This work presents the construction and evaluation of a membraneless nanofluidic fuel cell made with fiberglass using flow-through porous electrodes based on Toray paper, coupled with a microelectronic interface to supply energy to low-power demand applications. The device performance is optimized for different operating conditions related with flow rate, stoichiometry and concentration and employing formic acid as fuel. Evaluation tests were performed with a homemade testing station using a commercial varying resistance.