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Fuel pump runs for 3 second then shuts off - Blazer Chevrolet Cars & Trucks

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Akthough I normally skip posts without Make and model. this is an easy one

This is normal. It does that to pressurize the fuel injectors .

No problem

Best regards
Mike

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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SOURCE: starts and runs 3-5 seconds and shuts down

Sounds like your security system is shutting the car down. You should be able to leave the key on for 15 minutes and it will reset itself. Make sure you are using factory keys, and they are in good condition.

Posted on May 28, 2009

  • 22 Answers

SOURCE: 1994 grand cherokee 4.0 starts and stalls 3

turn the key in the lock on the drivers door. its ur security is turning the fuel off

Posted on Dec 22, 2009

  • 1 Answer

SOURCE: passat 96 tdi , only runs for 2-3 seconds

i have 2 keys for my passat.with 1 key the engine runs perfect and with the other key the engine runs 2-3 seconds

Posted on Feb 22, 2010

  • 409 Answers

SOURCE: 1988 silverado, tbi 350 has 12 psi fuel pressure,

Fuel pressure is a little low, check the pressure regulator, and the fuel filter

Posted on Mar 09, 2010

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1 Answer

Where is the inertial fuel shutoff located on a 1999 Mercury villager van?


It is called the inertia switch or fuel pump cut-off switch

The fuel pump shut-off switch is

located in the driver's foot well,

behind the kick panel. The reset

button for the fuel pump shut-off

switch is accessible through an

opening in the kick panel.

Use the following procedure to reset the fuel pump shut-off switch.

1. Turn the ignition to the OFF position.

2. Check the fuel system for leaks.

3. If no fuel leak is apparent, reset the fuel pump shut-off switch by

pushing in on the reset button.

4. Turn the ignition to the RUN position. Pause for a few seconds and

return the key to the OFF position.
5. Make a further check for leaks in the fuel system.

Jun 26, 2017 | Mercury Cars & Trucks

2 Answers

95 Isuzu p/u fuel pump runs with key in the start position, but fuel pump does not run with key in the on position


The fuel pump only runs when the engine is being cranked or of course is running, it is shut off after about 1 second in the run only position.

Feb 09, 2017 | Isuzu Cars & Trucks

1 Answer

Getting fire on the fuel pump relay but no fire to the gas tank. is there a safety shut off on the car?


wow1 ,no symptoms posted really?
wow2 , no year car stated... now that is challenging.
1998-2009
fire?
the pump , is electric, in the tank.
and it gets 12vdc (not fire) to it, from the fuel pump relay.
and the relay is controlled by the ECU/PCM (no year, no guess)
the PCM closes the relay cranking.
so that takes 2 persons to test it , one at key , one at pump or a very long set of test wires.
some suzuki run the pump for 3 seconds, key on, but only some do.
my 96 dont. for example nor my 2004. Vitara.
and in 3 seconds, (if it does) you will miss that easy.
that is how its done on all EFI cars on earth.
connect the volt meter, and crank, got 12v or at least 11v?

i check fuel pressure by the FSM book first. and save all this fiddling about. no take pulling and such rot.

shut off questions.
2.5L and 2.7L sold.
the 2005 (wild guess)
shows no such shut off and is still a loop system.

now fuel pump 101
the ECU is programmed to run the pump only cranking and engine run time.
so we check pressure, cranking, it will be highest then.
38-44 psi
on some years the pump can run for 3 secondes, keyon.
this is programming, and many years, this 3 second rule was changed. to non.
so we always crank the engine to check fuel pressure, or lose the game.
this is for prevention of crash and burn, like seen on TV>
and to prevent hyrdalocking the pistons.
the PCM cuts fuel for many reasons (logic)
1: lost spark
2: throttle stuck wide open throttle , eg: TPS sensor ground cut(busted)
3: dead CMP or CKP sensor (1 or other can kill spark)

any scan tool can see 1,2,or 3, just scan it.cranking, and keep the key on. until the scan too finishes its scan.


Sep 30, 2014 | Suzuki XL7 Cars & Trucks

1 Answer

Can u make the fuel pump run when key is on


the pump will only run for 3 seconds then shut off until the engine is cranked at which time it should stay running until the car is shut off.

Nov 03, 2013 | Ford F-350 Cars & Trucks

1 Answer

Where is fuel pump switch


When you turn the key on--- the fuel pump only
runs about 3 or 4 seconds

There is no switch only on Ford Products

Feb 18, 2013 | 2004 Pontiac Grand Prix

1 Answer

I have a 1987 Plymouth Voyager that starts, fuel pump comes on but it just runs a few seconds and stops. If you turn the key off and back on, the fuel pump comes back on but shuts back off in a few se


On the fuel rail will be a small round valve type thing with a rubber vacumn tube running to it ,check the tube and make sure its connected as this will stop it from running as it opens the fuel rail for the injectors

Jan 03, 2013 | Cars & Trucks

1 Answer

97 f350 5.8 disconnected fuel line from tanks to inline filter turn on key pump runs momentarily then shuts off only supplying small amount of fuel from either tanks


Generally speaking, its supposed to do that.
The fuel pump(s) is powered by a relay that turns on for 3 seconds when you turn the key on. If the engine does not start and produce oil pressure, thats all the power the pump gets. If you were in a wreck the pump would shut off when the engine dies even with the key on to prevent a fire.
You would need to jumper the relay to make the pump run beyond the 3 second time.

Aug 03, 2012 | Cars & Trucks

1 Answer

I have a 2000 Ford Contour and I have a problem with the Fuel system. I have changed the Fuel Pump and Filter and the car still will not run. When I turn the key to on, I can here the pump running for...


that is exactly what it is supposed to do. It shuts off if the engine does not start.
The fuel pump does run while the engine is cranking though.

Spray some starting fluid in the air intake or throttle body fr about 3 seconds. If starts for a few seconds, then you have a fuel problem. If not, then check for spark at the plug wire.
report results.

fuel pressure should be 40 psi.

May 26, 2011 | Ford Contour Cars & Trucks

1 Answer

Runs for a few seconds and then quite


It could be a fuel pump issue, do you hear the fuel pump run when you turn the ignition to run position? Just turn the key to on (turn the radio off and buckle the seat belt so you can hear better) you should be able to hear the fuel pump. It will be a hum from the rear of the car, the pump should run for 3-5 seconds then shut off.

Dec 04, 2009 | 1989 Ford Escort

1 Answer

Starts up and dies


Let me explain real quick the fuel pump circuit, when you crank to start that is a straight circuit to the pump via a fuse in most cases, when the engine starts and you release the key the fuel pump relay is energized and keeps the fuel pump running, it sounds like the fuel pump run relay may be the problem with your car, replace it or bypass it to test, if you don't understand how a bosch relay is wired don't jump it yourself, you can burn up the wiring.

Nov 05, 2008 | 1992 Mazda MX-3

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