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Powering fuel pump fuse

If I power fuel pump fuse from another power source will computer work correctly

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Yes

Posted on Apr 15, 2014

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Changed fuel pump not pumping fuel not working correctly relay good getting power second fuse for fuel pump not working one wire fuel pump in back getting weal power 97 Saturn sl2


If I understand your post correctly you have a fuse for the fuel pump that is blown or blowing. Until you resolve that issue the fuel pump probably will not get enough power to run. If it blows when you replace it the you have a wiring problem to your fuel pump. Most replacement gm fuel pumps come with a replacement plug for the fuel pump. Make sure you use it if yours did as there have been lots of problems with the wiring plug being damaged due to the high current draw of the fuel pump.

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Is there a fuel pressure regulator if so where is it located or is the fuel pump the only source of fuel pressure


Hi Richard, Im AL the owner of Big As Auto Repair.

Richard, the fuel is to create the fuel pressure that is needed. But, the pressure regulator is only to keep the correct pressure at the fuel rail. On almost every vehicle the pressure regulator is either on the fuel rail "OR" on the fuel pump module inside the gas tank. If you have no fuel pressure I would suggest checking for power and ground going to the fuel pump in the tank before buying any part. Because if you have power and ground at the pump then you will need a new fuel pump. If you don't have power and ground at the pump. You'll need to check for blown fuses and swap the fuel pump relay for one that is the same type in the fuse block. Hope this helps and please visit my auto-repair-website and give me thumbs up. http://www.bigasautorepair.com/

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3 Answers

Fuel pump wont run with key in on position,only when its cranking.


You know that how?

What testing told you that?

I would only be guessing (that is all we do here)

But it sounds as though the ignition switch is worn
& effects the fuel pump circuit, when in the on position,maybe!

Get yourself a wiring diagram & see how the system should work,
then test it at different points that are accessible

Jul 16, 2014 | 2000 Hyundai Elantra

1 Answer

No power to fuel pump fuse


yes it is a way round.a faulty relay is your problem.

Apr 15, 2014 | 2000 Volkswagen Passat 4Motion

1 Answer

I have 2000 Kia spectra. It shut off while ideling. I have changed the fuel pump and checked fuses/relays. We used a insulated wire and ran it from the battery to the fuel pump relay fuse socket in the...


You need to troubleshoot the relay and terminals. First try a different relay. Another relay in your car may be same part number relay as you pump relay, so check for that. Swap in a known good relay and try it.
If no help, look at relay. Is it 4 terminal or 5 terminal? If 4 terminal, easier to check. One terminal will be your power source, and hot at all times, so check for that-use your jumper wire (if no testlight or voltmeter), stick end in terminal and just touch metal, looking for spark indicating power. If no terminal has power, maybe only hot with key on, so turn key on and check for power. If no power, the feed from battery to fuse block is lost. If you have one power source, another terminal will be to the pump, the one you turned pump on with. Terminals 3 and 4 will be the signaling source to turn relay on through coil side of relay, and a terminal to ground, also on the coil side of relay. If you have constant power on one terminal, check for the signaling power. When the car is cranking over, the signal terminal should be hot-the signal will be coming from engine computer. So when cranking, relay socket should have two hot terminals. If you don't have two, you're right, relay is not getting correct power to the fuse block. BTW, don't use jumper wire to check for signaling source, use a testlight. Don't want to cause spark from computer wire.
What is EGI? Not familiar with that.

Jan 07, 2013 | 2000 Kia Spectra

1 Answer

1991 subaru legacy sport (turbo). Electrical fuel pump issue. the pump works, used an external 12v source with pump removed from vehicle, currently reinstalled. battery is charged, (sbfd fuse #2) is...


Hi,
if there is no power coming out from the relay, that will be the problem. as you said it is new,check it manually by connecting the terminal into the power source and check the continuity of the the output from the source.
Sometimes there is new parts that has a manufacturer defect. try another relay.

Hope that helps you out!

Aug 14, 2011 | 1991 Subaru Legacy

1 Answer

I changed my fuel pump on my 1993 Chevrolet k1500 & now it won't work? I even changed the tank, pigtail, fuel relay... ect...now it does'nt have any power source from the fuse inside the hood 20 amp as...


Check both sides of the fuse. No power at either side? Go back to the relay as that is where the power comes from. Double check that you are looking at the correct relay.

Jul 12, 2010 | 1993 Chevrolet K1500

1 Answer

00 jeep grand cherokee fuel pump is not getting no fire. checked the fuse breakers even changed the computer. still no fire to the pump


When you state "checked the fuse breakers" did you check for power at the fuse block. Start checking power from the fuse box, then check for power at the end that plugs into your fuel pump. The switch will have to be on for the power to be present. My main concern is, if the fuel pump went out. But it's easier to check for the power first. If you're getting power from all sources, then the fuel pump has went out most likely.

May 11, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Fuel Pump wiring


If I understand right, I would say the normal ground for the pump is bad.
"I am guessing the pump uses a ground source to start." well, just the normal ground like for any motor, you have the power wire (gray) to the pump, then the ground wire for pump, does it branch off near the tank and find a ground? Or does it go into the tank connector and then routed back somewhere through the wiring harness? Anyway, it has to go to ground somewhere. You have the wiring right it sounds,. just make a good ground source, or find the original ground and repair it.

Mar 14, 2017 | 1999 GMC Sierra

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1988 subaru gl 1.8..no power to fuel pump, fuses and links are good. pump works fine with power probe, just not getting power to it..diagram shows black and yellow wire to pump. it is in fact a blue...


The blue wire changes to Blue/White. It gets power from the Fuel Pump Relay. Fuse number 11 is the power source. The relay is up under the dash panel, blue connector

Nov 04, 2009 | 1988 Subaru GL-10

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