Information injection-pump assembly
BOSCH
9 460 611 851
9460611851
ZEXEL
104701-3001
1047013001

Rating:
Components :
0. | INJECTION-PUMP ASSEMBLY | 104701-3001 |
1. | _ | |
2. | FUEL INJECTION PUMP | 104601-3001 |
3. | NUMBER PLATE | 148636-0100 |
4. | _ | 479773-9820 |
5. | CAPSULE | |
6. | ADJUSTING DEVICE | |
7. | NOZZLE AND HOLDER ASSY | 105148-1401 |
8. | Nozzle and Holder | ME201844 |
9. | Open Pre:MPa(Kqf/cm2) | 14.7{150} |
10. | NOZZLE-HOLDER | 105078-0181 |
11. | NOZZLE | 105007-1350 |
Scheme ###:
1/6. | [1] | 146601-0700 | PACKING RING |
6. | [1] | 146100-0120 | SUPPLY PUMP |
9. | [1] | 148103-0400 | COVER |
10. | [2] | 139104-0000 | FLAT-HEAD SCREW |
12. | [1] | 148200-0520 | DRIVE SHAFT |
12/3. | [1] | 146201-0000 | WOODRUFF KEY |
17. | [1] | 146204-0000 | PLAIN WASHER |
20. | [1] | 148210-0120 | ROLLER SET |
24. | [1] | 146303-0000 | BEARING PIN |
25. | [1] | 146304-0000 | BEARING PIN |
26. | [1] | 146305-0000 | CLAMPING BAND |
27. | [1] | 146205-0000 | SLOTTED WASHER |
29. | [1] | 146220-4820 | CAM PLATE |
30. | [1] | 146600-3000 | O-RING |
31. | [1] | 146300-1900 | PUMP PLUNGER |
32. | [1] | 146301-0200 | SLIDING PIECE |
33. | [1] | 146603-1100 | SHIM D17.5&7.5T1.20 |
34. | [1] | 146306-1800 | COMPRESSION SPRING |
35/1. | [0] | 146603-0700 | SHIM D17.5&7.5T0.60 |
35/1. | [0] | 146603-0800 | SHIM D17.5&7.5T0.70 |
35/1. | [0] | 146603-0900 | SHIM D17.5&7.5T0.90 |
35/1. | [0] | 146603-1000 | SHIM D17.5&7.5T1.00 |
35/1. | [0] | 146603-1100 | SHIM D17.5&7.5T1.20 |
35/1. | [0] | 146603-3600 | SHIM D17.5&7.5T2.40 |
36. | [1] | 146600-3000 | O-RING |
37. | [1] | 479773-9920 | TIMER PISTON SENSOR |
38. | [2] | 010206-2040 | HEX-SOCKET-HEAD CAP SCREW |
39. | [1] | 146310-0100 | COVER |
40. | [2] | 146620-5000 | BLEEDER SCREW |
43. | [1] | 146230-0000 | SHIM |
44. | [1] | 146230-0100 | PLAIN WASHER |
45. | [1] | 146231-0001 | SLOTTED WASHER |
47. | [2] | 146233-0000 | SLOTTED WASHER |
48/1. | [1] | 146603-0000 | SHIM D17.0&5.2T0.50 |
48/1. | [1] | 146603-0100 | SHIM D17.0&5.2T0.80 |
48/1. | [1] | 146603-0200 | SHIM D17.0&5.2T1.00 |
48/1. | [1] | 146603-0300 | SHIM D17.0&5.2T1.20 |
48/1. | [1] | 146603-0400 | SHIM D17.0&5.2T1.50 |
48/1. | [1] | 146603-0500 | SHIM D17.0&5.2T1.80 |
48/1. | [1] | 146603-0600 | SHIM D17.0&5.2T2.00 |
48/1. | [1] | 146690-1400 | SHIM D17&5.2T0.9 |
48/1. | [1] | 146690-1500 | SHIM D17&5.2T1.1 |
48/1. | [1] | 146690-1600 | SHIM D17&5.2T1.3 |
48/1. | [1] | 146690-1700 | SHIM D17&5.2T1.4 |
48/1. | [1] | 146690-1800 | SHIM D17&5.2T1.6 |
48/1. | [1] | 146690-1900 | SHIM D17&5.2T1.7 |
48/1. | [1] | 146690-5800 | SHIM D17&5.2T2.1 |
48/1. | [1] | 146690-5900 | SHIM |
48/1. | [1] | 146690-6000 | SHIM D17&5.2T2.3 |
48/1. | [1] | 146690-6100 | SHIM D17&5.2T2.4 |
48/1. | [1] | 146690-6200 | SHIM |
48/1. | [1] | 146690-6300 | SHIM D17&5.2T2.6 |
48/1. | [1] | 146690-6400 | SHIM D17&5.2T2.7 |
48/1. | [1] | 146690-6500 | SHIM D17&5.2T2.8 |
48/1. | [1] | 146690-6600 | SHIM D17&5.2T2.9 |
48/1. | [1] | 146690-6700 | SHIM |
48/1. | [1] | 146690-6800 | SHIM D17&5.2T3.1 |
48/1. | [1] | 146690-6900 | SHIM D17&5.2T3.2 |
