replace fuel pump on 1997 Buick LeSabre

I replace the fuel pump but still a hissing noise in the rear by the fuel tank.but it not a air leak because the mechanic said that no leaks.it make the sound when it been running for a length of time causing the car to shut off.

Asked by for the 1997 Buick LeSabre
1 answer
You may have air suspension and it may have a leak, which is causing the hissing.