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Summary: The ink cartridge for the HP PSC 1315XI printer is the HP 27, which can be refilled with 20 milliliters of ink that are depressed into the cartridge slowly. Replace the sticker after refilling the ink cartridge with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi this is Taylor here talking about HP printers and cartridges. Today we are going to discuss how to refill ink cartridges for the HP PSC 1315XI. To refill the black cartridge which is an HP 27, simply peel back the sticker, you do not need to remove it all the way, but just peel it back until you expose one to two of the openings. After peeling the sticker back, fill up the syringe with about 20 milliliters of ink, stick into the top opening, and depress slowly. Be careful not to do it too quickly as you can make a mess. Next we are going to show how to refill the HP 28 cartridge for this printer. The HP 28 cartridge is their tri-color. To fill it up, simply remove the label from HP revealing the holes. Once you have that, each one you can see the sponge. Get a needle full of the ink. The top one is the magenta, these two over here are for the yellow, and these two are for the cyan. Each one will take five milliliters of ink. After you have filled with five milliliters each, clean, place the sticker back on top, and reinsert back into the printer."
eHow Article: How to Refill the Ink Cartridge for HP PSC 1315XI