Nextal, my fuel relay went out on me like you are takling about. pop the hood thump it and crank it back up. Of course sometimes it wouldnt crank back when i thumped it. I called the tow truck. when he got there about 2 hours later, he told me to try it again for grins. I did and it cranked. It didnt make mine buck and jump, it would just die. but the six port fuel diverter valve thingamajig did make it buck.