Honda BF115A, BF130A Outboard Motors Shop Manual., Page 380Get this manual
18OPERATION I.PROGRAMMED FUEL INJECTION SYSTEM (PGM-Fl)
BF115A13OA
IPROGRAMMED FUEL INJECTION SYSTEM (PGM-Fl)
The BFlI5NBFI3OA outboard motor is equipped with programmed fuel injection system (PGM-Fl) which allows accurate fuel control and thereby achieves high output power and low fuel consumptionIt also has the following featuresFeatures
1) The speed density type, which is excellent in response to changes the running conditions and provides accurate control of the injection amount, is adopted to determine the required fuel injection amount for the engineIt deter-
mines the basic injection amount based on engine speed and intake manifold pressure2) The two-group injection is adopted; this method injects fuel at each group of the cylinders separately by dividing the four cylinders, each of which is equipped with fuel injector, into the two groups3) The gap between the intake manifold vacuum and the fuel pressure is controlled to be constant by the pressure regulatorThis maintains the correct fule injection amount regardless of the change in the intake manifold vacuum4) The high-precision 16-bit digital computer (ECM) of the latest semiconductor technology is adopted to determine the fuel injection amount and the injection duration