I have an 89 camaro rs and the power seems to be draining fast. I put in a new battery but the guage is still at 8 when i turn it on

Check earth point going from the battery to the chassis for a lose or corroded connection, also some cars have a fuse relay right before the positive clamp on the battery. if your headlights turn on when the car is off than it may be a ignition wiring problem. also check the plugs on your ecu.

check the battery have it checked akso your starter

Most likely it would be the tank sender unit,but it could also be the dash gauge and or possible wiring. When u turn off the key , does the gauge go to a different position ? If so, then probably the tank sender, if not then the dash gage.

I have the same problem, it seems related to the security system, maybe your key chip died, some times disconectin g the battery for some 10 minutes solves the problem

i would try checking my ground cables.try looking up the codes.this can be done for free at the local autozone or someplace like them.
i would also check the alternator/voltage regulator and there grounds.

if battery and conectors are very clean and tight,check for bad ground to engine from battery,,also fusable links off of starter or positive small post near fuses, important,,,is the alternator charging ? and have u tried a new battery? voltage should read 13.50 to 14.25 while running 12.5 to 12.65 when not running

Definitely you can save by buying used. Check for local auto dismantlers in your area. Be sure to ask them what kind of mileage the car had on it when they pulled the tranny. Also replace filter and pan gasket while it's out.

are your battery post bolts clean and tight, my 89 rs ran fine untill i decided i wanted shiny new battery bolts, when i put them in and tightened them down my car had no power at all, i checked how tight they were, and they were TIGHT so i wiggled the black cable and re tightened it and bam my lights turned on, tryied starting it, and it started, sometimes you just gotta make sure the connection is really good, not just how tight it is, also check your ground wires, there are a few but the main 2 are located at the front pass side next to the batt, and on the back firewall going from the bottom pass head to the firewall, hope that helps, if not comment back

So found the problem it was the seilnoid on the wasnt working properly store said good put it back hit with small hammer fired up so just replaced whole strarter now fires first time sounds awesome had lot of trouble tracking it down went threw new battery's thinking that was prOblem but was bad starter unit try this maybe will help u to

most likelly you fuel pump relay stuck close try to replace it,
and also look for posible bypass circuit installed to run fuel pump all the time, if you bought the car with the problem may be some one by paaseed but if not the replace the fuel relay