Where are vaccuum lines on1999 chevy malibu 2.4L

First of all, the new fuel pump may be bad. disconnect line at fuel filter where it goes through filter. and see if fuel flows, or have someone to put hand flat on bottom of tank and try to start car. if fuel pump is working you will feel a vibration on tank. if it does not work, check the fuel pump fuse in fuse box before you exchange it.and or the fuel pump relay! when car is running it runs constantly, when you simply turn key to on position, it runs for about 3 seconds(until fuel pressure in line comes up. and then cycles off.

Yes the check valve holds vac in the booster.
Not sure about the line you replaced.

messed up a brake line somewhere under the car, check to make sure you have brake fluid

Need to replace the sensor inside the gas tank. I have a 2008 Malibu with the same problem. It was a faulty fuel gauge sensor.

It may take 3-4 times cranking for a few seconds,
with a 5 second pause between to get fuel up to the engine. Also may have sucked up
some dirt/debris into the fuel pump after running it dry. May want to change fuel filter.
you can try to have someone bang on the bottom of the tank while someone else
cranks engine. Sometimes this will free up a stuck fuel pump. good-day!!

after you put about 2-3 gal. of gas back in tank you should turn key on for about 4-5 seconds then off then try it again to get the gas back in the line.
if it don't start after trying that it could be you burned up the fuel pump in the tank.
when you first try this have someone listen for the pump to run at the tank.
take off the gas cap and listen from there.
when you first turn on the key it should run for a couple seconds.

It's located in the gas tank and to replace it, your going to have to drop the gas tank.
Thank you for using fixya and if you are going to replace the fuel pump your self. Make sure you also replace the wire harness from the frame to the fuel pump.

You probably have a large vacuum leak. With the engine running, listen under the hood for a hissing sound. Check all of the rubber lines running from the intake.

if it got the 3.4 in it it a walk in the park. take the belt off 4 pully bolts then 5 water pump bolts clean off old gasket then reinstell. look at water pump real good it only goes on 1 way. good luck. o brake the pully bolt loose before you take the belt off.and youll need a small pan to drain anti freeze it

Not sure but I wanted to let you know 99 malibu has a recall for the fuel pump. It leaks.