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@Gordon
In terms of 3.3v power supplies, I can't really recommend anything - it'd just be a matter of checking datasheets.
However, with 270 Ohm things would be much better - you wouldn't get full swing on the ADC input, but it's accurate enough that you'd still get a pretty good fuel level reading. I guess each sensor might draw 10mA, so you have loads of room on the Pico's 250mA voltage regulator.
It means you can use the Pico's voltage regulator, so you can feed it with higher voltages - 5 to 12 volts might be a good start. You could use a totally standard voltage regulator. For instance ST's L78S05CV looks like it'll take up to 35V in and give you 5v out, so would do you fine.