Vehicle worked after starter replaced. Checked battery , tighten connections. Switched fuel relay with horn relay. Hear pump when key turned on. Strong from starter, but won't start.
Check to see if your "security" light is on. The VATS will disable the starter and fuel if it detects a mismatched key in the ignition, even though it's the proper key. The cylinder contacts will wear out after a few thousand times inserting the key.
Some cars wont start if there is no fuel pressure.
Check if you're getting fuel to the fuel rail.
Check the alternator. It is likely not working to charge your battery as your car operates. Your battery can sustain a momentary rush of current even when it is low, so this explains why you get a turn-over of the engine shaft. But as it drains quickly and needs a boost. It can also be cabling as well, but check that your battery is getting more voltage as the car operates (that is, after someone gives you a boost to start your car).
New alternator and battery. Battery strong. Turns over but won't start
IS the turn-over strong? Does the charge seem to fade as the starting continues? If still strong, then you likely have engine ignition issues which can be a variety of problems like no or poor sparking, or no gas pumping, bad mixture, etc.
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