48/1. | [1] | 146690-7000 | SHIM D17&5.2T3.3 |
48/1. | [1] | 146690-7100 | SHIM D17&5.2T3.4 |
48/1. | [1] | 146690-7200 | SHIM D17&5.2T0.4 |
48/1. | [1] | 146690-7300 | SHIM D17&5.2T0.6 |
48/1. | [1] | 146690-7400 | SHIM D17&5.2T0.7 |
48/1. | [1] | 146690-7500 | SHIM D17&5.2T1.9 |
48/1. | [1] | 146690-7800 | SHIM D17&5.2T0.2 |
49. | [2] | 146234-0120 | GUIDE PIN |
50. | [1] | 146403-6120 | HYDRAULIC HEAD |
50. | [1] | 146403-6120 | HYDRAULIC HEAD |
50. | [1] | 146403-6120 | HYDRAULIC HEAD |
51. | [1] | 146600-0000 | O-RING |
52/1. | [1] | 146420-0000 | SHIM D9.5&3.0T1.90 |
52/1. | [1] | 146420-0100 | SHIM D9.5&3.0T1.92 |
52/1. | [1] | 146420-0200 | SHIM D9.5&3.0T1.94 |
52/1. | [1] | 146420-0300 | SHIM D9.5&3.0T1.96 |
52/1. | [1] | 146420-0400 | SHIM D9.5&3.0T1.98 |
52/1. | [1] | 146420-0500 | SHIM D9.5&3.0T2.00 |
52/1. | [1] | 146420-0600 | SHIM D9.5&3.0T2.02 |
52/1. | [1] | 146420-0700 | SHIM D9.5&3.0T2.04 |
52/1. | [1] | 146420-0800 | SHIM D9.5&3.0T2.06 |
52/1. | [1] | 146420-0900 | SHIM D9.5&3.0T2.08 |
52/1. | [1] | 146420-1000 | SHIM D9.5&3.0T2.10 |
52/1. | [1] | 146420-1100 | SHIM D9.5&3.0T2.12 |
52/1. | [1] | 146420-1200 | SHIM D9.5&3.0T2.14 |
52/1. | [1] | 146420-1300 | SHIM D9.5&3.0T2.16 |
52/1. | [1] | 146420-1400 | SHIM D9.5&3.0T2.18 |
52/1. | [1] | 146420-1500 | SHIM D9.5&3.0T2.20 |
52/1. | [1] | 146420-1600 | SHIM D9.5&3.0T2.22 |
52/1. | [1] | 146420-1700 | SHIM D9.5&3.0T2.24 |
52/1. | [1] | 146420-1800 | SHIM D9.5&3.0T2.26 |
52/1. | [1] | 146420-1900 | SHIM D9.5&3.0T2.28 |
52/1. | [1] | 146420-2000 | SHIM D9.5&3.0T2.30 |
52/1. | [1] | 146420-2100 | SHIM D9.5&3.0T2.32 |
52/1. | [1] | 146420-2200 | SHIM D9.5&3.0T2.34 |
52/1. | [1] | 146420-2300 | SHIM D9.5&3.0T2.36 |
52/1. | [1] | 146420-2400 | SHIM D9.5&3.0T2.38 |
52/1. | [1] | 146420-2500 | SHIM D9.5&3.0T2.40 |
52/1. | [1] | 146420-2600 | SHIM D9.5&3.0T2.42 |
52/1. | [1] | 146420-2700 | SHIM D9.5&3.0T2.44 |
52/1. | [1] | 146420-2800 | SHIM D9.5&3.0T2.46 |
52/1. | [1] | 146420-2900 | SHIM D9.5&3.0T2.48 |
52/1. | [1] | 146420-3000 | SHIM D9.5&3.0T2.50 |
52/1. | [1] | 146420-3100 | SHIM D9.5&3.0T2.52 |
52/1. | [1] | 146420-3200 | SHIM D9.5&3.0T2.54 |
52/1. | [1] | 146420-3300 | SHIM D9.5&3.0T2.56 |
52/1. | [1] | 146420-3400 | SHIM D9.5&3.0T2.58 |
52/1. | [1] | 146420-3500 | SHIM D9.5&3.0T2.60 |
52/1. | [1] | 146420-3600 | SHIM D9.5&3.0T2.62 |
52/1. | [1] | 146420-3700 | SHIM D9.5&3.0T2.64 |
52/1. | [1] | 146420-3800 | SHIM D9.5&3.0T2.66 |
52/1. | [1] | 146420-3900 | SHIM D9.5&3.0T2.68 |
52/1. | [1] | 146420-4000 | SHIM D9.5&3.0T2.70 |
52/1. | [1] | 146420-4100 | SHIM D9.5&3.0T2.72 |
52/1. | [1] | 146420-4200 | SHIM D9.5&3.0T2.74 |
52/1. | [1] | 146420-4300 | SHIM D9.5&3.0T2.76 |
52/1. | [1] | 146420-4400 | SHIM D9.5&3.0T2.78 |
52/1. | [1] | 146420-4500 | SHIM D9.5&3.0T2.80 |
52/1. | [1] | 146420-4600 | SHIM D9.5&3.0T2.82 |
52/1. | [1] | 146420-4700 | SHIM D9.5&3.0T2.84 |
52/1. | [1] | 146420-4800 | SHIM D9.5&3.0T2.86 |
52/1. | [1] | 146420-4900 | SHIM D9.5&3.0T2.88 |
52/1. | [1] | 146420-5000 | SHIM D9.5&3.0T2.90 |
52/1. | [1] | 146420-5100 | SHIM D9.5&3.0T1.74 |
