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Engine will not start, fuel pump is working but no power to the pump

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Some cars have fuel reset buttons look in manual for location, if not check fuel pump fuse

Posted on Mar 17, 2011

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No power to fuel pump on 96 ford explorer


Check the fuel pump relay. It's located in the relay box under the hood on the drivers side.

Jun 19, 2014 | 1996 Ford Explorer

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My 2005 l200 wont start but if you run a lead from battery to switch on pump it starts take lead of and it stops new switch on and still no start.


The fuel pump is powered from a relay. That relay is powered by the engine's computer ("ECU"). The relay is necessary to scale the low current control signal from the ECU into a high current switch to operate the fuel pump. The high current circuit will likely contain a fuse. That fuse or the fuel pump relay may be defective.

The fuel pump relay is activated for a few seconds when the ignition is turned on before starting the engine. If everything is working properly, you should be able to hear the fuel pump run for those few seconds before starting the engine. This is so the injectors have adequate fuel pressure before the engine is started.

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Check the fuel pressure. The pressure regulator may have gone bad and is delivering too much pressure to the fuel rail, thereby flooding the engine.

Dec 07, 2013 | Cars & Trucks

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Will not start will crank will start with starting fluid but when quit spraying eng quits


`Probably the fuel pump in the tank has stopped working. Verify with a check for power at the gas tank connector: When the engine is cranking, the fuel pump wire should have power on it-use a test light or voltmeter. If the wire has power, but pump will not turn on, the gas tank will have to be removed to replace the pump.
Just by turning the key to on, not start, will or should cause the fuel pump to come on for about 2 seconds to pressurize the fuel lines and put gas under pressure against the fuel injectors. If you don't hear the pump buzz on for a brief time, you know you need to check the fuel pump circuit. Check fuse, check fuel pump relay...but the easiest way to verify a bad pump is to check fuel pressure, or check for power at the gas tank when the engine is cranking. No power is a fault in the circuit (fuse, relay, wiring), power available to the pump but no pump means the pump will have to be replaced .

Oct 17, 2013 | 2001 Ford Windstar

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I have a 98 Camaro I put a fuel pump in fuel filter an my car still won't start.Do thank the gas line clog up?


If you know for a fact the pump is getting power and ground, and nothing is coming out of the line before the filter, then yes the line could be clogged up.

Aug 03, 2013 | Cars & Trucks

1 Answer

1999 Ford Explorer Sport Starting Issue


It sounds like the pump is failing. That or sometimes not getting electricity. To check which it is, you could use a voltmeter or test light at the gas tank's electrical plug in. You need to check for power on the fuel pump wire when the engine is being cranked for starting. Do this when turning the key to on does not cause the pump to turn on for 2 seconds as it should. The fuel pump has power for those 2 seconds when key is turned to on, and again has power when the engine is cranked. You might miss the two second signal, so check for power when car won't start-when pump won't turn on-and with the engine cranking. If you have a signal then and still no pump coming on, then you must have a failing pump.
But if you have NO power to fuel pump wire with engine cranking, then it is a problem elsewhere-probably the pump relay (try a new relay if you haven't already). That relay is signaled by the engine computer when key is turned to on or when engine cranks . so you could do some testing at the relay if needed.

Mar 04, 2017 | 1999 Ford Explorer

2 Answers

Fuel pump not always on


Did you reset the inertia switch that shuts pump down in case of collision?

Feb 18, 2012 | 2000 Mercury Grand Marquis

1 Answer

2000 mercury grand marquis 4.6 fuel


Voltage drop test the electrical circuit , do know how to do automotive electrical testing . Lose connection , resistance in the circuit , lose ground Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia Testing Electric Fuel Pump Problems with Voltage Drop Test

Feb 27, 2017 | 2000 Mercury Grand Marquis

1 Answer

2000 mercury grand marquis 4.6 Intermittent problem. 35,000. miles. Problem engine died several times wile driving. Also after car is parked from a drive will not start. Found that the fuel pump is not...


I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
Intermittent problems are a pain, have to test when problem is ongoing.
mercury fuel pump-i4kx0gxqalhdz4ok10irisui-5-0.jpg

Feb 27, 2017 | 2006 Mercury Grand Marquis

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

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