#7 Fuel injector spraying out under cap onto valve cover

[BillBallard]

I just replaced the valve cover gaskets on my 91 7.3idi. While cranking the engine and bleeding air out of the fuel line, I noticed atomized fuel spraying out under the injector cap on the #7 cylinder. The caps, O rings, and return lines were recently replaced. There were no cracks in the cap, and the return lines were fine. So I replaced the O rings, and it continued to spray. That’s where things stand at the moment.

I’m thinking a bad injector. I would greatly appreciate some guidance on this.

Thank you

 

[Nero]

Swap injectors with another cylinder, if the problem follows, bobs ya uncle.

 

[franklin2]

The return system with the caps and o-rings are very low pressure. I would not think a leak there would spray. But the fuel coming out of the tip of the injector is another story, it's at 1800 psi. I would suspect the hard line connection on top of the injector. They are easy to cross thread.

 

[Clb]

+1 on swapping out the #7 somewhere else, but these returns will leak if you look at them wrong.
+1 on the low pressure of the returns...

 

[BillBallard]

It turned out I cross threaded the hard line connector. After backing it off, and carefully rethreading, there were no leaks. Thank you!