  Observations by Fermi LAT enabled us to explore the population of
non-recycled gamma-ray pulsars with the set of 89 objects. It was recently
noted that there are apparent differences in properties of radio-quiet and
radio-loud subsets. In particular, average observed radio-loud pulsar is
younger than radio-quiet one and is located at smaller galactic latitude. Even
so, the analysis based on the full list of pulsars may suffer from selection
effects. Namely, most of radio-loud pulsars are first discovered in the
radio-band, while radio-quiet ones are found using the gamma-ray data. In this
work we perform a blind search for gamma-ray pulsars using the Fermi LAT data
alone using all point sources from 3FGL catalog as the candidates. Unlike
preceding blind search, the present catalog is constructed with novel
semi-coherent method and covers the full range of characteristic ages down to 1
kyr. The search resulted in the catalog of 40 non-recycled pulsars, 26 of which
are radio-quiet. There are no statistically significant differences in age and
galactic latitude distributions for the radio-loud and radio-quiet pulsars,
while the rotation period distributions are marginally different with
$2.4\sigma$ pre-trial statistical significance. The fraction of radio-quiet
pulsars is estimated as $\epsilon_{RQ}=63\pm 8\%$. The results are in agreement
with the predictions of the outer magnitosphere models, while the Polar cap
models are disfavored.
