Yes, the fuel pump may be the issue. The fuel pump and level sending units are replaced as a single componet.
Before replacing your fuel module asmebly check your fuel pressure. If you have a 4.8L, 5.3L, 6.0L or 8.1L your fuell pressure should be 55 - 62 psi with the key on - engine off. If you have a 5.0L or 5.7L the key on - engine off pressure should be 60 - 66 psi. With the gage still attached the pressure should only drop about 5 pounds or so once the key is shut off. If the pressure contiinues to bleed off, check for leaks in the gage, gage connection or fuel lines. IF no external leaks are found, the fuel pressure is bleeding back though the pump and is a symptom of a failing fuel pump.
The noise from the fuel pump also indicates that it may be failing, but some GM fuel pumps can be very nioisey.
Adding fuel when the tank is almost empty may temporarily improve the pump performance. With in the tank pumps the fuel lubricates and cools the pump. If the pump is failing it will heat up, adding the fuel would help cool thepump and make it work a little better for a short time.
All that said, first check fuel pressure to be sure it is correct and holding the presssure.
Let me know what you find and I'll do my best to help.
Tuesday, June 23rd, 2020 AT 5:36 PM