Enriched isotopic abundance ratios of 30 Si/ 28 Si in several presolar SiC and graphite grains qualitatively indicate massive oxygen-neon (ONe) nova origins but fall short of hydrodynamic ONe nova model ejecta predictions by as much as an order of magnitude. The astrophysical 30 P(p, γ ) 31 S reaction rate uncertainty at ONe nova temperatures (0.10 < T < 0.35 GK) spans several orders of magnitude through which the predicted amount of ejected 30 Si can vary by a factor of 100. By measuring triton momenta from the 31 P( 3 He,t) 31 S reaction at 20 MeV, the energies of 30 P +p resonances in the Gamow window for ONe novae have been determined to better than ±3 keV, and two new resonances at E c.m. = 194.0(25) and 266.4(27) keV that likely dominate the 30 P(p, γ ) 31 S rate for 0.08 < T < 0.25 GK have been resolved. A resulting increase in the experimentally determined 30 P(p, γ ) 31 S reaction rate puts it in accord with Hauser-Feshbach statistical model estimates for 0.08 < T < 0.40 GK, supporting conclusions drawn from ONe nova model studies that employed a Hauser-Feshbach rate.