To avoid the high cost and desperate searching for used parts, I've successfully replaced the Vapor Separator Tank (VST), Choke / Primer, and Fuel Pump on my 1998 Johnson 115 Fast Strike outboard. It has been tested and performs without flaw. The design was approached to have less-costly replaceable durable components designed to work with petrol and oil mixture.
GOALS
1) Create a vapor / fuel return-to-tank system with adjustable fuel rail pressure
2) Maintain a low-pressure, high-volume fuel supply
3) Ensure proper filtration without loss of fuel flow and/or pressure
4) Have a working choke / primer fuel-to-intake injection system
5) Have a back-up fuel pump
TRADE-OFFS
1) Required to pre-mix oil and gas (-)
2) No fear of fuel pump failure (+)
3) No primer bulb to hand pump (+)
4) Ensured fuel line air bubble removal (+)
5) Electric fuel pump pressure not deadheading (+)
6) Fuel between outboard and tank is circulated and therefore does not heat up (+)
7) Less-costly replacement parts that are durable and easy to get (+)
8) Sit down, turn the key to ACC position, wait 5 seconds for the fuel pump to pick up fuel, depress switch for a second to inject fuel, and crank outboard (+)
GOALS
1) Create a vapor / fuel return-to-tank system with adjustable fuel rail pressure
2) Maintain a low-pressure, high-volume fuel supply
3) Ensure proper filtration without loss of fuel flow and/or pressure
4) Have a working choke / primer fuel-to-intake injection system
5) Have a back-up fuel pump
TRADE-OFFS
1) Required to pre-mix oil and gas (-)
2) No fear of fuel pump failure (+)
3) No primer bulb to hand pump (+)
4) Ensured fuel line air bubble removal (+)
5) Electric fuel pump pressure not deadheading (+)
6) Fuel between outboard and tank is circulated and therefore does not heat up (+)
7) Less-costly replacement parts that are durable and easy to get (+)
8) Sit down, turn the key to ACC position, wait 5 seconds for the fuel pump to pick up fuel, depress switch for a second to inject fuel, and crank outboard (+)
