ATX PLT FAILED TO HOLD SHORT AS INSTRUCTED AND CROSSED AN ACTIVE RWY DURING REPOSITIONING FOR FUEL.

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I WAS REPOSITIONING MY ACFT FROM THE COMMUTER RAMP; AT FT LAUDERDALE/HOLLYWOOD INTL ARPT; TO FBO FOR REFUELING. I WAS CLRED BY GND TO HOLD SHORT OF RWY 27R AT TXWY Q. WHILE TAXIING I WAS INSTRUCTED TO EXPEDITE MY TAXIING FOR INBOUND B737 THAT WOULD BE TAXIING OFF RWY 31/13 ONTO MY TXWY. AS I TURNED ONTO TXWY Q I STARTED LOOKING FOR THE HOLD SHORT LINES. I WAS WATCHING A B727 ROLLOUT ON RWY 27R TO THE END. THE RWY AND TXWY LIGHTS WERE NOT ON YET. I ALSO NOTICED ANOTHER PLANE TAXIING INTO POS ON RWY 27R. I STILL HAD NOT FOUND OR SEEN THE HOLD SHORT LINE; WHEN I NOTICED I WAS ON THE RWY SO I CONTINUED ACROSS AND CONTACTED GND AND TOLD THEM WHERE I WAS. THEY SAID THEY WERE WATCHING ME AND INSTRUCTED ME TO CONTINUE TO FBO. I FEEL VERY BAD ABOUT XING THE RWY. I HAD FLOWN 7.2 HRS FLT TIME AND HAD BEEN UP SINCE XX00 AM. I FEEL THAT THIS COULD HAVE BEEN AVOIDED IF THE LIGHTS HAD BEEN ON. I ALSO BELIEVE THERE IS A PROB WITH THE PAINTED LINES AT THE ARPT. THE SURFACE OF THE RWYS AND TXWYS IS LIGHT GREY. THE HOLD SHORT LINES AT TXWY Q HAVE BEEN MOVED; PAINTED BLACK AND THE YELLOW OVER THE BLACK. THEY ARE HARD TO SEE DURING THE DAYTIME AND ARE IMPOSSIBLE TO SEE AT NIGHT WITHOUT THE ARPT LIGHTING. I HOPE THEY ARE REPAINTED BEFORE AN ACCIDENT OCCURS.