I replaced the fuel filter installed correctly, fuel modulator, fuel regulator and fuel pump relay.
Are any of the lights on our dash on??? It might not be your fuel pump.... It may be your security system failing.. Check out this site... your car is on it year make and model for this problem.. It happened to my impala. It would turn over but not start sometimes. Its really common in gm cars! Read up on it an see if this may be it. I hope this helps ya Do It Yourself GM Security bypass
But did you actually test fuel pressure at key on? If not, how do you know the pump is working fine? Just because it runs, does not mean it is ok.
Testimonial: "I disconnected the fuel filter and turned the key to see if fuel was coming out and it was."
Not good enough. On fuel injection engines you need BOTH correct volume, AND correct pressure. Many parts stores will loan test gauge kits. This is a common problem, and incorrect (low) pressure can be bad pump, bad regulator or even bad relay or filter.
As David said it needs testing with a gauge and a closed system with pressure built up.The volume and pressure both will let you know for sure.
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Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they just stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.
It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.
If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.
Have you hooked a scanner to the computer and checked the oxygen sensor(s)? If they are bad they could lean out the engine.
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