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Fuel pump quit working, dropped the tank and removed wiring harness, have 1 ground and three other wires. When ignition is on two wires have 12 volts the third bigger green and black wire has nothing. When I turn the engine over, same thing. Is this bigger wire controlling the pump and if so where do I start

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Hi. That big green and black wire is the ground wire. J.

Posted on Jul 10, 2010


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I'm not getting fuel out of the pump but have 8.6 volts on three of the wires at the pump 87 pathfinder

Assuming it is an in-tank fuel pump, the fact there are three wires would suggest it is a combined pump and fuel gauge sender. 8.6 volts between the fuel gauge wire and ground is a realistic figure but is insufficient to operate the fuel pump.
The fuel pump needs a good ground and a feed of 12 volts but for safety reasons power is only supplied to the pump during cranking and when the engine is running. The pump of some cars does run for about 2 seconds when the ignition is switched on.
Unless the fuel pump relay is removed and the terminals are bridged so a constant supply of power is provided at the pump it is very difficult to check the voltage.

It is relatively easy to test the pump by connecting it directly to a known good battery, taking all appropriate safety precautions.

If the pump tests ok the fault is possibly the relay, wiring or connections or perhaps the fuse.
It would be a good plan to check the fuse first.

Oct 04, 2015 | Cars & Trucks

1 Answer

I have a 97 gmc sierra 5.0 it wont start it has less than 12 volts of power on pump wire

What do you have coming out of the fuel pump relay ? The connector at the tank includes the ground wire for the gauge which is about 7 volts. Make sure you are checking the right wire.

Aug 24, 2014 | Cars & Trucks

1 Answer

ASK SEARCH HOMEANSWERPROFILESIGN IN Problem with 1988 Dodge Ramcharger 1988 dodge ramcharger 5.2 liter. no fire or fuel.replaced computer and coil still no fire or fuel.jumped 12volts from battery to...

Without a voltmeter and a wiring diagram, you're in a bit of a fix. But I would be wondering why the ignition switch isn't sending power to the coil primary positive terminal, and why it isn't causing the fuel pump to be turned on, too.
Is your check engine light on with key on? The computer should sense ignition is on and briefly turn on the fuel pump through the fuel pump relay, on just long enough to pressurize the fuel line to the injector. But no fuel or fire-you'd better start by checking if the ignition switch has power in and power out, and work your way to the coil.

Nov 21, 2013 | Cars & Trucks

1 Answer

1999 GMC Sierra, no power to fuel pump.

99 GMC Fuel Pump Problem Solution

After a long 3 day search for a SOLUTION, I FOUND ONE that might work for those who have tried everything else and still nothing.
This does require the pump being out of tank. Disconnect neg battery cable before you begin and ALWAYS keep 2 or 3 fire extinguishers close by for ? :) I'm not a writer, so this may or may not make sense. But it worked. This may void warranty if you have one.

I bought a new fuel pump and it worked for a little while then quit. I checked the ground found it to be tight, got new relay, changed fuse, and took all the steps that we all take. I was getting 12 volts to the gray wire, and was getting volts to the purple wire at the new oval plug. When I hooked a hot wire to (gray) and a ground to the (black) on the actual pump itself it would work. NOTE: Here I'm not talking about the new wireing harness plug that they request you change. That harness/plug works fine.. The problem I found was the voltage was NOT passing through the plastic connector that is attached to the top of and the underside of whole pump that has the 4 prongs inside. So by taking the connection loose where the four wires from the actual pump and sensers connect to the fitting on the underside of the whole pump (you have to be careful with this part write everything down before you begin just in case) I seen that the little wire ends had very big openings for the prongs to fit in. I squeezed the ( wire ends) together ((Just a Little)) and spread the prongs out just to give it a tighter fit and plugged it back in, then I plugged my new oval looking harness/plug in reconnected neg battery cable and gave it a try( you can test it before you put it back in tank but Do Not test more than twice!.) and it is working again. Hopes this helps anyone who has tried everything else. :)
-Brian G

Jan 14, 2012 | 1999 GMC Sierra

1 Answer

Fuel pump not coming on,installed new one, white plug that has a yellow wire has 5 volts and ground is ok the 2 wires in the center shows 0

The plug you are referring to is probably the fuel tank pressure sender not the fuel pump. It would be plugged into a black sensor about 2 inches long pushed into a rubber grommet on the fuel bung. The fuel pump connector would have more that 2 wires going to it. most likely a heavy purple wire would be the power to the pump. It has to have 12 volts to it to work. The sender may have 3 wires, 5 volts, ground, and sense. the pump connector would have 12 volts, ground and 5 volts for the fuel gauge sender down in the tank.
If the 12 volts is not there, check the fuel pump relay. it is usually up on the drivers side firewall.
With the key in the on position without starting the engine, you should have 12 volts to the pump for 3 seconds then it will click off. Without cranking the engine you should be able to locate the relay by the clicking sound.
There is also the obvious, like checking the fuel pump fuse.

Jan 11, 2011 | 2003 Chevrolet Avalanche

1 Answer

Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.

Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

Oct 13, 2010 | 1999 Buick Park Avenue

3 Answers

It seems i am not getting any power to fuel pump, replaced pump still no power dont hear pump turn on at key on position check relays but not sure on good or not

Replace the oil pressure switch for the third wire on that sends 12 volts to the fuel pump upon turning the ignition key on to prime. Once oil pressure is achived the computer shuts that circuit off and turns on the fuel pump relay to power the pump till you shut off the engine

Jul 13, 2010 | 1997 Chevrolet S-10 Pickup

1 Answer

1996 f150 fuel pump

You may have a break in the wire inside the tank to the fuel pump. I have seen the wires disconnect as the pump is installed.
RPM Northwest

Jun 10, 2009 | 1996 Ford F150 Regular Cab

1 Answer

On my 1994 plymouth voyager the 3 wire harness to fuel pump (blue wire) doesn't have 12 volts; should it? fuel pump quit then worked once when hot-wired with 12 volts. fuse and relay is good.

The wire should not be hot until the relay is triggered. The relay does not get triggered until the ignition key is turned on. It will run for 3-5 seconds or until the system pressure it at max.

Apr 26, 2009 | 1999 Plymouth Grand Voyager

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