How can you tell which injector o ring is bad?

[holtit]

How can you tell which injector o ring is bad? I have a 00, 7.3, 175000 miles, with oil in my fuel filter canister, burning 6 qurts in 70 miles.

[johnmere]

Just replace them all. It is not worth it if you are already there. I replaced mine tonight and had every injector out and could not tell one good one from another. I spoke with the powerstroke mechanic at the local ford dealer and he said the injector o=ring was the problem with the oil in the fuel filter.