Yanmar 6LY3 series - Testing the Fuel Feed Pump

FUEL SYSTEM
Fuel Feed Pump Components and Functions
12/05
6LY3 Service Manual
6-31
© 2007 Yanmar Marine International
Testing the Fuel Feed Pump
1. Install the fuel feed pump onto the injection
pump.
2. Run the fuel line directly from tank as shown in
Figure 6-39. Fuel piping should be provided
directly from the tank, not through the delivery
pump for this test.
Figure 6-39
Figure 6-39
1 – From Fuel Tank
2 – Fuel Delivery
Suction Test for the Priming Pump
Loosen the handle of the priming pump and push
the handle at 60-100 strokes / minute. If fuel comes
out of the delivery side of the feed pump
(Figure 6-40, (4)) after about 30 strokes, the
priming pump is normal. If it takes longer, replace
the priming pump as a set.
Figure 6-4 0
Figure 6-40
1 – Valve “B”
2 – Pressure Gauge
3 – Valve “A”
4–Feed Pump
(1)
0005702
(2)
0005703
Suction Test Specifications
Suction Head 1 m (3.2 ft)
Within 30 strokes
Suction Pipe
Diameter
Ø8 m (3.149 in.)
0005704
(3)
(4)
(1)
(2)