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Fuel pump working perfectily just no power going to it when i turn key

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SENDING UNIT ,GAS LINE INTERUPT, TAKE THE GAS LINE OUT WHERE DELIVER THE GAS IN THE INTAKE AT FRONT IN THE ENGINE HAVE SOME ONE TO CHECK FOR THE GAS FLOW WHEN YOU JUST TRY TO STAR THE CAR,TO SEE IF THERE IS A GAS FLOW WITH ENOUGHF STRENG, ,,,,,,,,,WARNING JUST HIT THE CAR KEY FOR A SECONG JUST TO SEE THE FLOW AND COVER ANYTHING WITH A RAG THAT MIGTH REPRESENT A POSSIBLE RISK OF TURN ON FIRE. IF GAS NOT COMING OUT AND THE GAS PUMP IS OK THEN THE GAS LINE IS BAD.GOOD LUCK

Posted on May 19, 2011

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Posted on Jan 02, 2017

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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
when the fuel pump gets to set pressure , the pump is switched of by the ECM at the relay level
maybe nothing wrong with your system just the system working as designed
if you have pressure in the fuel manifold when you turn the ignition on then the pump will not run but will if there is a fuel leak somewhere and the pressure drops off

Oct 25, 2016 | Cars & Trucks

1 Answer

My car will not start it cranks but will not turn on. So far I have changed the crank sensor I also have no spark to coil packs or spark plugs Fuel pump does not turn on when I turn the key. What is the...


Begin by checking fuses. Ignition, efi, fuel pump fuses. When key turned to on, do the warning lights and gauges work? That verifies switch has power and is sending power out. With key on, the coil primary wire to coil packs should have voltage.

No spark and no gas? Fuel pump fuse good? I think I would use a test light or multimeter to check that fuel pump fuse terminal has power to it with key on. If that's good, pull connector off at fuel tank and check for a voltage signal on fuel pump wire when the engine is cranking-if good signal, fuel pump needs taken out for replacement or inspection. If no signal check that fuel pump relay has power to it. With key off, pull the relay and check that one terminal has power to it-the feed wire for the pump. If no power signal at all, check maxi fuses or fusible links for a failure.

Sep 04, 2013 | Cars & Trucks

1 Answer

93 geo metro died and wont start. fuel pump works when the fuel pump relay is removed and jumped with a wire. put it back in and turn the key on and i get a click at the relay but the fuel pump does not go...


You should have two sources of power, a ground from the computer, and the circuit going to the pump.
Do you have both sources of power when the key switch is turned to start ?

Feb 25, 2013 | Geo Cars & Trucks

1 Answer

Car cranks but won't turn over after driving fine. fuel pump is getting no power to pump fuel


no power to the fuel pump?? i suspect that their is something wrong with the immobilisor ,try the spare key first before you go any further ,maybe the chip in the key ahs dropped out ?

Dec 06, 2012 | 1994 Chevrolet Cavalier

1 Answer

2002 chev pickup 4.8l fuel pump not always coming on with key = no fuel i jump prime connector and it works sometimes new pump installed already?


The fuel pump is controlled by the Fuel Pump Relay which is controlled by the Powertrain Control Module (PCM). It is really quite simple. If you check for power and ground at the relay, it should go like this: There should be one connector that has Battery power (B+) all of the time. This is the power circuit that feeds the fuel pump motor. The circuit that this feeds will have continuity to ground all the time (You can check this by hooking a test light to B+ and probing the connectors. The light will light up when it finds continuity to ground) - this would be the circuit to the fuel pump motor itself. Another connector will have battery voltage only with the key in the ON and START positions. This is the power circuit for the relay primary coil. (The circuit that operates the relay) Last but not least, one other connector will have ground momentarilly when the key is first turned to the ON position. It will only be grounded for about 2 seconds. It will only do this once in a key cycle. You will have to turn the key off for about 15 seconds and turn it back on to get it to do it again. This is the fuel pump relay control circuit to the PCM - this is what actually turns the fuel pump on and off. If these circuits are all working, then the only other cause would be a bad relay.

Apr 22, 2011 | 2002 Chevrolet Silverado 1500

1 Answer

THE FUEL PUMP HAS NO POWER GOING TO IT 1997 GRAND CHEROKEE FUEL PUMP NOT WORKING AND NOW POWER IS GOING TO IT THRU THE WIRING


ok the pump will only have power going to it for a few seconds when you first turn the key to the run pos. or if your trying to start the engine. after that you must cycle the key to get power to go back to the pump. so have someone turn the key to the run pos and with your test light or volt meter on the power wire to the pump see if it lights up. it should only stay lit for a few seconds. if you ge power for a few seconds you know you have the right wire. if none of the wires have power like that check the relay and fuses. if they check out to be good check all your wiring that pertants to fuel system if all is well you could have a igni issue.

Jul 28, 2010 | 1997 Jeep Grand Cherokee

3 Answers

No power going to the fuel pump?


the crank sensor is most likely the problem. If the PCM does not sense the engine is cranking then the fuel pump will not turn on. Also just because a fuel pump will run does not mean it will pump fuel.. Jump it while its in the fuel tank to see if it will pump. But still when you turn the key on you only have power to the fuel pump for 3 seconds unless you continue to crank. . If you have a 3 second voltage pulse when you cycle the key on, then spray some quick start or brake cleaner. If it now starts and you know the fuel pump has power then the fuel pump needs replacement. If you don't have the 3 second pulse look at the crank sensor as being the problem,

Jun 14, 2010 | 2002 Chevrolet S-10

1 Answer

Fuel pump problems


you have a shut off button in the trunk find it turn it off and turn it back on

Apr 30, 2009 | Mercury Grand Marquis Cars & Trucks

1 Answer

93 merc topaz feul pump wiring harness question


The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

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