A fuel leak has sprung in the valley underneath the intake manifold on my 85 6.2...

[Nycxjeremyy]

As the title states, a fuel leak has sprung down there, we already tore off the intake, turbo housing, however we couldn't find exactly where its coming from, I have a video of said leak, but its really hard to pinpoint, I hope its just a line, and not the IP itself.

Any second opinions would really help, i did replace the rubber lines when I was in there, did not touch the metal lines though

Attached are the videos of how it looked like/how it ran without the manifold, photos will be attached on this post aswell
https://photos.app.goo.gl/N3HHPGKi3TeCws6w9

Thank you again.
(Also, I have some oil coming from the intake, bit uneasy about it)

- 1985 6.2 Detroit Diesel Motor w/h ATS Turbo Kit

[Robyn]

Throttle shaft leaks are common on these....
If you can get get a good look at the area right below the shaft you may find the gremlin.

[DmaxMaverick]

Yes, the throttle shaft is a common suspect. If the IP or any line connections are leaking, they will be wet with fuel long before you'll notice any collection in the valley. Return lines are also suspect.

Some oil in the intake is normal. The CDR (Crankcase Depression Regulator, the tuna can next to the oil fill pipe on your 85) allows some oil vapor into the intake. This does not mean it's bad. Some oils vaporize more than others, and more blowby (older, high mileage engine) is more crankcase pressure that passes into the intake, ahead of the turbo compressor, which may also have a coating of oil. The CDR's ONLY purpose is to prevent excessive crankcase vacuum (depression) at higher RPM's and other conditions, such as a fouled air filter or air inlet. Combine this with the EGR (if it's still working), will result in a gooey mess in the intake tract, but it's essentially benign, even after many years and miles.