Question about 1998 Volvo S90

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No power to the fuel pump..but when remove the negative terminal u get power to the pump

When grounds off gets power to the pump,...when the grounds wire to the battery terminal is off u get power BUT THEN ON U DO NOT GET POWER TO THE PUMP

Posted by M. D. on


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  • Volvo Master
  • 21,873 Answers

With the key on, you should get power for the first 3 seconds. Then the computer has to see oil pressure or RPM to know that the engine is running before it will power the pump relay.
The computer grounds the relay to make the connection for pump power. The power is cut if the engine is not running to prevent a fire in a wreck.

Posted on Sep 13, 2012


5 Related Answers


Ronald Mueller

  • 1263 Answers

SOURCE: 1985 Volvo 240 no fuel no spark

well first the fuel pump relay is bad, that is easily replaced. next you have no spark. the first thing you do is take the cap off the distributerand crank the engine. if it spins that tell syou thyat at least the tang or gear on the shaft of the distributor is ok and not broken. next thing is remove the #1 plug and use a 1/4 drive extension 6" long and turn the crank by hand until the #1 cylinder is top dead center(put the extension in the hole of head where the plug was and you should feel the top of the piston also make sure you can feel the top of the piston with half the extension this way you don't drop it in the cylinder with the piston at TDC(top dead center) the rotor of the distributor should be pointed at the #1 firing position. IF it does not that means your timing is off and you need to retime it by taking off timing cover and either replacing the belt/chain or gears. now if you do not have a distributor and you have a coil pack there could be only 2 things that won't give spark. either a bad coil or your altenater is bad(the battery is responsible for starting not running the vehicle like alot of people assume. the altenator energizes the coil which inturngives spark. hope this helps you please rate this thanks

Posted on Sep 07, 2008


paul campbell

  • 1071 Answers

SOURCE: Removing fuel pump from 1993 volvo 940. I know

you have to spin the pump a little and work around pay attention to how it comes out my first one i got excited and couldnt get it back in but i lowered the tank a little and it was easier

Posted on Jul 21, 2009


  • 133 Answers

SOURCE: 1984 DL in tank fuel pump.

The in-tank pump does run constantly. The outer pump is the one that is switched. I'd suggest that you rewire properly, as using a jumper will cause you more headaches.

Posted on Oct 30, 2009


  • 3 Answers

SOURCE: 1997 Volvo 850 no power to the fuel pump. I do

pull off the fuse box cover under the hood. held down with 4 T25 screws. Replace the red relay.

Posted on Nov 15, 2009


  • 58 Answers

SOURCE: i have a 1988 volvo 240 gl and my main fuel isnt getting power

There is a fuse up by the Battery alone in a white receptacle with red wires. It may not be blown but is corroded. Thoroughly clean it. This feeds the Fuel pump circuit.If tat is good the white fuel pump relay under the glove box may be bad.

Posted on Jan 14, 2010

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2 Answers

Alternator how to change an alternator in a 2004

Purchase a replacement of the same make and model.
Disconnect the negative battery terminal. Disconnect the alternator taking note of the plug/wire positions.
Slacken off the belt tensioner and remove the belt, taking note of its routing.
Unbolt the old alternator and fit the new one.
Refit the belt and tensioner.
Reconnect the battery.
Job done.

Apr 09, 2018 | Cars & Trucks

1 Answer

Wont start fuel pump

Hi Louis, I'm AL the owner of Big As Auto Repair in St Charles Mo

Louis, the best way to check power to the fuel pump is using a test light and probe the power wire on the connector at the pump, but you'll need to drop the tank a little to get to the connector. NOTE: Run a jumper wire from the battery negative cable to make sure you have a good ground. Touch the power wire while someone turns the key on, if the test light comes on the power is good. BUT, you also want to check the ground wire and here's how you do it. Move the jumper wire from the negative terminal too the positive terminal at the battery, next probe the ground wire at the pump connector, if it comes on then both power and ground are OK and you will need a pump. BUT, if one or the other doesn't come on then you'll need further assistance, please send your family and friends to my website and if you need further help click here: Auto Repair

Mar 18, 2015 | 1998 Dodge Caravan

1 Answer

I have a 1996 Acura 3.5 R.L. just put a new fuel pump in and it won't start. It turns over, but will not stay started.

