Home › Forum › Ask A Member › 1957 RD 19 Johnson 35 HP conversion to fuel pump › Reply To: 1957 RD 19 Johnson 35 HP conversion to fuel pump
basically the process involves getting a source of crankcase pulse to run the new fuel pump.
changing the side fuel connector (find out beforestarting your project)
hooking up the new side connector to the pump inlet and the pump outlet sent to the fuel inlet where the old hose was.
you can use the old pulse nipple feeding air to the old gas tank but you must modify the flapper valve behind the carb base plate.
gets tricky but not hard to do. never done it on a RD but most likely doable….
look at this video on a smaller engine same principle.
https://www.youtube.com/watch?v=FtG4M7ye1N8
one simple method is to plug the pressure nipple shut carefully remove and drill a .25 hole in a bypass cover center and tap it for a nipple (Apply red locktite to threads) this will provide pulsing for the pump via a new “pulse hose” to reach the pump’s pulse nipple.
hook it up to the fuel pump pulse nipple and hook up the in-out fuel lines desc. above. see example picture of a tapped bypass cover
Another method on a smaller 10 hp FD is to drill the bypass cover and fit a drilled /16th aluminum plate (with a hole behind the pump) plate & mount pump & gasket over it…if it fits under the cowl
pictures are just a guide you will need to adapt the pump but it is all the same process
- get a crankcase pulse to drive the pump
- hook-up the pump
- change the side connector to single line.
suggest you download the bible for your RD maintenance and clear pictures.. book covers oldies from TN JW cd ad fd rd maintenance
https://watercraftmanuals.com/outboard/johnson/manuals/johnson-302231.htm
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