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Have a 1996 Seville no start. Head pressure is good. Sat for a couple of years. Will start briefly with starting fluid. New battery. Tries to turn over with a very slow crank. Reset the psu and tried and rest k just in case. No dummy light. When you try and start it the security light does go off. Help? I seem to know more about my car than the dealership here and they admit it
 

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White Diamond '03 DHS (with DTS floor shift)
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What is "head pressure"?
What is a "PSU"?
What is a "K"?

Will start briefly with starting fluid.
That sounds like low or no fuel pressure. Borrow a fuel pressure tester from a parts store with a loan-a-tool program and check your fuel pressure. It should be in the 40 - 45 psi range.
 

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1996 Eldorado etc
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yes, sounds like low fuel pressure. cut an access hole below the back seat to access the pump. New pump should be about $50 on amazon. Use an air nibble to cut the hole.
 
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