Check your main fuel relay.

Fuel Supply System

PGM-FI Main Relay


This PGM-FI main relay is located behind the dashboard

lower cover. The PGM-FI main relay actually contains

two individual relays. One relay is energized whenever

the ignition is on. It supplies battery voltage to the PCM,

power to the fuel injectors, and power for the second

relay. The second relay is energized for 2 seconds when

the ignition is switched on, and when the engine is running.

It supplies power to the fuel pump.






Relay Testing

NOTE: If the engine starts and continues to run, the PGMFI

main relay is OK.

1. Remove the PGM-FI main relay.

2. Attach the battery positive terminal to the No. 3*

terminal and the battery negative terminal to the

No. 2* terminal of the PGM-FI main relay. Then

check for continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

• If there is continuity, go on to step 3.

• If there is no continuity, replace the relay and




3. Attach the battery positive terminal to the No. 4 terminal

and the battery negative terminal to the No.

7* terminal of the PGM-FI main relay. Then check

that there is continuity between the No. 3 terminal

and No. 1 terminal of the PGM-FI main relay.

• If there is continuity, go on to step 4.

• If there is no continuity, replace the relay and


4. Attach the battery positive terminal to the No. 1 terminal

and battery negative terminal to the No. 2*

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 5* terminal and

No. 2 terminal of the PGM-FI main relay.

• If there is continuity, the relay is OK;

If the fuel pump still does not work, go to Harness

Testing on the next page.

• If there is no continuity, replace the relay and






To IGN. 1 To BAT



A13 and B1




Sep 18, 2013 | 1996 Acura TL Series

2 Answers

93 chevy caprice 5.0 new fuel pump changed relay and fuse still can't get pump to work can't even get relay to click checked power to relay and used jump wire to pump prime wire pump works w

If relay worked when placed in another vehicle you must have a wiring problem. trace wires from fuse block to relay checking for corrosion or short.

Jan 12, 2013 | Chevrolet Caprice Cars & Trucks

1 Answer

Looking for trouble shooting help with 2002 fuel pump under turbo chevy 3500 4x4 crew cab pickup. Relay doesn't seem to be getting signal to it from (?).i put voltmeter on coil side of relay and turn...

Did you do it like this? Voltmeter: black lead on negative battery terminal, positive lead on one of terminals on coil side- turn key to on, and see if there is voltage for about 2 seconds. If yes, check negative terminal of relay's coil side. If no voltage, move positive lead to other terminal for coil side. Turn key to on, and see if you have voltage for about 2 seconds. If yes, test negative side of relay's coil for good ground. If no signal at either terminal, the signal may be lost from the pcm.

When you turn the key to on, this will prime the fuel system-pump will turn on for only 2 seconds with key in on, and then if no crank signal, pump will turn off (the relay will not stay energized, so no power will go to pump). But when the engine is cranking over, the relay is energized, the coil side will stay powered as long as engine is cranking. After the engine is running, usually an oil pressure switch is tied into the fuel pump circuit, so the relay is no longer needed to put power to the pump. The pump will always be running when engine is cranking, and when engine is running, but the relay no longer is needed when engine is running. See?

Jan 24, 2018 | 2002 Chevrolet Silverado 3500

1 Answer

Fuel pump and filter appears to be clogged no fuel getting to the eingein

Be very safe when you work with fuel and electricity. Only work with live wires when you are trying to measure their voltage. If fuel leaks then don't work with it until all the fuel vapor is gone. The first to do when you work on a vehicle is to disconnect the negative terminal on the battery.

There must be 12V to the pump for it to pump. If power is to the pump and the pump does not run then the fuel pump and fuel filter need to be replace. If no 12 V is to the pump then you have an electrical problem. Sometimes the pump motor fails or a wire shorts to ground. Either of these can cause a fusable link to blow. If a fusable link is blown you should disconnect the wires to the fuel pump. Next replace the fusable link and if it blows right away then the wires are shorted to ground somewhere. If you now have 12 volts to the wires you disconnected then disconnect the negative terminal of the battery and connect the wires to the pump. With the battery connected and you get fuel pressure then the engine should start. If you get no fuel pressure then the pump needs to be replaced along with the fuel filter.

