Question about 2001 Nissan Altima

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2001 Nissan Altima fuel pump is not receiving electrical power?

I've checked the fuel pump, battery, fuse, and relay. All work fine, but the fuel pumps is still not receiving power to turn it on and pump when installed. I thought initiallly that my alarm is shuting down the fuel pump. I've reset my alarm, but it still will not start up? The fuel filter is 6 months old and the car has worked fine up through last wednesday. What is the solution?

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  • Anonymous Mar 23, 2014

    The car doesn't have the rollover switch in the trunk ,i was also wondering if there;s another shutoff of somekind im may be missing?

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  • Nissan Master
  • 22,326 Answers

Factory imobilliser has cut in by the sound of it ,you will have no spark as well at the plugs if iam right

Posted on Aug 12, 2009

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Posted on Jan 02, 2017

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Microbus 2.3i four speed fuel pump not getting power


The click you hear is probably the fuel pump relay. See if you can locate it by sound. Possibly, the power feed for the pump may not be good at the relay. Pull the relay out and check for a power signal at one of the terminals that the relay plugs into. It should be a hot- at-all-times signal, so the key does not need to be on. The power feed will come from a maxi fuse in the power distribution box, or from a fusible link just off the battery. If the power is good, try another relay. If still no pump, check the wire from the relay to the pump for a short-a broken line. If wire is good, check the ground for the fuel pump.
Go back to your checking for power at the pump: just possibly, you missed the signal with the key on, because with key on the pump is only supposed to turn on for about 2 seconds (to pressurize the lines) and then shut off until the engine is cranked or running. Try testing for power again at the tank with the key held in start-should be a steady signal then, as long as the engine is cranking over. If still nothing, back to the relay. If you now have a signal for the pump when cranking engine, it must be the fuel pump ground.

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1 Answer

I have a 03 Hyundai accent I just replaced the fuel pump I have no power to the fuel pump I've checked the fuses and the fuel pump relay it won't start I'm not sure what to do next


Do you have a test light? If not, go buy a cheap $5 test light-one with a lead to clip to a ground, and with a needle type probe.
Pull the fuel pump relay out of the terminals it is plugged into-you need to check if the power feed for the pump is still available at the relay. Clip the test light lead to a ground and touch the test probe to the positive battery post-to check that your ground is good- tester should light up. Now touch the probe to all of the terminals that the relay plugs into. One terminal should have power with key off. If no terminals have power, you have lost the power feed for the pump. Double check all your maxi fuses in the power distribution box. Either a maxi fuse or a fusible link will be the power feed for the fuel pump relay.
If the power feed is there at the relay, try a new relay. If still no pump, a shop will probably have to check your fuel pump circuit.
Did you check for power at the fuel tank while the key was held in crank? When the engine is cranking, the fuel pump wire should have power. When the key is turned to on, the fuel pump should have power for about 2 seconds, to pressurize the fuel system. Then when key is turned to crank or start, the fuel pump should stay on.

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2 Answers

Electrical prblem


There would be a fuel pump fuse, either under dash or under hood. Check that fuse, use the test light to see if fuse has power. If not, then it might be a fusible link or maxi-fuse that feeds the fuse panel. If fuse has power with key on, pull the relay, and use the test light and probe relay terminals, key off. One terminal should be hot at all times. If not, check for power loss between battery and relay terminal-possibly a maxi-fuse or fuse link.
If relay does have power to terminal, quickly check other terminals while someone turns key to on-for about 2 seconds, another terminal should show power-this would be signal from computer to turn the relay on to prime the lines and fuel rail. If you have that, plug relay in and cycle key. Does relay click? If yes, relay is working and problem may be at fuel pump connector. If relay is not working, but you have power to it, and the short signal from computer is there, then check the relay's coil side ground. Computer signals the coil side and the signal goes to ground from relay coil side.
Pull the relay and use a jumper wire from relay's hot terminal to fuel pump terminal-the wire to pump from the relay. If pump comes on, the problem is right there at the relay-either no signal from computer or the relay coil's ground is lost. If pump does not come on, again check connector at pump-that or the wire to pump[ has a problem.

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Im trying to find a wiring schematic for my 1990 nissan mainly fuel pump relay to the fuel pump to the fuse under the dash


The fuel pump relay is powered by a 10amp fuse.
The computer relay is powered by a fuseable link connected to the battery.
You might want to check the lines coming from the battery and starter for open circuits.

Wiring diagram courtesy of autozone.com

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1 Answer

Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

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1 Answer

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the fuel pump is toast, use a volt meter or test light to check for power at pump, if receiving power then pump is faulted, if not receiving power follow wire testing at every connection until you find power. once you find power you will most likely find part at fault if not pump

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