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Car turns over good but doesnt fire up could it be a relay

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Its possible , but there are dozens of possibilities. First thing to check with this problem is fuel! Do you hear the fuel pump run when you turn the switch on (assuming there is enough fuel in the tank to pump)?

Posted on Jan 01, 2013

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on....


you said you tried applying direct voltage to the pump? proceed to remove the fuel tank and check the harness inside for continuity, both wires going to the pump itself. If wires prove to be ok , then proceed to replace pump .

Apr 17, 2014 | 1992 Chevrolet K1500

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on....


You said you jumped the wires for the pump? Was that at the pump relay?
If you have a voltmeter or test light, keep the jumper wire in place and check for voltage at the fuel tank connector. The pump wire will be gray. With relay out and jumpered there, you should have battery voltage at the fuel tank connector. The key doesn't even have to be on, cause the relay has voltage to it at all times. If you jumpered it right (terminals 87 and 30 on the relay), and no voltage at the tank connector, you have a broken fuel wire somewhere between the relay and the fuel tank.
If you do have voltage at the tank, but the pump still won't work, only two possibilities, a bad pump or the ground for the pump is lost. Check the pump ground first.

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1 Answer

Have a 1999 ford explorer sport 4x4, cranks want start. have replaced fuel pump, crank senser and cam senser, checked fuzes, replaced computer. doesnt seem to be firing


When you turn the key on you should beable to hear the fuel pump come on. Other than that you have a fuel pressure test port, looks just like a tire valve stem get a little probe press the valve after cranking fuel should come out strongly and not dribble out. If is doesnt seem to be firing your going to have check the coil pack for spark from the coil pack take one plug wire out and put it in a position that as you crank the vehicle you will be able to see spark jump or even hear give it a 1/4 air gap from its connection. If you dont have spark and your timing chain isnt broken you need to check for power the choice of tool is a test light.or volt meter. If you dont have either test tool we will go by sound when you turn the key on the engine fuse box has relays do you hear them click. That click noise will be fuel pump relay and PCM relay for power inpect those relays for corrode connections you mainly have a power problem and inspect for proper ground a missing ground can also cause the ECM to not fire the coils2_26_2012_7_32_43_am.gif

Feb 26, 2012 | 1999 Ford Explorer

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Chevy 1500 1996 doesnt start just keeps turning over I have replaced fuel pump , Fuel filter , Checked to see if it had spark and it did , Changed pressure regulator , Crankposition sensor and still...


see if your fuel pump is geting power to it stick your ear in gas filler take off cap an have someone turn key thats first your fuel pump relay thats on the fire wall in the engine compartment might be no good thats what turns on pump its on the left side of fire wall with a black cover over it

Aug 21, 2010 | 1996 Chevrolet C1500

1 Answer

Engine turning over and firing but wont start. timing chain looks good, has new crank sensor, o2 sensors, and cat.


check wiring, fuses and relay for fuel pump and check fuel filter---also recheck to crank sensor wiring ,connections and sensor new doesnt mean not defective

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1996 Chevy Lumina wont start. Relay fuse on passenger side under hood clicks. tried replacing it, wont start. but if you wait 8 hours, a day or two, and try, it fires fine??? The only time it wont run is...


Could be several things....but i need more information. When it doesnt start, does it crank or when u turn the nothing at happens other than the relay?

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there is more than one switch to the fan, check on the side of the fire wall for a temp modual.

Aug 19, 2009 | 1997 Volkswagen Cabrio

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Ac quit running,compressor doesnt run,fan doesnt run,no bad fuses or relays that i can find,replaced controls


It may be your ignition switch. Bang on the bottom of your steering column with the key in the "on" position and see if the fan will fire up. My car is doing the exact same thing right now, but I can basically rub the bottom of the trim under the steering column and it comes on. It will also start when I hit a good bump on the road.

Good luck!

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Well when you turn the keys on the pump will only run for a few seconds A test light works ok but i would use a volt meeter at th efuel pump power and groung wires and measure the voltage while cranking the car

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