My 2000 infiniti qx4 replaced the fuel pump lots of pressure pump is working when you drive it down the road 3 or 4 kilometers it dies.Getting code 1490 can you help diagnose the issue

run the fault codes and check for broken timing belt( cam shaft not turning)

The fuel pump is located inside the fuel tank and is accessed through an access cover behind the rear seat.

have the fault codes read to determine the faulty sensor.

check the fuses. they are under the back seat just pull up on the lower part of the back seat and it will come out. fuse box is on the drivers side. check to see if water is getting in that could be the cause.

Was the cam sensor tested & was it found to be bad?

Was the fuel pump checked out or fuel pressure checked?

Always learn how things work & how to test them

Replace nothing until something fails

No guessing at all,diagnostic testing, if you like
that langauge

Failed Fuel Pump--my guess

switch the relay with another (abs, horn relay) to see if it gets the fuel pump going-if not, fuel pump time.

u might need to change the fuel pressure pump on ur infiniti.

There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark. Also run a scan on the car.

Good luck and rate this solution, please.

Sounds like a air flow problem caused by a reaction from the cooling system warming up. Best bet have it scanned by a shop & sensors & emissions checked. good luck

you need to find the fuel pressure release around the fuel rail press the little tab when the car dies. If there is no fuel coming out from that point, your fuel pump is going.