A direct metering fuel supply system includes a fuel pump, a burn flow fuel line, a servo flow fuel line, and a servo regulator. In one embodiment, an image may be presented to the patient to obtain the patient’s subjective perception of the image, and the patient may either manipulate the image to obtain a desired adjustment, or guide a clinician performing the adjustment. In addition, a randomly generated overlay frequency is used to modify the speech signal to further prevent an IVR system from recognizing the TTS output. The separator for batteries of the present invention comprises a first porous layer containing a thermoplastic resin as a main component and a second porous layer laminated on the first porous layer, which has higher heat resistance than that of the first porous layer.