52/1. | [1] | 146420-5200 | SHIM D9.5&3.0T1.76 |
52/1. | [1] | 146420-5300 | SHIM D9.5&3.0T1.78 |
52/1. | [1] | 146420-5400 | SHIM D9.5&3.0T1.80 |
52/1. | [1] | 146420-5500 | SHIM D9.5&3.0T1.82 |
52/1. | [1] | 146420-5600 | SHIM D9.5&3.0T1.84 |
52/1. | [1] | 146420-5700 | SHIM D9.5&3.0T1.86 |
52/1. | [1] | 146420-5800 | SHIM D9.5&3.0T1.88 |
54. | [4] | 146433-0100 | GASKET D12&6.4T1.00 |
55. | [4] | 146430-0320 | DELIVERY-VALVE ASSEMBLY |
56. | [4] | 146432-0700 | COMPRESSION SPRING |
58. | [4] | 146440-0720 | FITTING |
60. | [3] | 139106-0100 | FLAT-HEAD SCREW |
123. | [1] | 146620-8800 | FLAT-HEAD SCREW |
130. | [1] | 146421-1020 | CAPSULE |
130/2. | [1] | 139508-0200 | GASKET D11.4&8.2T1 |
130/3. | [1] | 146422-0300 | BLEEDER SCREW |
130/4. | [1] | 146600-0500 | O-RING |
133. | [1] | 146600-0600 | O-RING |
134. | [1] | 146600-0700 | O-RING |
135. | [1] | 146110-1120 | CONTROL VALVE |
135/5. | [1] | 146114-0000 | SPRING WASHER |
136. | [1] | 148120-0020 | OVER FLOW VALVE |
137. | [3] | 139512-0500 | GASKET |
138. | [1] | 146668-3220 | INLET UNION |
158. | [1] | 146614-6900 | SPACER BUSHING |
200. | [1] | 146206-0100 | COILED SPRING |
205. | [1] | 029470-4030 | WOODRUFF KEY |
232. | [1] | 148613-1920 | BRACKET |
234. | [1] | 146620-2700 | HEX-SOCKET-HEAD CAP SCREW |
236. | [1] | 146620-2700 | HEX-SOCKET-HEAD CAP SCREW |
237. | [1] | 146620-0200 | HEX-SOCKET-HEAD CAP SCREW |
240. | [1] | 146650-1220 | PULLING ELECTROMAGNET |
240/8. | [1] | 146600-1700 | O-RING |
243. | [1] | 146621-1000 | UNION NUT |
244. | [1] | 148613-2420 | BRACKET |
245. | [3] | 139512-0500 | GASKET |
246. | [1] | 139812-0500 | EYE BOLT |
247. | [1] | 146668-5220 | INLET UNION |
248. | [1] | 146614-0200 | SPACER BUSHING |
282. | [1] | 139006-4400 | BLEEDER SCREW |
504. | [1] | 146649-5100 | RESISTER |
505. | [1] | 148530-1420 | GOVERNOR;ELECTRIC |
506. | [3] | 146620-8900 | FLAT-HEAD SCREW |
515. | [1] | 106144-1040 | TIMING CONTROL VALVE |
515/12. | [1] | 161440-3800 | O-RING |
515/13. | [1] | 161440-3700 | O-RING |
516. | [2] | 010206-1440 | HEX-SOCKET-HEAD CAP SCREW M6P1L14 |
531. | [1] | 479773-9820 | PULSE GENERATOR |
800S. | [1] | 148009-0620 | PUMP HOUSING |
800S/1/6. | [1] | 146601-0700 | PACKING RING |
800S/1/6. | [1] | 146601-0700 | PACKING RING |
804S. | [1] | 146232-0720 | COMPRESSION SPRING |
878S. | [1] | 148600-1300 | SEAL RING |
906. | [1] | 148636-0100 | NAMEPLATE |
908. | [1] | 148621-0000 | UNION NUT |
910S. | [1] | 146600-4520 | PARTS SET |
910S. | [1] | 146600-4520 | PARTS SET |
911S. | [1] | 479773-9820 | PULSE GENERATOR |
912S. | [1] | 139508-0200 | GASKET D11.4&8.2T1 |
913S. | [1] | 146422-0300 | BLEEDER SCREW |
914S. | [1] | 146699-0020 | VALVE SET |
914S. | [1] | 146699-0020 | VALVE SET |
914S. | [1] | 146699-0020 | VALVE SET |
916S. | [1] | 025804-1610 | WOODRUFF KEY |
941. | [1] | 148600-2500 | O-RING |
942. | [1] | 148611-0000 | PLATE |
943. | [2] | 148621-0200 | PLAIN WASHER |
944. | [2] | 148621-0100 | UNION NUT |
945. | [1] | 148615-0000 | TOOTHED GEAR |
Include in #2:
104701-3001
as INJECTION-PUMP ASSEMBLY
Cross reference number
BOSCH
9 460 611 851
