Depends on how much external air could get in.
50 liters of fuel, assuming the same density as water, would be 0.05 cubic meters of air. At sea level with standard pressure 1 cubic meter of air saturated at 100% capacity will contain 17.3 grams of water at 20c and 7.84g at 8c. Assuming your fuel changes temperature at the same rate and that no water evaporates from the fuel you could get about 9.5g per cycle. Assume again that the outside humidity is 100% and your dry air (after condensing) in the tank gets completely replaced each daily cycle.
30*10g = 300g or 300ml of water. In reality this won't happen, it won't even come close. If your vent line is long, your daily temp cycle won't even exchange any significant amount of air with the outside, which means you might have one condensation cycle but no more water after the first 10ml (in 50l) get condensated. That is less than the amount of water naturally dissolved in diesel.
In reality your fuel temp might change 5c and that would be only 5g water.
50 liters of fuel, assuming the same density as water, would be 0.05 cubic meters of air. At sea level with standard pressure 1 cubic meter of air saturated at 100% capacity will contain 17.3 grams of water at 20c and 7.84g at 8c. Assuming your fuel changes temperature at the same rate and that no water evaporates from the fuel you could get about 9.5g per cycle. Assume again that the outside humidity is 100% and your dry air (after condensing) in the tank gets completely replaced each daily cycle.
30*10g = 300g or 300ml of water. In reality this won't happen, it won't even come close. If your vent line is long, your daily temp cycle won't even exchange any significant amount of air with the outside, which means you might have one condensation cycle but no more water after the first 10ml (in 50l) get condensated. That is less than the amount of water naturally dissolved in diesel.
In reality your fuel temp might change 5c and that would be only 5g water.
