FUEL PUMP CONTROL DEVICE FOR ENGINE

PROBLEM TO BE SOLVED: To prevent excessive fuel delivery of a fuel pump and to also reliably avoid insufficiency in the delivery amount associated with rapid increase in rotational speed upon acceleration.SOLUTION: It is determined whether a transmission gear position of an automatic transmission is a low-speed gear position or a high-speed gear position (S2). A battery voltage of about 12 V is applied to a fuel pump without boosting the voltage by power generation of an alternator when an engine rotational speed at any transmission gear position is less than a first threshold, the voltage of 13 V is applied by the power generation of the alternator when it is equal to or more than the first threshold (S3, S8). In the case of the low-speed gear position, the voltage of 14 V is established when the rotational speed is equal to or more than a second threshold (S5, S6). In the case of the high-speed gear position, the voltage of 14 V is established when the rotational speed is equal to or more than a third threshold (S9, S10). The second threshold is set at a low-speed side as compared with the third threshold. Although the rotational speed of the low-speed gear position rapidly increases upon acceleration, the 14 V is established beforehand at the second threshold, so that the necessary delivery amount is secured.