Mechanical Fuel Pump
Depending on your engine's trim, a Mikuni or Nikki fuel pump
may be installed. The Mikuni fuel pump is characterized by
a round body and the Nikki fuel pump has a square body.
While the appearance my differ, the removal and installation
procedures that follows applies to both, unless noted.
Mechanical Fuel Pump - Removal
1. See
Side Cover - Removal
.
2. Obtain a fuel line clamp. Install the clamp on the fuel
supply hose (
A
, Figure 37) if equipped with a Mikuni fuel
pump, and (
A
, Figure 38) if equipped with a Nikki fuel
pump.
37
38
3. Squeeze the tangs and move the hose clamp away from
the fuel inlet on the fuel pump.
4. Repeat step 2 for the fuel outlet hose (
B
) and pulse hose
(
C
).
5. Remove the fuel inlet, fuel outlet and pulse hose from the
fuel pump.
NOTE:
Some residual fuel may be present in the fuel lines
and pump. Wrap a rag or shop towel around the lines and
pump to catch any spilled fuel. Make sure to clean and
dispose of any spilled fuel in the proper receptacle.
6. Remove the two fasteners that secure the fuel pump to
the mounting bracket (
D
). Remove the fuel pump from
the bracket and set aside.
Mechanical Fuel Pump - Installation
1. Install the fuel pump onto the mounting bracket.
2. Start by hand the two fuel pump fasteners (
D
if equipped with Mikuni pump, and 38 if equipped with
Nikki pump). Tighten to
95 lb-in
(10.7 Nm).
3. Install the fuel feed hose onto the fuel pump inlet port
(
A
).
4. Install the fuel outlet hose (
B
) onto the fuel pump outlet
port.
5. Install the pulse hose (
C
) onto the fuel pump pulse port.
6. Starting with the fuel feed line, squeeze the tangs of the
fuel line clamp and slide the clamp along the hose until
positioned above the port,
1/8 inch
(3 mm) from the end
of the hose. Repeat for the fuel outlet hose and pulse
hose.
7. Remove the fuel line clamp from the fuel feed hose.
8. Prior to installation of the side cover, check the fuel pump
lines for leaks.
Fuel Filter
Fuel Filter - Removal
1. See
Side Cover - Removal
.
2. Squeeze tangs and move hose clamps (
A
away from fuel inlet (
B
) and outlet (
C
) fittings.
39
90
Not for
Reproduction
Summary of Contents for 25E300
Page 1: ...Vanguard EFI Diagnostics and Repair 25E300 REPAIR MANUAL N o t f o r R e p r o d u c t i o n...
Page 18: ...Model 25E300 EFI Component Locations 19 N o t f o r R e p r o d u c t i o n...
Page 26: ...Speed vs Voltage Table 8 27 N o t f o r R e p r o d u c t i o n...
Page 61: ...25E300 Wiring Harness Diagram 62 vanguardpower com N o t f o r R e p r o d u c t i o n...
Page 62: ...63 N o t f o r R e p r o d u c t i o n...
Page 88: ...Model 25E300 Fuel Hose Location and Routing Tankless 89 N o t f o r R e p r o d u c t i o n...
