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Fuel pump only comes on in start position-goes off in run

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Is it EFI or carby?

EFI, is ther an injector pulse and spark?

carby, does the oil pressure light come on before cranking?

Posted on Jul 15, 2008

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My car wont start up


First of all, the new fuel pump may be bad. disconnect line at fuel filter where it goes through filter. and see if fuel flows, or have someone to put hand flat on bottom of tank and try to start car. if fuel pump is working you will feel a vibration on tank. if it does not work, check the fuel pump fuse in fuse box before you exchange it.and or the fuel pump relay! when car is running it runs constantly, when you simply turn key to on position, it runs for about 3 seconds(until fuel pressure in line comes up. and then cycles off.

Apr 05, 2014 | 2000 Chevrolet Malibu

1 Answer

Have 99 s-10 4.3 fuel pump will not run when key in start position have replaced relay


Have you tried replacing the fuel pump? Sounds like your pump is burned out. Check the voltage at the pump when it should be running. If you have voltage then your pump is probably bad. If you don't have voltage work backwards checking all electrical connections until you find the bad one.

Jan 14, 2014 | 1998 Chevrolet S-10 Pickup

1 Answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

Feb 13, 2011 | 1992 Ford Thunderbird

4 Answers

Fuel pump/filter? ran out of gas, can't seem to prime after 2 gal in tank, runs when placing a bit in through throttle body then dies.


might of clogged filter also 2 gal might not be enough check for fuel pump noise also when you run these cars out of fuel the pump over heats and goes bad

Jan 13, 2011 | 1999 Chevrolet Malibu

1 Answer

Engine will not start.fuel pump does not run. intermittent problem. has been getting progressively worse. have changed fuel filter. checked electrical connectors.need accurate wiring diagram. chiltons...


start by checking the fuel pump fuse and relay. will the fuel pump run for a few seconds when you turn the key to the run position? If so you may need to replace the crank position sensor. When this goes bad the engine will turn over and start, but only run for a second or two then die like its out of gas.

If you do not hear the fuel pump coming on and the fuse and relay check out good then you will have to see if there is power going to the fuel pump. if power is present at the fuel pump plug then the fuel pump is bad

Oct 21, 2010 | 2003 Ford Mustang

1 Answer

I have a 1987 chevy s-10 blazer v6 2.8 fuel injected dat starts up but dies out?


sounds like the fuel pump is not staying on or the ingtion switch doesn't make in the run position ( happens alot to vehicals take have lots of keys hang on the switch) The sparp going away is easy to check with a test light theres a connector on the distrubutor that has a heavy red wire plugged in that goes to the B+ terminal it should be hot with the key in the run position. if it's dead fix the connection at the ingtion switch ( it's on top of the steering collum and all but one wire will be hot with the key on, that one comes hot in start) if it's good the fuel pump is next it has a fuse on the passenger side firewall next to the fuel pump relay. Fuse bad or relay bad or dirty it'll act this way. The start wire entergizes the pump in crank position. then the oil pressure switch takes over and keeps the pump on. theres 3 wires on the oil pressure switch the center wire works the light the left one is fuel pump fuse power and the right one is the fuel pump. the oil switch can go bad and the connection can go bad the wire can fall off or get broken. the wire to the fuel pump may not get all the way to the pump.. You can add power to any wire on the swich with out hurting anything. all of the wires will be hot with it plugged in and running. unplugged two wires are hot with the key on ones the light ( oil Pressure light) the other is the key on power for the pump with oil pressure the switch closes and the pump comes on and it'll be powered right off the starter as it's cranking. If the switch is leaking oil its likly failed too.

Oct 01, 2010 | 1987 Chevrolet Blazer

1 Answer

318 starts but wont stay running blows black smoke out tailpipe. It has new fuel pump, filter,timing chain plugs,wires...


The older chrysler products have a ballast resister on the firewall that is used for dropping the voltage to the ignition coil. During a start procedure, while the key is turned all the way in start position 12 volts bypass the resistor forcing a high output of coil voltage. When you release the key to the run position 12 volts goes ito the resistor & a lower voltage of around 6-7 volts comes out, & goes to the coil.
What happens, is the resistor breaks inside and no voltage is coming out the resistor. Thus only a start condition exist with no run.

Sep 15, 2010 | 1988 Dodge Ramcharger

1 Answer

No fuel coming out of fuel line


the system is working properly, the engine has to start for the fuel pump to continue to get 12 volts, if u cylce the key on the pumps runs a few seconds and then goes off, your pump is getting correct signal it just isn't running, u need a fuel pump.

Jan 09, 2009 | 1995 Nissan Quest

2 Answers

92 honda civic turns over fine but doesnt start


ok, this is a commom problem with this 92 hondas,

it may be the pump fuel relay, which is under the dash on the driver side by the fuse panel.

here is a way to determine that.

when you turn the key on the on position

do you hear the fuel pump running while the engine light is on, and does the pump stop running afteer the engine light goes off?

if you do hear the pump running then it means that fuel pump is working fine ( since it way just replaced), but if you don't hear it running while the check engine light is on ( about 2 seconds) chances are the fuel pump relay is not working as it should.


also there are clicks that have to be heard on the starting process.

1 when you turn key to on possition

2 when the check engine light goes off( a click has to be heard just after it goes off)

3 after the car starts

If you don't hear this clicks, try to get your ear close the location of the fuel pump relay( near the fuse panel under the dash).


the fuse relay is just a bunch of circuits soldered, so you can get it to someone who knows how to solder and fix it.

or just get a replacement one at any junkyard. ( cheapp)

Nov 30, 2008 | 1992 Honda Accord

1 Answer

1992 hyundai-excell


HI
DID YOUR CAR WONT START ????
IT WELL COME WHEN START BECAUSE THE (ECU )RECEIVE THE START SIGNAL ??
BUT IT WAS NEED THE (CKP)SENSOR SIGNAL TO START IT IN RUN ??
CHECK FOR THAT !!
ASK ME FOR MORE AFTER CHECK ??
WITH MY BEST WISHES

Jul 15, 2008 | 1992 Hyundai Excel

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