alright so i just put a new fuel pump and fuel filter on this truck i just bought its a 1994 gmc jimmy 4x4 i know this is a blazer forum but hey its the same truck as a blazer so anyhow the fuel pump should be heard for a few seconds when you first turn the key right well i dont hear squat so i went to the plug by the gas tank were there is a gray wire and a purple wire i have power on the purple wire but none on the gray wire which i was told the gray wire is the fuel pump so what should i check now and were is the fuel pump relay on this truck

 

They fuel pump relay is under the hood. Open the hood and above the brake booster on the fire wall are 2 small square relays side by side. I believe the one on the outside is the relay for the fuel pump, the other is for your horn.