I hope this helps.

Sep 19, 2011 | Hyundai Tucson Cars & Trucks

1 Answer

Car cranks but dose not start, there is no power to distributator or fuel pump

I suspect the at this point, the main relay is defective. This relay controls power to fuel and spark circuits.

The PGM-FI Main Relay is actually comprised of two individual internal relays. When the ignition switch is initially turned ON , the Powertrain Control Module (PCM) supplies ground to the PGM-FI Main Relay. This ground triggers one of the PGM-FI internal relays that sends battery voltage to the fuel pump for two seconds to pressurize the fuel system.
When the engine is running the PCM supplies a continuous ground to the PGM-FI Main Relay. The supplied ground keeps the relay in the "closed" position providing electrical current to the fuel pump, keeping the fuel loop pressurized while the engine runs.
If the engine is not running with the ignition on, the PCM cuts the ground to the PGM-FI Main Relay, causing the relay to "open" and stop the electric current flow to the fuel pump. As mentioned previously, if the engine is not running, the PCM will only supply ground to the PGM-FI Main Relay for two seconds when the ignition switch is initially switched to the ON position.
The PGM-FI Main Relay also supplies electrical power to the Idle Air Control (IAC) Valve and to the fuel injectors.


If the engine starts and continues to run, the PGM-FI Main Relay is working and does not need to be replaced.
  1. Locate and remove the relay.

On some models of the Civic and Civic del Sol it is located to the left of the steering column under the dash. Many later models position it either near the passenger right side kick panel under the dash or by the driver left side kick panel up under the dash.
  1. Attach the battery positive terminal to the No. 2 terminal.
  2. And the battery negative terminal to the No. 1 terminal.
  3. Check for continuity between terminal No. 5 and 4.
  4. If there is no continuity, replace the relay and retest

Aug 05, 2010 | Honda Civic Cars & Trucks

1 Answer

No spark or power to fuel pump

I would first check the fuse labeled 'Fuel pump" first, did you test the fuel pump also to make sure it works independent of the ignition switch? You can do that by using a jumper wire from a 12 volt source and running that to the posiitve pump terminal and a ground wire to the negative terminal to determine if the pump works independent of anything else.

Jun 05, 2010 | 1995 Ford Contour

1 Answer

1992 Eagle Talon TSI Fuel Pump not coming on like normal

the book just told me the fuel pump relay is near the ecm under the center console and to test it put the positive to terminal 10 and negative to terminal 8 and with power to the relay connect the negative probe of a voltmeter to the battery negative terminal (where the - is to the relay) and connect the positive to terminal 4 then 5 it should read out about 12 volts at each terminal, connect the jumper leads terminal 9 to battery (+) and terminal 6 to the battery (-) and with those relays connected to the relay check for continuity between terminals 3 and 2 there should be continuity remove the ground from terminal 6 the ohmmeter should read now read no continuity install jumper lead to terminal 3 to battery (+) and terminal 7 to battery (-) check for voltage at terminal 2 and battery (-) should be about 12 volts remove (-) from terminal 7 now should read nothing if anything doesn't read out what i said replace it and the numbers for he terminals start from the plug part you had to push on to remove the wires it goes 1-5 on the top and the bottom 1-6 and this would be with the clip on top if this did not help let me know i will read off the next part to check

Dec 29, 2008 | 1992 Eagle Talon

2 Answers

No power after changing gas fuel pump for 91 chev

You have a short to ground.What that means is,you have a power wire...............that is grounding on the vehicle somewhere,or possibly back in the fuel pump.The fuel pump theoretically could be shorted internally causing the problem.It also could be a wire or wires back where you were working possibly got pinched.Disconnect negative battery terminal until problem is solved.

Jul 12, 2008 | Chevrolet 1500 Cars & Trucks

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