I m using a domestic furnace oil burner pump It has been modified by removing the pressure regulator and the clean cut in / out device. Its capable of over 300 psi on a 12 volts motor Some guys use a small hydraulic pump. Oil burner nozzle can be used given it has the right capacity and spray angle
Or you can go for a brand new one .Avoid those with a solenoid cut off . Now you ll find some rated at 3500 or 1750 rpm Try to match to your motor speed, You will need to disable the clean cut system and the pressure regulator. On my set up I use an external regulator to limit max pressure. Disabling the clean cut in/ cut out is needed otherwise you can't get variable pressure and you will need to bleed the pump to get it started. In other words you just keep the gear system in the pump. But this can be a bit tricky depending on the model as some internal passage must be either blocked or kept open Depends on the model. Make sure to keep the shaft seal drain open to suction side you can then control fuel flow by varying the motor speed or with a bypass valve of some sort. I use an adjustable pressure regulator of my own make But that's another story
Thanks a lot I Will use your tips for finding a good fuel pump for the jet but which spray nozzle do you use?
80° hollowcone or solid is usually the standard to go with, you don't want anything with an angle below 60° otherwise it'll spray more towards the end of the combustion chamber before mixing which isn't ideal.
In my opinion it could do the job. But I would first determine my fuel volume and pressure requirements and then get a suitable pump. I would not go for too much of an oversized pump as it would draw more power uselessly . Once you know what you need you can dig the web and find the power This one is in french sudenga.com/resources/hp-required-to-drive-a-hydraulic-pump/
You need to factor in some inefficiencies Just double your results and you should be ok How you connect the motor to the pump is also quite important. Any shaft misalignment will draw more power even when using a flexible coupler. You can fell it by turning your pump/ motor by hand or use a power supply with some power display and tweak your alignment to draw as little power as you can.
My oil burner pump is driven by an reverse osmosis pump motor I get 300 + psi at the nozzle drawing about 45 watts. You can seat it on my" Fuel Pump "Post. My nozzle is from a PT- 6 engine and sprays about 25 - 30 liters an hour