Honda Civic Service Manual page 244

Evaporative Emission (EVAPI Control Diagram
The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tanK rs
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burneo.
. The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine cootant
temperature is above 149'F (65"C).
' W h e n v a p o r p r e s s u r e i n t h e f u e l t a n k i s h i g h e r t h a n t h e s e t v a l u e o f t h e E V A P t w o w a y v a l v e , t h e v a l v e o p e n s a n
regulates the flow of fuel vapor to the EVAP canister.
' D u r i n g r e f u e l i n g , t h e f u e l t a n k v a p o r c o n t r o l v a l v e o p e n s w i t h t h e p r e s s u r e i n t h e f u e l t a n k , a n d f e e d s t h e f u e l v a D o r
to the EVAP canister.
FUEL TANK
VAPOR
RECIRCULATION
VALVE
FUEL TANK
VAPOR
SIGNAL TUBE
BLU/RED
FUEL FILL CAP
BLK
+
EVAP
CANISTER
FUEL TANK
VENT SHUT
VALVE
BLK/YEL
From
--<No. 4 Acc
{ 1 0 A } f u s e
FUEL TANK
VAPOR
RECIRCULATION
TUBE
EVAP
CANISTER
EVAP TWO WAY
VALVE
(cont'd)
11-37