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When starting fuel pump continues to run when ignition is turned on

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You most likely have a bad fuel pump relay.

Posted on Jan 01, 2017

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  • Cars & Trucks Master
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Bad fuel pump relay,you have constant power to pump.

Posted on Jan 01, 2017

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Where is cut off switch fuel 2001Mazda 626,


There is no cut off switch for the fuel or the fuel pump in your Mazda (unless one is installed by an owner after the car is built and sold). I don't know why so many people continue to ask this question.

When the ignition is off the fuel pump will not run. When you turn on the ignition but do not try to start the car the fuel pump will run for a few seconds(as long as you have a functional pump) and then the computer will shut it down as the engine is not cranking over.

May 09, 2016 | Cars & Trucks

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I have a 1987 chrysler conquest tsi and fuel pump only runs when key is on start not on run but pump fuel lines not hook only power wires to pump is this how it works?


What does it do with the lines hooked up ? Most fuel injected vehicles need an RPM signal to let the computer know the engine is running to let power continue to the pump .

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1 Answer

The fuel pump dont stop


Hi! The fuel pump is designed to run continuously as long as the ECM receives data that the engine is running. Excess fuel is passed back to the fuel tank.

The fuel pump is also designed to power up for 2-5 seconds when the ignition is turned to "RUN" to pressurize the fuel rail.

If your fuel pump runs continuously when the car is turned off, it may be a "stuck" fuel pump relay.

Oct 29, 2010 | 1994 Chevrolet Cavalier

1 Answer

Car wont start


THere is no gas in the fuel rail at the time gas is running out. WHen you fill the tank, it needs to pump for a while so fuel can fill up the rail then the Fuel distributor so it can build up pressure for the injectors to work properly. It need to continue cranking at least 2 minutes. However you don't want to run out the battery, so can just turn on the key to hear the sound of the fuel pump stops, then turn key off turn key on again. Repeat this for 6 times then start the engine. The reason for it is that every time the key is on it turns on the fuel pump to prime the line then turns pump off after a specific time, then it turns on again only when key is at ignition position. By doing this you help to pump gas into the fuel rail instead of the starter continue cranking draining down battery fast. Cheers.

Dec 13, 2009 | Lexus LS 430 Cars & Trucks

1 Answer

Does a fuel pump continue to pump fuel with ignition on when the fuel line is diconected from fuel filter The car wont start no codes found it has done this a few times this year it runs fine when running...


you have a bad fuel pump it's in the tank and only comes on in these conditions.
1. ignition switch turned to the run position turns on for two seconds.
2. same as above but when engine starts pump continues to run as long as engine runs. and the safety switch for blow out prevention has not been tripped.

Your problem is the fuel pump and fuel sock and the check valve in the pump. only one way to be sure and that's pressure testing. You hook up gage to fuel rail turn the ignition key to the run position look at pressure should read 40 to 50 psi and should hold for 1 minute, if you drop 5 pounds in one minute pump is bad and even if it started they could verify that the check valve is not holding pressure.
This is caused by the life of the pump by using gas with ethonal in it and your car was not designed for it, so it damages the pump and injectors and destroys the filter in the pump.

Nov 28, 2009 | 1996 Lincoln Town Car

2 Answers

My 1990 F150 will not start sometimes. If I turn the switch to the on position and the fuel pump continues to run after 5 Sec , It will not start. If the pump stop running after 5 Sec , it will start.


when u turn the key to run but don't start the fuel pump shuts off after 5 seconds + or - 2 seconds, this is normal, the common cause of no start on your truck is the TFI ignition module on the distributor, subject of many recalls for failing, also change the stator inside the distributor, use factory parts, aftermarket parts fail very quickly. here is a picture of the parts.
da17e03.jpgThis is the stator

This is the TFI ignition module.

Apr 02, 2009 | 1990 Ford F150

1 Answer

No Power to Fuel pump


I would check the ground for the fuel pump relay that operates the switch side of the relay.
You should have 2 12v inputs to the relay. When the relay gets 12v input, it closes the relay switch on the heavy current side that sends 12v to the fuel pump.

A relay is needed because you don't want heavy current going through the switch.

Also, most cars only run the fuel pump for 2 seconds when the key is turned on because you don't want the fuel pump running without the car running. If you listen closely at the fuel tank, you should hear the pump run for 2 seconds when you turn the key to "ON"
When the key is turned to "START", the fuel pump should run continuously.
The engine computer tells the fuel pump to shut off if the engine rpms are zero.
So, I would check the switch side of the relay. Power amd ground.

Mar 01, 2009 | 1992 Jaguar XJ6

2 Answers

Fuel pressure regulator makes hissing sound


your fuel pump should cycle on until the proper fuel pressure is achieved then it should shut off

Jan 25, 2009 | 1997 Volkswagen Golf

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