Hi,
If you have an injector leaking, often times you will see black smoke from the exhaust indicating a rich fuel mixture.
What you can do is check fuel pressure drop off. Once the system is pressurized, see how long it takes for the pressure to drop. If there is a leak, it will drop fast.
Here is a link that explains how, in general, to test fuel pressure:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here is a link for testing injectors:
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
Let me know if this helps or if you have other questions.
Take care,
Joe
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Tuesday, October 6th, 2020 AT 2:03 PM