EVAP service port

Asked by Jul 10, 2016 at 03:10 PM

Question type: Maintenance & Repair

I am working on a 2008 Silverado with 5.3 V8. I am trying
to perform a smoke test I the EVAP system but cannot
locate the test port. I feel stupid for asking but does
anyone know where it is located? I've been looking for an
hour now with no results

6 Answers


In engine compartment, on drivers side just back of the power distribution box. Looks like an A/C port.

Are you referring to the fuse box panel?


No that is inside the passenger compartment, this is the power distribution box in the engine compartment, it's black and just about 1 foot square, then just about a foot towards the firewall is the port.

I was actually referring to the same block as you just stated. There is only about 8 inches from that to the firewall and there is no test port in that location


That's weird, that is where mine is.

This is very frustrating but thanks for the help

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