Checking The Primer Pump; Checking The Fuel Joint - Yamaha 55DEHD Service Manual

Checking the primer pump

1. Place a drain pan under the fuel hose
connections, and then disconnect the
fuel hose from the primer pump.
2. Connect the special service tool 1 to the
primer pump inlet hose.
3. Cover the fuel outlet 2 with a finger.
4. Apply the specified positive pressure to
check that the pressure is maintained for
at least 30 seconds.
Replace the primer pump if it is not main-
tained.
2
1
Leakage tester 1: 90890-06840
Specified positive pressure:
170 kPa (1.7 kgf/cm
6885J11
68840120
2 , 25 psi)

Checking the fuel joint

1. Disconnect the fuel hose, and then
remove the fuel joint.
2. Check the fuel joint for cracks or damage.
3. Connect the special service tool 1 at the
outlet of fuel joint.
4. Apply the specified pressure to check
that the positive pressure is maintained
for 10 seconds. Replace the fuel joint if it
is not maintained.
Vacuum/pressure pump gauge set 1:
90890-06756
Specified positive pressure:
50 kPa (0.5 kgf/cm
5. Install the fuel joint, and then connect the
fuel hose.
Fuel pump
1
2
3
1
4
69R40025
5
6
, 7.3 psi)
2
7
8
9
4-6