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Fuel pump has no power works when I wire it directly to battery

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Fuse or relay for full pump

Posted on Apr 30, 2015

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Posted on Jan 02, 2017

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1 Answer

No power to fuel pump on 2000 kia sportage


The only way is to trace the wiring to hunt down that short. Just ck the wiring every few feet until u narrow it down to see where your losing your ignition power. Good luck

Apr 07, 2017 | 2000 Kia Sportage

1 Answer

My new fuel pump only primes when wired direct?


Well you need to get out the DVOM - digital volt ohm meter an check for battery voltage at the fuel pump relay ! if you replaced it you saw the holes it plugs into in the relay / fuse box ? Put you volt meter on the 20 volt scale , hook the black lead to the battery negative or a good engine ground an take the red lead an touch - don't stick it in an spread the terminals . Two of the holes should have battery voltage ,if not check the EEC power relay ! If you find voltage at two holes change the meter to ohms , leave the black connector on a good ground an touch the red to the two holes left , one should be open or OL on the meter , this is the control side from the engine computer . the last hole should show a few ohms resistance , this is down through the wiring to an through the fuel pump to ground . You have two different wiring circuits , control an load side , load side being power to the fuel pump an control side is power an the engine computer supplying a ground energizing the relay closing the contacts in the relay sending battery voltage to the fuel pump. Test don't guess !

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1 Answer

Car not getting fuel .


There is only one thing left. The wire connecting to the fuse box or the ground wire from the fuel pump. Try connecting a wire from the + side of the battery to the fuel pump directly. If that works, the feed wire is bad.

Jan 20, 2013 | Cars & Trucks

1 Answer

Dodge 1500 1995 pickup 7.5 volts to fuel pumpwill not start applied 12 volts pump runs book sayes pcm de-energize booth relayes and will not send proper voltage to fuel pump


There is a red and white wire feeding the fuel pump relay from a 30 amp fuse. Both the shutdown relay and the fuel pump relay are grounded by the PCM, so if the fuel pump relay is grounded it should be "on" and providing a direct link from the pump to that fuse.
You should have battery voltage on that 30 amp wire before the relay and then on the dark green and black wire going to the pump.
If you don't have battery voltage coming from the 30 amp fuse, the problem could be before the fuse.
That 30 amp fuse is hot all the time, so it is powered by a fuseable link coming off the battery.

Jun 24, 2012 | Cars & Trucks

1 Answer

1995 safari fuel pump will not work unless directy wired to battery.


you have an incomplete circuit on your wires connecting items mentioned, test light trace it, poor contact on connectors.

Feb 19, 2012 | 1995 GMC Safari

1 Answer

I have no power to the fuel pump , n when i remove the fuelpump relay n use a jumper wire i still have no power at the fuel pump on a 1988 subaru gl wagon 1.8 liter fuel injected


I would suspect that the Fuse has blown, or the wire has been cut? to that supply wire to the pump, try running a lead directly back to the Positive of the battery and see if that works OK? If so locate and replace the fuse, and or fix the broken wire.

Sep 10, 2011 | 1988 Subaru GL-10

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

1 Answer

1988 toyota 4 runner, 4 cylinder, fuel pump in tank doesn't work unless I hot wire it from the battery. Rear window doesn't go up or down , No 4 way flashers.. Any suggestions ?


check the power source going to the power on vehicle wiring'''CAUTION'' dont hot direct from battery with pump in tank short circuit can cause fire ''check that wire

Sep 11, 2009 | 1988 Toyota 4Runner

2 Answers

86 e150 w/FI 5.0. no power to fuel pump system.


If pump does not work when power is directly applied, then pump will need to be replaced. Have you tested the power from the fuel pump relay?

Aug 24, 2009 | 1986 Ford Econoline

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