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For the most part its in the back in side the lift gate on the left or right side behind a small panel try this website to see if they have any information on your truck www.alldatadiy.com if you do not have an owner manual try this website to see if you can down load one for your truck its www.edmunds.com
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The pump is powered by the relay. The relay is grounded by the computer. It gets a ground signal for the first 3 seconds, then only if the computer sees oil pressure or RPM to know the engine is running. You should be able to ground the relay and run the pump for several minutes. After 30 seconds you should be at max pressure. Normal pressure is 15psi for a truck that has throttle body injectors such as a mid 80s model, and 65psi for trucks that have port fuel injection like yours. You may have the wrong pump.
Fuel pump or injector assembly. Need to know what the fuel pressure is before throwing a part at it. By what you are saying I'm leaning tword the fuel pump. Make sure the wires at the top of the sending unit are not burn. There is a small 4 wire connector on the inside of the sending unit. If it's burnt you will need to replace both the pump and sending unit.
MOST LIKELY THE FUEL PUMP HAS FAILED, WHEN U TURN THE KEY TO RUN POSITION DO U HEAR A HUMMING NOISE FROM THE FUEL TANK? THIS NOISE WILL STOP IN ABOUT 5 SECONDS, U CAN HEAR IT BETTER BY TAKING OFF THE GAS CAP AND LISTENING THERE, IF U HEAR NOTHING THEN THE PUMP WILL HAVE TO BE REPLACED.
I do not know the codes but have been told "vacuum leak"? Mechanic thought gas cap might be loose or the O ring in cap may be dry-negative. Hope this may help some.
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