Toro Sand Pro 3040 - Page 64

EvaporativeControlSystem(continued)
vacuumunseatsthecheckvalvewhichthenallowsvaporsfromthecanisterto
owtotheenginepurgeport.Thesevaporsarethenconsumedbytheengine.
Whentheengineisnotrunning,evaporativevaporsremaininthefueltankand
carboncanister.
Note:Ifthereisrestrictioninthecarboncanister,therollovervalveorthevent
hose,thefueltankmaydistortduetoventingissues.Ifthefueltankreturnsto
it’snormalshapewhenthefuelcapisremoved,restrictionintheevaporative
controlsystemislikely.
RefertoFigure13forthisprocedure.
1.Inspectthecarboncanisterandattachedhosesfordamageorleaks.A
damagedorleakingcanistershouldbereplaced.
2.Ensurethefreshairlterbehindthecarboncanisterisnotblocked.
3.Ensureallevaporativecontrolsystemhosesarenotkinkedorpinchedand
aresecuredateachendwithhoseclamps.
4.Testtheoperationofthecheckvalve.Thevalveshouldopen(allowow
throughthevalve)whenapproximately100mmAq(0.29inchHg)vacuum
isappliedtoportA.Thereshouldbenoowthroughthevalvewhenthe
sameamountofvacuumisappliedtoportB.
5.Repairorreplaceevaporativesystemcomponentsasnecessary.Ensurethe
arrowonthecheckvalveispointedtowardtheenginepurgeportduring
installation.
Engine:ServiceandRepairs
Page4–14
SandPro
®
3040and5040
20251SLRevA