Liquid fuel system

[guywithproblems]

I have been thinking about switching to liquid fuel system, but I have some problems with making it like what nozzle should I use and where do I find a pump for it?

[richardm]

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

[guywithproblems]

Can you give me the link for the fuel pump?

[richardm]

Plenty of em all around You can get an used one cheap www.ebay.ca/itm/374908331289?chn=ps&norover=1&mkevt=1&mkrid=706-89093-2056-0&mkcid=2&mkscid=101&itemid=374908331289&targetid=1659317104777&device=c&mktype=pla&googleloc=9000328&poi=&campaignid=17288923165&mkgroupid=135230546845&rlsatarget=pla-1659317104777&abcId=9300873&merchantid=10252592&gclid=CjwKCAiAiP2tBhBXEiwACslfng5jy0P3RoioYqErUJ2hPmk1HrV9hp1ouoZhvzU84zTqr0dCV5ajfxoCDXwQAvD_BwE

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

[richardm]

Or you can opt for a small hydraulic pump so that you won't need to modify it. make sure the sea are resistant to the fuel you re planning to use Fuel flow control remains pretty much the same

[wannabebuilderuk]

Feb 4, 2024 11:33:46 GMT -5 richardm said:

Or you can opt for a small hydraulic pump so that you won't need to modify it. make sure the sea are resistant to the fuel you re planning to use Fuel flow control remains pretty much the same

Prices have gone through the roof if you go via Ebay, aliexpress/banggood is probably cheaper.

I paid ~£38 all in a few years and www.ebay.co.uk/itm/285205356660.

You can also get hydraulic pumps from the fan motors on bus engines, they can't be directly connected to the crankshaft so most use a motor to remotely power the fan which can also be used as a pump. See halfway down the page where I got one. jetandturbineowners.proboards.com/thread/1398/build-thread-finally-garrett-tv8101?page=3

[guywithproblems]

Thanks a lot I Will use your tips for finding a good fuel pump for the jet but which spray nozzle do you use?

[wannabebuilderuk]

Feb 5, 2024 10:50:33 GMT -5 guywithproblems said:

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.

[guywithproblems]

How about the size of the nozzle? How many gph would I need for it? i currently have a turbo with 38mm inducer.

[racket]

~2 GPH nozzle if running 350 psi

[guywithproblems]

Feb 4, 2024 16:48:54 GMT -5 wannabebuilderuk said:

Feb 4, 2024 11:33:46 GMT -5 richardm said:

Or you can opt for a small hydraulic pump so that you won't need to modify it. make sure the sea are resistant to the fuel you re planning to use Fuel flow control remains pretty much the same

Prices have gone through the roof if you go via Ebay, aliexpress/banggood is probably cheaper.

I paid ~£38 all in a few years and www.ebay.co.uk/itm/285205356660.

You can also get hydraulic pumps from the fan motors on bus engines, they can't be directly connected to the crankshaft so most use a motor to remotely power the fan which can also be used as a pump. See halfway down the page where I got one. jetandturbineowners.proboards.com/thread/1398/build-thread-finally-garrett-tv8101?page=3

Is this strong enough motor for the pump www.amazon.com/Vevitts-Brushed-Electric-Permanent-Scooter/dp/B09KRGTLVM/ref=mp_s_a_1_5?keywords=500+watt+motor&qid=1707465550&sr=8-5

[richardm]

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

[wannabebuilderuk]

Feb 9, 2024 5:57:40 GMT -5 guywithproblems said:

Feb 4, 2024 16:48:54 GMT -5 wannabebuilderuk said:

Prices have gone through the roof if you go via Ebay, aliexpress/banggood is probably cheaper.

I paid ~£38 all in a few years and www.ebay.co.uk/itm/285205356660.

You can also get hydraulic pumps from the fan motors on bus engines, they can't be directly connected to the crankshaft so most use a motor to remotely power the fan which can also be used as a pump. See halfway down the page where I got one. jetandturbineowners.proboards.com/thread/1398/build-thread-finally-garrett-tv8101?page=3

Is this strong enough motor for the pump www.amazon.com/Vevitts-Brushed-Electric-Permanent-Scooter/dp/B09KRGTLVM/ref=mp_s_a_1_5?keywords=500+watt+motor&qid=1707465550&sr=8-5

I'm using the 500w version coupled to a 1ml/r hydraulic gear pump, running at 12v it maxes at 300psi, 24v it reaches 750psi.

[richardm]

That should be plenty enough for your nozzle PWM control ?

[guywithproblems]

Feb 9, 2024 10:01:47 GMT -5 richardm said:

That should be plenty enough for your nozzle PWM control ?

Yes it is plenty of room for throttle control