The Force power
Commander
- Joined
- Feb 3, 2019
- Messages
- 2,250
I found in an old post something applies to me, as my fuel pump is square & I think this is what mine is.
please see below old posting & if someone knows the part# for the repair-kit; please let me know
Force 90 dual stage fuel pump
The pulses from the by-pass port which is fed through the small hole in the by-pass port cover and the hose from the crankcase acting against the diaphragm is what makes the fuel pump work. The one-way check valves keep the fuel flowing in one direction inside the pump and out to the carbs. Looks like the spring and washer (item #7 & #12) on the modified version positions the diaphragm to maybe push more fuel with each pulse.
NOTE: I installed the newer square type Mercury fuel pump on an old 1988 125 HP motor. I got a used by-pass cover and fuel pump from a later model motor on-line. The by-pass cover bolt pattern and size are the same for many of the motors. Just need one that matches up to the correct type of fuel pump. The newer square pumps have a different type of check valve(s) and they are included with the re-build kits. Plus the rebuild kits are cheaper for the Mercury style fuel pumps.
please see below old posting & if someone knows the part# for the repair-kit; please let me know
Force 90 dual stage fuel pump
The pulses from the by-pass port which is fed through the small hole in the by-pass port cover and the hose from the crankcase acting against the diaphragm is what makes the fuel pump work. The one-way check valves keep the fuel flowing in one direction inside the pump and out to the carbs. Looks like the spring and washer (item #7 & #12) on the modified version positions the diaphragm to maybe push more fuel with each pulse.
NOTE: I installed the newer square type Mercury fuel pump on an old 1988 125 HP motor. I got a used by-pass cover and fuel pump from a later model motor on-line. The by-pass cover bolt pattern and size are the same for many of the motors. Just need one that matches up to the correct type of fuel pump. The newer square pumps have a different type of check valve(s) and they are included with the re-build kits. Plus the rebuild kits are cheaper for the Mercury style fuel pumps.