POOR COCKPIT PREFLTS BY B737 FLT CREW RESULT IN PRESSURIZATION LOSS AND FUEL CONFIGN OUT OF LIMITS DUE TO XFEED LEFT OPEN.

Narrative

I WAS PF DEPARTING OAK. PASSING 10000 FT WHEN THE CABIN ALT WARNING HORN WENT OFF. I LOOKED AT THE CABIN ALT AND SAW THAT IT WAS THE SAME AS OUR ACFT ALT. I WAS HAND FLYING; SO I ATTEMPTED TO LEVEL OFF AND LOOK AT THE PRESSURIZATION PANEL. WHEN I LOOKED AT THE PANEL; EVERYTHING LOOKED NORMAL. I EVENTUALLY ENGAGED THE AUTOPLT AND BEGAN TO ANALYZE THE PROB. THE PRESSURE DID NOT STABILIZE; SO I DIRECTED THE FO TO DON HIS MASK AND I DONNED MINE. I WAS A BIT CONFUSED BECAUSE EVERYTHING LOOKED RIGHT BUT THE CABIN WAS STILL AT 10000 FT. TO MAKE MATTERS WORSE; I COULDN'T FIND THE WARNING HORN CUTOUT SWITCH. I FINALLY FOUND IT AND SILENCED THE HORN. WE THEN RAN THE CHKLIST. AFTER RUNNING THE CHKLIST; THE FO TOLD ME HE HAD LEFT THE MODE SELECTOR SWITCH IN MANUAL DURING HIS PREFLT (WHICH I MISSED ALSO) AND THAT HE HAD RETURNED IT TO NORMAL WHILE I LEVELED THE ACFT. WE PLACED THE SWITCH TO 'ALT' THEN NORMAL AND THE CABIN FINALLY CAME DOWN. WE CONTINUED ON. THAT IS WHEN I NOTICED THE AMBER CONFIGN LIGHTS ON THE L MAIN FUEL GAUGE. I LOOKED UP AT THE FUEL PANEL TO FIND THAT I HAD LEFT THE XFEED OPEN DURING MY PREFLT. I BALANCED THE FUEL AND WE CONTINUED THE TRIP UNEVENTFULLY (BELIEVE IT OR NOT). I HAD A SHORT NIGHT THE NIGHT BEFORE BECAUSE I WAS ON RESERVE AND HAD TO BE IN OAK EARLY. I WAS ABLE TO GET A 2 HR NAP BEFORE THE FLT; SO I DID FEEL REFRESHED. I HAD BEEN OFF FOR ABOUT 1 WK BEFORE THE FLT; BUT DIDN'T FEEL RUSTY. MY FO WAS IN HIS FIRST FULL MONTH; BUT SEEMED TO BE DOING OK. WE PUSHED ABOUT 25 MINS LATE DUE TO THE LATE ARR OF THE ACFT; BUT I DIDN'T FEEL RUSHED. SO; I HAVE NO REAL EXCUSE FOR THE MISTAKES OTHER THAN LACK OF ATTN TO DETAIL.