TBI and EVAP question (1 Viewer)

Apr 7, 2005
Afton VA
I'm wondering how you TBI guys have your charcoal canister hooked up.

i have a couple of Alldata TBI truck manuals;

the ECM diagram shows an output for an EVAP solenoid.

However, the emissions diagram shows the TBI unit going directly to the charcoal canister and then the gas tank. Plus this seems like the typical hookup from other posts.

I know the TBI unit mechanically opens the port when the throttle is opens but it still seems like there will be too much vacuum loss w/out a purge valve.


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