Question about 1987 Nissan Maxima

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No power voltage go to fuel pump motor ? - 1987 Nissan Maxima

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CHECK FUSE +RELAY.IF ALL IS GOOD FUEL PUMP WIRING HAS A OPEN OR BROKE WIRE.

Posted on Oct 04, 2009

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  • Nissan Master
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Check fuses first. If they're okay you have a broken wire somewhere. Did you test it, or you just can't hear the fuel pump running?

Posted on Oct 04, 2009

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2 Answers

Have new fuel relays plus The fuel pump works but not getting power to fuel pump


With a test light make sure there is battery voltage at the fuel relay if not check for a faulty fuse , if voltage is ok turn ignition on , relay should click and there should battery voltage at the cable going to the fuel pump, if not the relay is faulty. now go to the fuel pump and test for battery voltage there while a helper turns the ignition on and off , the computer will turn the pump off after a short while if the motor does not start, if there is no voltage at the pump with this test there is a fault in the cable to the pump.

Mar 04, 2016 | Cars & Trucks

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Need wiring diagram with breakdown of colored wiring on fuel pump motor on 1999 mitsubishi galant ES, 4 cyl


the two thick wires are for the pump and the other two for the fuel gauge ,check for voltage at the pump if no voltage then follow the wires back to see if their is a connection somewhere ,also check the earth connection if no power in the two wires ,ie one probe onto the earth and the other to a suitable ground on the bodywork ,then continuety

Jan 17, 2015 | 1999 Mitsubishi Galant

1 Answer

Replaced fuel pump motor on fuel pump assembly, reinstalled, have voltage to each of two connectors, but no pump action


You should only have one power wire on the pump and one should be a ground are you sure you have power on both?

Jan 05, 2015 | 1998 Mitsubishi Galant

3 Answers

I have a 1988 ford f150 and have non power to the fuel pump


Sounds like the relay has gone bad (common problem on these trucks) there is no rebuild so you have to replace it (around $10) located under hood, passenger side, by air cleaner you'll see a bank of little "boxes" the fuel pump is the green one. Just go to your local parts store to get the replacement. You just unplug the old one, and plug in the new one. Do make sure the key is OFF when you do it.

Jan 04, 2015 | 1988 Ford F 150

1 Answer

Any way to test if fule pump is working on a 1992 ford f- 150?


Cycle the ignition switch --listen at fuel tank for pump

Check Fuel Pressure at motor with a gauge

Check Fuel Pump Fuse

Check Fuel Pump Relay-test it or switch it will same type

Check with amp clamp or scope- anywhere in the circuit
you can get to

Check with voltmeter for voltage drops on power side
& loss of ground on body side

Power the pump from the relay

And several other ways to go about fuel system issues

Aug 16, 2014 | Ford F-150 Cars & Trucks

1 Answer

1999 Mercury Grand Marquis. with KOEO, voltage to fuel pump is 6.58 volts. Battery voltage is 12.47 Vdc. Removed fuel pump and installed jumper wire and fuel pump receives battery voltage. Why is voltage...


With my pump failure, I read the exact same 6.5 v at the inertia switch in my trunk with the key in the "on" position and engine not running or cranking. When cranking, the voltage to the pump jumped to +12V and if the engine did run, the voltage should stay at +12V.

The Ford manual states +12v should be at the motor for some number of seconds in the key "on" position then drop off if the engine is not cranking or does not start. In my pump failure case, I never saw 12V at the inertia switch in just the key "on" position, only +6.5V as the +12v fuel relay under the hood never engaged and/or stayed latched on.

In my situation, I measured an open circuit at the pump motor winding and suspect the +6.5V I was reading came from the Powertrain Control Module. I am also guessing if my pump winding was not open, the +6v voltage would have been +12v for a number of seconds for fuel priming as the fuel pump relay is temporarily energized, then drop to zero (relay off) if the engine does not continue to crank or run.

With my pump motor winding open, the Power Control Module may not have been loaded properly to function (reading +6.5 floating volts instead) in the key "on" position and therefore never climbed to the full +12V. There obviously was no fuel pressure at my schrader valve on the fuel rail when cranking which indicated an open wiring circuit (splice, ground or connector) or open pump winding. The 12v I was reading when cranking at least indicated the fuel pump relay was working.

With my new pump installed, I listened for the pump running in just the key "on" position. I believe I barely heard it running after the repair as it was running very quietly which indicates the +12v was there which supports my theory.

Dec 13, 2010 | 1999 Mercury Grand Marquis

1 Answer

Open circuit-EEC to motor ground? What! no power to fuel pump. 1993 Ford Explorer 4.0L


check fuel pump ground wire for clean wire to frame contact also check fuse and relay, jump power across relay to force voltage to the pump with pump relay out.

Feb 28, 2010 | 1993 Ford Explorer Limited

1 Answer

1991 chey pick up 1500 electric fuel pump


Hello, Only 2 wires show be hot when fuel pump power is supplied. I think that the gray wire is the power side so ck that wire to ground. Also, fuel pump power is supplied from your oil pressure switch and the fuel pump relay only supplies power for a few seconds until the truck is started. Keep in mind that the fuel pump will only run a few seconds by just turning the switch on. If you want the pump to stay on without the motor running , you will have to by-pass the fuel pump relay.
I hope this will help.
CYA, gator241

Feb 06, 2009 | 1991 Chevrolet C1500

1 Answer

1996 izuzu roeo electrical


check alternator:

There are 2 connectors on the alternater. The round one has 3 wires. If there is no voltage on the green wire when the engine is running the alternator is bad. I'm not sure what fails internally but the alternator can put out fine charging voltage on the main black lead and not have voltage on that green wire. That wire is a trigger for the fuel pump relay. Voltage goes to the main power relay then to idiot lights in the dash then back to trigger the fuel pump relay. Along the way it goes in and out of the oil pressure switch(sender at the back bottom of passenger side of block with 2 yellow wires). This switch cuts voltage to fuel pump if no oil pressure. The green wire from alt is a safety in case of collision ect. Engine not running> no alt voltage on that wire>no fuel pump pressure>no fire. If this wire is bad it will not show up on the standard auto store test. And is a common failure. I had an brand new Isuzu rebuilt OEM alternator that was bad like this.

Dec 06, 2008 | 1995 Isuzu Rodeo

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