9460611851
ZEXEL
104701-3001
1047013001
Zexel num
Bosch num
Firm num
Name
Calibration Data:
Adjustment conditions
Test oil
1404 Test oil ISO4113orSAEJ967d
1404 Test oil ISO4113orSAEJ967d
Test oil temperature
degC
45
45
50
Nozzle
105780-0060
Bosch type code
NP-DN0SD1510
Nozzle holder
105780-2150
Opening pressure
MPa
133
133
136
Opening pressure
kgf/cm2
133
133
136
Injection pipe
157805-7320
Injection pipe
Inside diameter - outside diameter - length (mm) mm 2-6-450
Inside diameter - outside diameter - length (mm) mm 2-6-450
Joint assembly
157641-4720
Tube assembly
157641-4020
Transfer pump pressure
kPa
20
20
20
Transfer pump pressure
kgf/cm2
0.2
0.2
0.2
Direction of rotation (viewed from drive side)
Right R
Right R
Manual controller assembly
105782-8280
Manual controller
105782-8270
Wire harness
407980-2390
Intermediate harness
407980-2400
Governor adjustment
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Pump chamber pressure
kPa
588.5
559
618
Pump chamber pressure
kgf/cm2
6
5.7
6.3
Basic
*
Governor adjustment_02
Pump speed
r/min
100
100
100
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Pump chamber pressure
kPa
294
294
Pump chamber pressure
kgf/cm2
3
3
Governor adjustment_03
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Pump chamber pressure
kPa
588
549
627
Pump chamber pressure
kgf/cm2
6
5.6
6.4
Governor adjustment_04
Pump speed
r/min
2000
2000
2000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Pump chamber pressure
kPa
726
677
775
Pump chamber pressure
kgf/cm2
7.4
6.9
7.9
Boost compensator adjustment
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
8.6
8.4
8.8
Basic
*
Boost compensator adjustment_02
Pump speed
r/min
100
100
100
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
3
0.9
5.1
Boost compensator adjustment_03
Pump speed
r/min
350
350
350
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
6.3
4.2
8.4
Boost compensator adjustment_04
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
8.6
8.3
8.9
Boost compensator adjustment_05
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
80
80
80
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
3.6
2
5.2
Boost compensator adjustment_06
Pump speed
r/min
1800
1800
1800
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
9.75
9.3
10.2
Boost compensator adjustment_07
Pump speed
r/min
2300
2300
2300
TCV duty (%) F TCV 60Hz
%
0
0
0
U alpha soll
V
2.81
2.81
2.81
Timer stroke
mm
0
0
0
Timer adjustment
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
0
0
0
U alpha soll
V
2.81
2.81
2.81
Vtps
V
0.77
0.45
1.09
Basic
*
Timer adjustment_02
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
0
0
0
U alpha soll
V
2.81
2.81
2.81
Vtps
V
0.77
0.45
1.09
Timer adjustment_03
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Vtps
V
3.704
3.3
4.108
Speed control lever angle
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Overflow quantity
cm3/min
560
430
690
0000000901
Pump speed
r/min
1000
1000
1000
U alpha soll + dU alpha soll
V
2.81
2.81
2.81
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
83.8
83.3
84.3
Difference in delivery
mm3/st.
