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I suspect you have a bad ground connection. It could be at the battery, at the engine, or elsewhere. You are correct, you should not read 12v on both sides of the fuel pump. One side should be at chassis/ground.
if its not getting any fuel, check the fuel pump relay. make sure you have spark also. to check for spark, put plug wire next to a metal part on engine then turn it over. if its firing you will see the spark jump from wire to ground on engine. Good-Day! Check all the fuses in the fuse relay box on the driver's side fender well. Replace any blown fuses and try starting the car. Good-Day!
First check the fuse for the fuel pump, listed in the manual and also on the lid to the fuse box. Then check for power going to the pump, if there is power and no pumping, then the pump needs replaced. The pump is located in the fuel tank and you will have to drop the tank to get to it. The come out easy and replace easy, just getting the tank dropped is the bear. No resets that I am aware of and I been doing this for quite a while now.
It is possible that when it rolled over a wire got torn loose on the underside of the truck and this could be the problem.
With ignition key on run, use test light to verify you have positive & ground to fuelpump. No power (positive) check fuelpump fuse. No ground check fuelpump relay. If both positive & ground fuelpump needs to be replaced.
A part called an Inertia sensor may have shut off power to your fuelpump. Check your owners manual for the location of this switch. It may be on the side of the trunk beneath the carpet or under a kickpanel by your feet. The part has a button which needs to be pushed to reset it. Hold the button for 2-3 seconds and you should be good.
The Inertia switch is a Fire safety switch for collisions and sometimes trips with a door slamming. If unsuccessful with starting listen for the fuelpump when you turn the Ignition key. If still no noise, then check your fuses or contact Autozone or Oreillys about a fuelpump relay or fuse.
Other component problems usually register in your onboard computer. You should see the "check engine" light on the dash. This would point to a problem other than the Inertia switch which does not give a warning.
If you hear the fuelpump operate the first 1 or 2 seconds when the key is turned to RUN position, the fuelpump is working. If you do not hear the fuelpump run, check the Inertia switch which should be in the side panel of the rear cargo area. If you have an owners manual check for the Inertia switch location.
To reset the Inertia switch, hold the button on it for 2-3 seconds. You should now hear the pump run. You may also have a fuelpump relay under the hood in one of the Powerboxes. The Powerbox may have a fusible link from the Battery. When the fusible link is OK and the Pump Relay is OK, there is a fuse in the Fuse panel. Then finally the Ignition switch will trip the Pump relay. As power flows through the wire to the fuelpump the Inertia switch can break the power connection.
So you have 5 powerpoints before the fuelpump will work. Fusible link, Pump Relay, Fuse Panel, Ignition Switch,and Inertia switch. These must all work before the fuelpump can run.
First check you are getting spark to plugs. If yes check for fuel. You can spray starting fluid in intake when you pull off intake rubber hose that sits on top of engine. If you start momentarily you have fuel problems. Turn key forward just where its left after you start. Listen for fuelpump to whine back by gas tank filler. If no noise most likely fuelpump. Always change fuel filter right after its install.
it may be your car key if you key got damage or you change your battery that can cause for the computer not recognizing your key. the is a ship on you car key this is call transponder key. and you are going to need a locksmith or Nissan dealership to reprogram the key on your car computer. here is a link to help you understand this click here and read all carefully.
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