Fuel Pump, or 02 sensors?????

[Fo_Mo_Co]

i have a 2000 mustang V6.
the check engine light came up, and of course went to check it at autozone and advance auto, and like most times the codes said that it was all of my o2 sensors..all four.

this is what the car does.
when im driving, and the engine reaches normal temp and after like 30 minutes of driving, the car starts to die on me. especially on the highway. i may be going 70 mph, and then the car starts to lose power and like if its needing fuel. pressing the gas pedal just makes the car shake, and stall, and eventually die.

After the engine had been running for a while, i tested the fuel pressure when the car was on, , the reading was 35-40 psi...but within five minutes of the car idling it starts going down to zero...and the car dies.

it has a new fuel filter. so wanna know if its the pump, the cps sensor, or the 02 sensors.
any advice?????

 

[cjones]

could be the fuel pump overheating or the relay or other electrical connection overheating.

what were the codes?? a cps sensor and O2 sensors would not cause fuel pressure to go to 0.

btw only the front sensors are used to control air/fuel ration. the rear sensors are for Catalyst Effiecency Testing (makes sure the cats are working)

 

[MustangLX-5.0]

If it is a relay,it will be located within the CCRM (Constant Control Relay Module).Its located within the passenger side fender behind the splash shield.When you move the splash shield,look to your right and you'll see a large wire harness going into a module that looks similar to a PCM unit,only it's black.You can't miss it.Has tons of wires coming out of it.I have never had to test one of these personally.I don't even know if the fuel relay within the module can be replaced individually or if the entire unit has to be replaced.However,this may not be your problem.You need to rule it out first.

After the car dies,will it start right away and stay running? Can you hear the fuel pump running?If you can,does it sound erratic or sound like it's running at a very low speed? Ignore that if you cannot hear it.

 

[sledge42hammer]

i dont think its your o2's, it would run like crap after about 3-5 minutes not 30. the codes you are reading are probably the rear for the cats, ive gone throiugh 2 sets on mine for just the rear. i dont think its your cps either cause if it were your tach would jump around and/or read 0 right before it starts to die. my .02