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I assume the pump was replaced because it was getting power but no fuel pressure ? Are you still not getting fuel pressure ? Spark to the plugs ? Normal compression when cranking the engine ? Security light not staying on ?
installed new fuel pump and filter in 97 cavalier 2.2 the car will run for a couple seconds and shut off if you spary it with starting fluid it will stay running
If the engine fires up for a second or two with starting fluid then the fuel pump is weak.I would check the fuel pressure and if its not within the specs then replace the pump and filter.
You need to figure out what you are missing. What is the fuel pressure at the rail when you are cranking the engine? It needs to be above 40PSI. If you have sufficient fuel pressure you need to check for spark at the plugs while cranking. If you verify you have sufficient fuel and spark then you need to look to timing and compression. These are the four things an engine need to run. Fuel, spark, compression, and timing.
It won't die when pulling the relay because it has another power path to the fuel pump through the oil pressure switch . Fuel Pump Electrical Circuits Description and Operation watch this video on fuel pump control , shows chrysler first , ford ,then gm . wait for gm an he explains the oil pressure switch . Plus when it won't start ,don't guess or theorize ! Test what's missing ? check for spark , no spark check ignition system , coil's , ignition module , crank sensor etc... has spark ,do a fuel pressure test etc... don't think computer , when it won't start does the check engine light come on with the key on run not start . If light is lit ,nothing wrong with the cumputer . If want to fix cars you really should take some automotive classes . Test don't guess .Watch some other videos crank no start videos etc...
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