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the relay is located on the upper firewall on the drivers side in the rack of 2 relays. One is for the air cond if equiped with one and the outer should be the fuel pump relay. Be sure to check the relay with a voltmeter set at 20 volt dc scale , the reading should indicate voltage thru the relay or none which should tell you if a new one is needed. May want to be sure you have a good ground on the frame near the pump assembly unit as it will make you think the pump is bad but realy at times you loose the ground due to bad rust. old rusty wrench,,Rives Jct., Mi.

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15y ago
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Q: Where is the fuel pump relay on a 1991 GMC Sonoma 4.3?
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