Honda Civic Service Manual page 394

FuelTank Vapor Control Valve Test
Special Tools Required
Vacuum Pump/Gauge, 0-30 in. Hg A973X-041-XXXXX
Float Test
1 . M a k e s u r e t h e f u e l t a n k i s l e s s t h a n h a l f f u l l .
2. Remove the fuel fill cap to relieve fuel tank
pressure, then reinstall the cap.
3. Disconnect the fuel tank vapor recirculation tube
{ A ) , a n d c o n n e c t a v a c u u m P u m P t o i t .
P l u g t h e l i n e ( B ) .
Apply vacuum to the fuel tank vapor recirculation
t u D e .
lf the vacuum holds, replace the fuel tank vapor
c o n t r o l v a l v e ( s e e p a g e 1 1 - 1 8 9 ) .
lf the vacuum does not hold, the float is OK. Do
the valve test.
5 .
A973X-041-XXXXX
Valve Test
1 . N 4 a k e s u r e t h e f u e l t a n k i s l e s s t h a n h a l f f u l l
2 . R e m o v e t h e f u e l f i l l c a p .
3. Disconnect the fuel tank vapor signal tube (A).
Disconnect the vacuum hoses (A) from the EVAP
canister (B), then plug the ports with plugs (C)
4 .
A973X-O41-XXXXX
5. Disconnect the vacuum hose (D) from the EVAP
canister vent shut valve (E), and connect a vacuum
pump to the vacuum hose.
6 . P u m p t h e v a c u u m p u m p 8 0 t i m e s .
. l f t h e v a c u u m h o l d s , g o t o s t e P 7 .
. l f t h e v a c u u m d o e s n o 1 h o l d , g o t o s t e p 1 0 .
(cont'd)
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