O.S. Engines 91SX-H Competition Special (P) - Manual (Page 8)

14
To return the fuel to the tank
muffler pressure
Silencer
Fuel tank
Fuel flow
Pump
Commercialy
available nipple
1.
15
2. To return the fuel in front the pump
using the T nipple.
muffler pressure
Silencer
Fuel tank
Fuel flow
Pump
In this case, fitting an additional nipple on the tank is
not required. However, pumped out fuel pressure is
increased, and the main needle needs to be closed
further, which results in a sensitive needle reaction
and mixture gets lean at halh throttle with some
types mufflers. In this case, it is suggested to use
yhe pattern 1.
T nipple