Question about 1995 Nissan Maxima

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No start unless I unplug the fuel pump relay,

It will start then run untill the pressure drops, I plug in the relay it will run but not well. If I plug the relay in to soon the engine will just stop. I replaced three injectors ( under intake, rear) and the fuel pump and still have a problem.

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  • 235 Answers

If your engine light is on then the problem is in one of your sensors. Get the code from the computer and it'll be in the manual.

Posted on Jul 01, 2009

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1 Answer

Why does the fuel pump relay don't click when i turn the key to run? and why there is no power at the fuel pump relay?


the operation of most fuel pumps is controlled by the fuel pressure regulator
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maybe nothing wrong with your system just the system working as designed
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does car start with test fuel and run, until the fuel runs out.
do you have fuel pressure, while reading the FSM , way of doing it.
some cars only make fuel pressure, cranking and runing.
other make pressure, for 3 seconds key on, and cranking and running only, and all cars drop pump and injections when ECU sees spark die.
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Why does it always takes two tries to start ?


The fuel pump gets power from the pump relay. When you turn the key on, the relay provides power for 3 seconds and stops. The pump then gets power once the engine is running.
If the relay is bad, you have to crank the engine until you have oil pressure to get power to the pump. Also if the check valve in the pump is bad, it will let the fuel pressure drop back into the tank when the engine is off.
So it could be a faulty pump relay, or the check valve in the pump.
You would need to get the fuel pressure checked before the truck is started cold.

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mass airflow sensors don't have a vacuum line, you sure you don't mean the EGR valve? if it was the regulator i doubt it would run good or make much of a difference unplugging the vacuum line, take a reading of the fuel pressure, if it starts to drop while the van is running you have a bad regulator.

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1997 chevy k1500 won,t start cold starting fluid will start truck


I would check the fuel pump relay first. You should have some fuel pressure in the lines when you turn the key on. The relay is powered for 3 seconds to boost pressure until the engine starts.
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