fuel pump is part of the vro pump. the bulb is not going to be hard when the motor is running, because, once the motor starts the fuel (VRO) pump, is pulling fuel thru the bulb.
is the motor running good? whats the problem? if bad fuel pump you couldnt run WOTor run poorly... do you have an alarm on the boat? low oil flow is a constant beep every 1/2 second