Results:
• Pumps fuel from hose(s), the primer pump
is
good.
• Fails to pump fuel from hose(s), make sure the
hose
is
not kinked or restricted.
• If the primer pump still does not pump fuel go to
STEP
2.
STEP 2
Remove hose at small nipple
on
top side of primer
pump.
Inspect hose for kinks or obstructions to
flow.
Operate primer pump knob. Fuel must squirt from
small nipple.
Results:
• Fails to pump fuel, inspect inlet hose between
primer pump and carburetor for kinks and
obstructions.
• If inlet hose
is
open and not kinked, remove and
service primer pump. Refer to
PRIMER PUMP
on
p.
147.
• If primer pump
is
externally leaking, replace the
a -rings. Refer to
PRIMER PUMP on
p.
147.
IMPORTANT: The three smaller O-rings are
made with a
special material; use only the proper
O-rings.
A built-in fuel inlet check valve
on
the primer pump
housing (under the
small nipple) should allow fuel
to come out
in
one direction and close
in
the other
direction.
The
fuel inlet check valve allows fuel into the end
of the
plunger and out through the hole
in
the side
of the
plunger. Replace if damaged or does not
function.
1. Fuel inlet check valve
2. Small nipple
3.
Plunger
,-,
Ai
--
I I
I I
II
--,I
1 1
'-'
DR2578
FUEL SYSTEM
FUEL SYSTEM TESTS
Fuel Pump Pressure Test
Perform this test with the outboard
in
a test tank or
on
the boat.
Before testing,
loosen fuel tank gas cap momen-
tarily
to release any pressure that may have built
up. Fuel tank must not
be
more than 30 in. (76
cm)
below fuel pump.
Remove carburetor to
fuel pump hose. Connect a
fuel pressure gauge between the carburetor and
fuel pump.
L---------------------~~-------6-3-32~.
III!I
Start outboard and monitor gauge. Pump pressure
must
be
as specified below:
RPM
Pressure
600
1
psi
7 kPa
2500-3000
1.5
psi
10 kPa
4500
2.5
psi
17 kPa
Results:
If pump does not develop minimum pressure,
replace the pump.
145
E
o
o
~
x
~
OJ
~
ii
t:
.s::
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