Bedienungsanleitung Mastercraft X14v (Seite 221 von 285) (Englisch)

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Fuel System Treatment

This preparation needs to be done prior

to removing water from the engine, if that

will be part of the process.

 Boatsthataregoingtobestoredforex-

tended periods (more than two [2] weeks)

or winterized should have attention for the

fuelsystem.EvenTOPTIERgasolineswill

experience some separation of elements

and settling during these periods. Of con-

siderable concern is that water condensa-

tionwilloccurwithinthefuelsystem,and

water is an enemy of good-starting and

running engine fuel systems. Therefore,

follow this procedure:

• Thefueltankshouldbeninety-to-nine-

ty-ve percent (90-95%) full of TOP

TIERgasoline.Thisallowsforminimal

room in which air can oxygenate the

fuelduringdiurnalcycles(dailyperiods

of expansion/contraction of gasoline

vapors and air as a result of temperature

changes).However,MasterCraftboats

haveEPA-dictatedfuelsystems,which

means they cannot be overlled. The

boats are equipped with ullage (over-

ow) tanks. Equipped with several

valestopreventoverow,eveninhigh

heat conditions with 100 percent full

fuel, our expansion tanks will expand

byseven-to-ninepercent(7-9%),asop-

posedtothevepercent(5%)required

bytheEPA.Astemperaturesriseinthe

tank, the pressure also rises, pushing

out gasoline vapor-and-air mixtures.

When the temperature falls, pressure

lowersandthesystemwillseektodraw

fresh air and water vapor (depending on

thehumiditylevel)intothetank.Fresh

air is replaced with “light ends,” which

are low-boiling components that vapor-

izeatambienttemperatures.Lightends

are required during cold starts to va-

porizethefuel.Sincethedailydiurnal

cycles eliminate the light ends, a full

tank helps to minimize the air volume

enteringthesystem.

• Addabiocideadditiveinthefueltank

to limit microbial growth in gasoline.

Followthedirectionsprovidedby the

additive’s manufacturer.

• Addafuelstabilizer,suchasSta-Bil

preferablytheMarinegradeorEthanol

grade stabilizer, to the fuel tank. Fol-

lowthedirectionsprovidedbythesta-

bilizer’s manufacturer.

• Runtheengineforatleastfteen(15)

minuteswhileinabodyofwater.This

allows for the circulation of the addi-

tivesthroughoutthefuelsystem.

• Duringstorage, the tankvents can be

sealed. If the vent is sealed, the tank

must NOT be completely lled. A

ninety-to-ninety-vepercent(90-95%)

lledtankallowsroomforexpansion,

which will be required at certain times

when temperatures increase. In ad-

dition to preventing water intrusion,

sealing can preventing “gumming.”

The hydrocarbons in gasoline react

with naturally occurring oxygen and

createa by-product known as “gum.”

The substance, as the name infers,

plugsupfuelltersandinjectors.Seal-

ingthetankhelpsreducegummingby

signicantlylimitingtheamountofox-

ygenavailableforinteractionwiththe

hydrocarbons.Ifthetankventissealed

for storage/winterization, it is impera-

tive to ensure that the vent is unsealed

prior to the boat being placed back into

service! Failure to do so will result in

issues in trying to ll the gas tank in

futurell-ups.

Page 6-28 2014 MasterCraft Owners Manual • Care and Maintenance

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