I recently rebuilt my engine and it looks like only one OMP line is working. One OMP line has a slightly tint like it is carrying oil, but the other line looks completely clear.

I'm wondering what the issue could be here? I don't suspect that the OMP itself is bad because it is pumping oil into one line. I just replaced both lines and all the washers with new OEM stuff during the rebuild. Would a bad vacuum line or check value cause a line to not carry any oil? I've probably put 25 miles on the engine after the rebuild and there may be a very light bit of oil in the intake (tough to tell).

If anyone has any experience troubleshooting these issues and has a recommendation that would be great!

 

crack the oil injectors to see if there is fluid in the lines.

Did you replace the oil injectors when you did the rebuild? Those can get clogged really easily!

Did you put any premix in the fuel before you did your initial startup?

If you look at the vacuum diagram then a vacuum leak would probably cause something to go awry, since they are connected to a vacuum/boost source. I am not positive in that though.

 

Hopefully in the next few days I'll have time to get access to the oil injectors (they are really buried, so I have to take a bunch of crap off the engine), and I'll crack the injectors to see if there is anything in the lines.

I didn't replace the oil injectors during the rebuild - I guess that was a mistake, haha. Once the oil injectors are off is there an easy way to check if they are clogged?

Also, I didn't premix before the initial start-up. The engine did have a good amount of engine assembly lube in it after assembly though.

I think that the vacuum lines are routed correctly, but potentially the vacuum line to the rear oil injector is leaking/cracked. I did replace all of the vacuum lines during the rebuild.

 

I just ordered two new injectors. It was about $120 from Ray Crowe.

Seems like cheap insurance