When I let the car sit it will not start. 1991 accord see. I've changed the relay but too no avail. I give it a. Shot starting fluid and starts right up. What do I do

 

You've proved that fault lies w/ fuel delivery (main fuel relay, fuel pump, fuel filter, or injectors.

Suggest confirming that 12V is getting to the fuel pump. When ignition switch is turned to On, 12v should appear at connector (yellow wire) for 3 secs and then stop. If you find 12V on the connector in the trunk, then a faulty fuel pump is likely.

If you don't find 12V on yellow wire, then main fuel relay or wiring fault.

good luck