Question about 1999 GMC Savana

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No power to fuel pump

No power to turn on pump relay

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  • yadayada
    yadayada May 11, 2010

    ignition switch

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  • GMC Master
  • 6,826 Answers

If fuses are all good check oli sending unit it has a cut off built in in case oil presure drops so it can be the problem,,, oli sending unit may be leaking or not if it is bad

Posted on Jun 30, 2009

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  • 2 Answers

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Posted on Jan 02, 2017

  • 979 Answers

SOURCE: 1996 CADILLAC DEVILLE, NO POWER TO FUEL PUMP

Check for a burned fusible link under the hood. If you have power at the fuel pump relay, you could have a bad ignition switch or bad oil pressure switch...accordianman

Posted on Dec 15, 2008

  • 29 Answers

SOURCE: fuel pump relay

Located under the steering wheel. The fuse should be #28 and the relay will have 167 or 409 on it. Here is a link to a wire diagram for the TT
http://mk1tt.montebellopark.com/pdf/2002MYStdEquipWiring.pdf

Posted on Feb 06, 2009

  • 6 Answers

SOURCE: 94 jetta fuel pump wont work

Check your ecm relay I had one go goofy on my 1994 Passat it controls power to the ecm modual the car will turn over but will not start it should read 109 on the top of the relay I replaced it in my passat and it fired right up and I havent had a problem since

Posted on Feb 14, 2009

asetech74
  • 218 Answers

SOURCE: toyota camry 95' fuel pump won't turn on

I would definately check the fuel pump relay, should be located in power distribution box in your vehicle, you may be able to switch it out with a relay of the same type to see if it turns on the fuel pump, but you may need a new fuel pump if this doesn't fix it. Hope this helps.

Posted on Mar 10, 2009

lsteward68
  • 331 Answers

SOURCE: i can get power th the fuel pump when i run a hard wire from the battery to the relay but when i put the relay back in no power to the fuel pump

I have a question. Turn the ignition on you should hear the pump for about 3 seconds. then it should stop. this is normal operation. then when a signal is sent to the ignition that you are going to crank it then it switches on. I can see how this can seem like the pump is not working but after you crank it you should be able to hear the pump for about 1-1.5 seconds after the crank then it will stop. The pump will not turn on until it is told to do so by the computer.

Posted on May 25, 2009

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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

05 Chevy cobalt have no power to fuse block for fuel pump


You have no voltage at 15 amp fuel pump fuse in the under hood fuse/relay center ? There is a fuel pump relay also in same under hood fuse box. The fuel pump fuse gets power from the fuel pump relay. The ( PCM ) engine computer controls that relay, gives power or ground electronically to turn the relay on giving power to the fuel pump through the fuel pump fuse. You could have a bad relay or an anti-theft system problem . What engine does you vehicle have 2.0 L or 2.2 L the 2.0 L engine gets power differently to fuel pump .

Dec 28, 2014 | 2005 Chevrolet Cobalt

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I have a 1996 mustang v6 no power to fuel pump. Bought used fuel pump relay still have np power. Safty switch is good. Unpluged fuel turned switch on and i have constant power of 9.52 volts plug in pump...


9.5 volts sounds like the power coming from the gas gauge.
I am showing a relay module with the fuel pump and pcm relays built in along with two other relays. The fuel pump relay should not be accessable. In most cases the pump relay gets power from a 20amp fuse and the computer grounds the relay when needed. Power goes from the pump relay to the inertia switch then to the pump. So the inertia switch should be hot when the pump relay is activated.

Jun 12, 2013 | Cars & Trucks

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

2000 mercurt grand marquis


Not guessing as to what the problem is , testing for voltage drop problems with a volt meter . posted a video on youtube yesterday . If your still looking for guesses forget it , no one on here could say for sure without testing the circuit an hooking up a scan tool to see if PCM is energizing the relay . Do yourself a favor an take it to a qualified repair shop . Fuel Pump Electrical Circuits Description and Operation If you can't learn how to test from this guy , better take to a repair shop .

Mar 01, 2017 | Ford Cars & Trucks

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

1 Answer

Fuel pump relay fault Can't find relay. No power to fuel pump. Checked fuses. All good


Model? Year?

Check per owner manual to be sure inertia switch is not tripped. Remember, fuel pump only runs for 5 seconds when key is turned ON, then it shuts off if engine is not running. Pump always runs when key is in START position.
Listen for pump to run inside fuel tank for 5 seconds after key is ON.

The PCM power relay turns on the PCM and the PCM turns on the fuel pump relay, which turns on the fuel pump.

See owner manual forfuse & relay charts.

Apr 06, 2011 | Ford Expedition EL Cars & Trucks

2 Answers

I have a 98 jimmy.4dr, 4wd..problem --no power to fuel pump....if you stand on drivers side looking at fuse panel (the top right pin of the relay has power, but thats the only one...if i jump power to the...


Fuel Pump Electrical Circuit
OPERATION
When the key is turned ON with out the engine running, the control module turns a fuel pump relay ON for two seconds. This builds up fuel pressure quickly. If the engine is not started within two seconds, the control module shuts the fuel pump OFF and waits until the engine starts. As soon as the engine is cranked, the control module turns the relay ON and runs the fuel pump.
When the engine is cranking or running, the control module receives the Crankshaft Position (CKP) sensor reference pulses which in turn energize the fuel injectors. As a back-up system to the fuel pump relay, the fuel pump can also be turned ON by a fuel pump oil pressure switch. When the
engine reaches about 28 kPa (4 psi), and the fuel pump relay does not complete the circuit, the fuel pump oil pressure switch will close to complete the circuit to run the fuel pump.

An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The fuel pump oil pressure switch will turn ON the fuel pump as soon as oil pressure reaches about 28 kPa (4 psi).



You can test to see if the relay it's self is bad by swapping it temporarily with another relay. If your truck has AC then that one should be compatible. Just compare the two to see if they're the same and if so, try using the AC's relay.

Apr 05, 2011 | GMC Jimmy Cars & Trucks

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