Sym GTS 250 Service Manual page 234

Liquid-level gauge electrical resistance measurement
a). Dissemble the coupler of Fuel Pump.
b). Use the Ohm function of the electrical meter to check the resistance value of
liquid-level gauge. Shown in Figure 17a. (Pin assign is shown in Figure 17b)
Figure 17a. Electrical resistance
measurement
Fuel pressure measurement
a). Use a fuel pressure gauge to connect between fuel tank and fuel injector, as shown in
figure 18.
Figure 18. Fuel pressure measurement
Fuel pump(-)
Pin (2)
Fuel Pump
(+) Pin (1)
Figure 17b. The view of coupler from fuel tank side
19
Liquid-level
gauge(-) Pin (4)
Liquid-level
gauge (+)Pin(3)