The purpose of this paper is to investigate the existence of weak solutions for a perturbed nonlinear elliptic equation driven by the fractional p-Laplacian operator as follows:where λ is a real parameter, (− ) s p is the fractional p-Laplacian operator with 0 < s < 1 < p < ∞, p < r < min{q, p * s } and V , a, b : R N → (0, ∞) are three positive weights. Using variational methods, we obtain nonexistence and multiplicity results for the above-mentioned equations depending on λ and according to the integrability properties of the ratio a q−p /b r−p . Our results extend the previous work of [5] to the fractional p-Laplacian setting. Furthermore, we weaken one of the conditions used in their paper. Hence the results of this paper are new even in the fractional Laplacian case.