However I doubt they are fuel proof, but if you isolate the fuel so only vapor makes it to the sensor, you might make it work. a length of hose, and vertical placement could let you get by for a while.
That doesn't work. When measuring liquid pressures there must be no vapour pocket anywhere in the sensing lead as liquids are incompressible and will transfer their applied pressure to the sensor element. Vapour is compressible so will not accurately transfer the applied pressure to the sensor. Liquids and gasses cannot be allowed to mix in the sample line to the sensor as it will cause large errors in measurement values.
Pressure sensors designed for 'hostile' liquid service typical have a stainless steel metallic barrier between the sensor pressure element and the 'process' attachment. Then there is an inert liquid packed between the barrier and the sensor element so that there is no trapped vapour space, so the pressure will transfer accurately.
A installation rule for pressure sensors is:
If for air/gas/vapour only service, mount pressure sensor higher then pressure sample take off point so any condensation will self-drain back to into the process being measured.
If for liquid pressure service, mount pressure sensor lower then pressure sample take off point so any trapped gas partials will travel up and back into the process.
Failure to follow either of these 'rules' can lead to inaccurate and unstable pressure readings.
Lefty