Fuel pump relay ($11.44):
http://www.rockauto.com/catalog/more...027&cc=1061536
Or possibly the oil pressure sender ($29.79):
http://www.rockauto.com/catalog/more...762&cc=1061536
I'm going through the same thing but the opposite! My fuel pump won't turn off! I turn the truck off, pull the key out, lock it. Come back an hour later and can still hear my fuel pump running!
So, there are two items that could control it. Fuel pump relay on the firewall in the engine compartment and then the Oil pressure sender (to Gauge). Apparently, the oil pressure sender also tells the pump to stay on if the fuel relay fails. I think if it reads over 4 or 6 psi, it kicks the pump on.
So, this is what I'm hoping will fix mine. I unplugged my fuel relay but still stayed on so my last resort is the oil pressure. I'll let you know if it works out for me!
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires
04' GMC Yukon XL, 3/4 ton, 8.1L