dust. If it werent for Fords my tools would rust!
Ashes to ashes, dust to dust. If it werent for Fords my tools would rust!
and you curse whoever touched them