91 oldsmobile custom cruiser will not start, did test and we get spark. The fuel pump continuously run when key is turned. Have replaced fuel pump relay. Next suggestion was to replace ecm fuse - but can not find it?

The bigger question here is whether or not the fuel pump is delivering fuel when it runs. Fuel pumps work on pressure. Once the pressure builds up in the fuel lines it will shut off until the pressure drops, then it turns on again. The fact that your pump doesn't turn off suggests that either it's not pumping any fuel out of the tank or it's not building any pressure. First thing to do is make sure there is fuel in the tank. It's possible your fuel guage has stopped working and is giving a false reading.Start looking for gas leaking under the car. A leak that let's the pump run continuously should leave a very visible wet spot. Look at the top of the tank as best you can too. Loosen the fuel line at the throttle body and see if you have pressure there. Maybe it's pouring fuel into the engine and creating a flooding condition. The fact that it runs continuously would suggest the problem isn't the filter. If the filter was plugged it would build pressure. If you can't find anything here I think you are going to have to drop the tank and start looking in there to see why it isn't picking up fuel, possibly replacing the pump. Hope this helps.