I’m gonna put all the details that I can in here to see if I can get some ideas. So, my sons O2 LeSabre suddenly stopped running a short distance after he left the neighborhood. It had been running fine before this point with no warning lights. He turned left out of the neighborhood and he said he heard his toolbox sliding around in the back of his car and then the car died. Took it home and put some starter fluid into the air intake in the car started right up for a few seconds.

This made me think that the issue was the fuel pump as this was supposedly a common problem with this model car. So he ordered and replaced the fuel pump with an exact fit high-end model, started the car and it started right up. Let it run for a short while then shut it off. I told him to drive around for a while to make sure the battery get recharged so he started it again, exited the neighborhood and the car stalled at the same exact place, after he turned left.

Now he stated once again he heard his toolbox slide and hit inside his truck, there’s no way it could’ve hit the fuel pump itself as that is down underneath the floor of the truck. I looked is the wiring and I did not see any grouting points that could be any relation to it. Check the fuel pump fuse underneath the backseat of the car it was fine. When you turn the key to start can hear the clicking of the relay for the fuel pump, even changed it out with another relay for something nonessential and still no start. The car turns over but does not start. Even tried jumpers to make sure there was enough power and still turnover but no start.

Replace the fuel filter, still no start. So got a fuel pressure gauge and put it at the fuel rail shraeder valve and got zero pressure. Since the car started before and had run, we then jumped to the idea that maybe we got a defective fuel pump when we replaced it since it worked for a short time then had died, so we took it back and got a new one and put it in, Car will turn over, but still no start. Re-checked all the fuses underneath the seat and in the engine compartment, make sure that the relays were in the proper position and alignment. Tested once again with starter fluid into the air intake and again it ran for a short period.

I’ve got to think that it’s an issue of the fuel pump not energizing. We even took the cover plate off so we could listen to the fuel pump and could not hear it energizing when the key was put into the on or accessory position. Our next step is going to be with a multimeter to check to see if we’re getting the voltage at the fuel pump, but if it’s not I’m kind of stuck of where to go to look to find out where it’s not getting energy from. I’m assuming I should start at the fuse box under the seat where the fuel pump relay and the fuel pump fuse are located.

Anyone have a diagram of the electrical wiring for the fuel pump? Does it run in the walls of the trunk? Somewhere that the toolbox that I mentioned earlier hitting the wall could have damaged or caused a break? Any ideas would be helpful.