96 Bonneville w 3.8 engine Engine quit, no fuel pressure, at the
Engine quit, no fuel pressure, at the same time the power door locks, power windows and power seat all quit. Engine cranks good, cleaned battery terminals, (was okay anyway). Cleaned ground wires on each fender. I have had a related problem for some time. Until now the unit would start at a later date. Now nothing
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Depending how often that happened and how long it runs it is a normal behavior. Modern cars use computer to read the pressure in the fuel system. When pressure is low computer start the pump for maintaining the optimal fuel pressure for an easy start of the engine. For example I own a VW from 2003 and fuel pump starts running for a couple of seconds when I first open the driver door after a long period of time (2-3 hours). If fuel pump runs very often or for more than 5 seconds could be for 2 reasons: 1- fuel leaks (could be minor but loose the fuel system pressure) . 2- the fuel pump is no longer in best shape and make no more the optimal pressure, but in this case you will have also engine lacks of power and other engine problems like hard starts when engine is cold. So if your fuel pump starts from time to time for 2 or 3 seconds you don`t have to worry about
What you are telling me is the engine is firing the plugs but not getting fuel. When you changed the fuel pump and filter, did you check the fuel pressure at the rail ? Are the injectors getting power and ground pulse ??
Do this test first. With the drivers door opened in a nice quite area turn the ignition key to the ON position without starting the engine. You should hear the fuel pump operating for 5 seconds which is priming fuel to the engine. If not heard the engines oil pressure sensor is at fault. The third wire from this sensor links to the fuel pump to prime. When the engine reaches normal operation oil pressure range the computer shuts off that circuit and turns on the fuel pump relay for the pump to run. That relay stays on until you shut the engine off
This is a typical GM problem, most likely are broken wires on the driver's side door. Every time the door is opened and closed, the wires running from the door to the car body flex. Over time these wires break and cause loss of use for power options like you have. It could just be coincidental that they broke in a rain. There could be other electrical problems such as relays that have become wet and failed or a wide variety of other solutions. Electrical problems never have only one answer
After checking fuses your only sure hope is replacing the BCM module in the passenger compartment. (Body Control Module) . It runs all the electrical systems...basicly its the engine computers counterpart. Unfortunately mine cost 500 bucks, but it restored all the funky systems that were not functioning. ...cski