Stevef is talking some sense, you need to positively identify the noise. If the aircraft has been recently runing ok then the engine's own mechanical pump should sustain it once started. Obviously we assume there is fuel in the tanks and that it has been turned on!
It's been some time since I worked on a TB10, is it the retractable gear version? I say this because the hydraulic gear motor will sometimes run if the aircraft has been standing for a while or if the system has a leak or is low on fluid.
I also can't remember if the fuel pump was a rotary pump or a reciprocating type (Bendix type). The bendix type reciprocating pump makes a ticking sound, rapidly at first then just a tic, tic, tic, type noise when it is up to pressure. A rotating pump makes a whirring noise.
Can you also tell us what noise it used to make? The more detail you can give, the better chance of identifying the problem.