Testing The Fuel Feed Pump - Yanmar 6LY3 series Service Manual

Fuel Feed Pump Components and Functions
12/05

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
(1)
(2)
Figure 6-39
1 – From Fuel Tank
2 – Fuel Delivery
6LY3 Service Manual
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 6-40
0005702
0005703
© 2007 Yanmar Marine International
Suction Test Specifications
Suction Head 1 m (3.2 ft)
Suction Pipe
Ø8 m (3.149 in.)
Diameter
(1)
Figure 6-40
1 – Valve "B"
2 – Pressure Gauge
3 – Valve "A"
4 – Feed Pump
FUEL SYSTEM
Within 30 strokes
(2)
(3)
(4)
0005704
6-31