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edit: in case it's blocked in your country due to the audio,

**here it is without sound.**

edit 2:

**For hybrids**:

Same calculation, just multiply the resulting fuel volume by whatever mix number you want to achieve.

**It's important that you consider the dead space after the check valve of your pump to be part of the chamber volume when making your calculations, especially for small chambers.**

The calculation is as follows:

(ideal fuel % / 100) x (chamber + pump dead volume) x mix number

In the case of

**this Beto shock pump**, the dead volume is 1.75mL. For a 10mL chamber using butane to say 5x, the calculation is as follows:

3/100 x (10+1.75) x 5 = 1.76mL of butane

Had we not considered the pump dead volume, the result would have been 1.5mL of fuel, an error of 15% which would most likely prevent ignition. If it were a 100mL chamber on the other hand, the error would have been of 1.5%, and likely the mix would have still ignited.

After the fuel is injected, all you have to do is pressurise with your pump to the following pressure (assuming you're using psi):

(mix number - 1) x 14.7

In the case of our 5x mix, the calculation is as follows:

(5-1) x 14.7 = 59 psi

If your gauge can read bar, simply pressurise to (mix number - 1) bar, so 4 bar in this case.