6
Basic
*
_02
Pump speed
r/min
375
375
375
U alpha soll + dU alpha soll
V
2.17
2.17
2.17
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
24.2
20.7
27.7
Difference in delivery
mm3/st.
2.5
Basic
*
Remarks
Confirmation of difference in delivery
Confirmation of difference in delivery
_03
Pump speed
r/min
100
100
100
U alpha soll + dU alpha soll
V
3.15
3.15
3.15
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
68.2
58.2
78.2
_04
Pump speed
r/min
375
375
375
U alpha soll + dU alpha soll
V
2.17
2.17
2.17
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
24.2
20.7
27.7
_05
Pump speed
r/min
600
600
600
U alpha soll + dU alpha soll
V
2.56
2.56
2.56
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
62.1
59.1
65.1
_06
Pump speed
r/min
750
750
750
U alpha soll + dU alpha soll
V
2.5
2.5
2.5
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
59.3
56.3
62.3
_07
Pump speed
r/min
800
800
800
U alpha soll + dU alpha soll
V
2.77
2.77
2.77
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
80.8
77.8
83.8
_08
Pump speed
r/min
1000
1000
1000
U alpha soll + dU alpha soll
V
2.81
2.81
2.81
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
83.8
82.8
84.8
_09
Pump speed
r/min
1500
1500
1500
U alpha soll + dU alpha soll
V
2.87
2.87
2.87
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
87.7
84.7
90.7
_10
Pump speed
r/min
2000
2000
2000
U alpha soll + dU alpha soll
V
2.72
2.72
2.72
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
74.8
71.8
77.8
_11
Pump speed
r/min
2450
2450
2450
U alpha soll + dU alpha soll
V
1.72
1.72
1.72
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
mm3/st.
24.4
21.4
27.4
Stop lever angle
Pump speed
r/min
2000
2000
2000
U alpha soll + dU alpha soll
V
2.72
2.72
2.72
TCV duty (%) F TCV 60Hz
%
100
100
100
Average injection quantity
cm3/min
0
0
0
0000001101
Pump speed
r/min
200
200
200
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Speed output
N=Measure the actual speed. r/min N+-8
N=Measure the actual speed. r/min N+-8
0000001201
Pump speed
r/min
1000
1000
1000
TCV duty (%) F TCV 60Hz
%
100
100
100
U alpha soll
V
2.81
2.81
2.81
Temperature output
Measure T = actual output temperature degC T+-5
Measure T = actual output temperature degC T+-5
0000001301
Max. applied voltage
V
8
8
8
Test voltage
V
13
12
14
0000001401
K dimension
mm
3.3
3.2
3.4
KF dimension
mm
5.62
5.52
5.72
Pre-stroke
mm
0.1
0.08
0.12
Test data Ex:
Injection timing adjustment Comp. resistor/voltage

Compensation resistance/compensation voltage comparison
A = Compensation resistor number
B= Compensation resistance
C = Compensation voltage delta U alpha soll
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Information:
1. Unscrew and remove filter (right hand thread). 2. Clean the filter housing base. Be sure all of old filter gasket is removed. 3. Lubricate the filter gasket with clean diesel fuel and fill the filter with clean diesel fuel. 4. Install the filter. Tighten filter by hand until gasket contacts base; then tighten 1/2 turn more.5. Prime the system. Priming Fuel System:1. Loosen the cap on the tee on top of fuel filter base. 2. Operate starter until the flow of fuel from the filter is continuous and free of bubbles.3. Tighten cap. If engine fails to start, misfires or smokes, further priming is necessary.4. Loosen each fuel line nut one at a time at