Mainship 40 Trawler Single - Fuel Tank Components; Fuel Valves

DANGER
! !
L
eakin
g
fuel is a fire and explosion hazard.
P
ersona
l
i
n
j
ur
y
or
d
eat
h
cou
ld
occur
.
5.2 Fuel Tank Com
p
onents
5.2.1 Fuel Tank Fills & Vents
The fuel tanks are filled throu
g
h its respective fuel fill fit-
tin
g
and the cap is marked DIESEL.
The fuel tanks fill fittin
g
s are located on each side of the
g
unwale amidships. The fuel tanks also have a hull vent
f
ittin
g
s. These
f
ittin
g
s are located on the port and star-
boa
r
d
h
u
ll
s
i
des
.
The
f
uel
f
ill and
f
uel vent hoses,
f
ittin
g
s, and connec-
tions should be inspected for leaks and si
g
ns of dr
y
rot
or swellin
g
at least once a
y
ear. If an
y
of these condi-
tions are present, have an authorized service technician
inspect the fuel s
y
stem immediatel
y
. If a leak is found,
turn off batter
y
switches, disconnect shore power, and
disable an
y
possible source o
f
i
g
nition.
C
ontact
y
our
dealer or Customer Service immediatel
y
.
DANGER
! !
T
he use of an
y
hose other than the USCG T
y
pe A1
o
r A2 could result in fuel leaka
g
e. Leakin
g
fuel is a
f
ire and explosion hazard. Personal in
j
ur
y
or death
c
ou
ld
resu
l
t
.
5.2.2 Fuel Suppl
y
Lines and Hoses
If
an
y
f
uel
f
ill or vent hose's are in need o
f
replacement,
e
nsure that onl
y
U
SCG
T
y
pe A1 or A2 are used. Each
e
n
g
ine has a fuel suppl
y
hose that runs from the pickup
tube in the
f
uel tank to the
f
uel water separator
(
com-
m
onl
y
re
f
erred to as the
f
uel
f
ilter
)
, then
f
rom the
f
ilter to
the en
g
ine. Also, each en
g
ine has a fuel return hose that
runs
f
rom the en
g
ine back to the
f
uel tank. I
f
y
our boat
h
as a
g
enerator, the
g
enerator will have somewhat the
s
ame setup, with the suppl
y
and return hose. The fuel
s
uppl
y
lines or hoses,
f
ittin
g
, and connections should be
inspected o
f
ten
f
or leaks and si
g
ns o
f
wear, dr
y
rot, cha
f
-
in
g
, or swellin
g
. A
g
ood wa
y
to inspect the fuel hoses is
to run
y
our hand alon
g
the len
g
th o
f
the hose includin
g
the
f
ittin
g
s. Leaks will be revealed as wet spots on
y
our
h
and. If an
y
evidence of hose deterioration is present,
h
ave a quali
f
ied technician replace all the hoses with
U
SCG T
y
pe A1 hoses immediatel
y
!
Note: If a leak is found, turn off battery switches, disconnect
shore power, and disable any source of ignition. Do not start
your engines, the generator, or any devices that could cre-
ate a spark. Contact your dealer or our Customer Service
Department immediately! If hoses need to be replaced, make
sure only USCG Type A1 are used.
5.2.3 Generator Fuel Suppl
y
Notic
e
I
n fi
g
ure 5.2 we demonstrate the la
y
out of
y
our boat's
f
uel pick up lines on the port side
f
uel tank.
S
ee the
M
echanical Arran
g
ement Drawin
g
in the Boatin
g
S
a
f
et
y
c
ha
p
ter of this manual for more location information.
The pickup inside the tank
f
or the
g
enerator is hi
g
her
than the en
g
ine pickup.
Fi
g
ure 5.
2
5.3 Fuel Valve
s
Y
ou
r
boa
t h
as
f
ue
l
s
h
u
t
o
ff v
a
lv
es
l
oca
t
ed
a
t th
e
t
a
nk in
the suppl
y
line route. These valves are used to start or
s
top the
f
low o
f
f
uel throu
g
h the suppl
y
lines.
Note: Even if the fuel supply valves are closed, there may be
fuel in the supply lines to the filters and engines (or genera-
tor). Disconnecting these fittings without properly bleeding
the system of fuel could result in emptying the fuel filters and
causing a fuel spill. Only a qualified technician should ever
make repairs to your fuel system.
The
f
uel suppl
y
valves are the
“
ball t
y
pe” valves.
T
urn
i
n
g
t
h
e
h
an
dl
e so
i
t
i
s perpen
di
cu
l
ar to t
h
e va
l
ve
bod
y
shuts o
ff
the suppl
y
or return. Turnin
g
the handle
s
o it is in line with the valve bod
y
opens the valve, as
s
hown in Fi
g
ure 5.3.
M
ainship 40 Trawler Sin
g
le & Twin • Fuel S
y
stem
5
.4