Question about 1999 Mercury Grand Marquis

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On 1999 grand marquis, cut fuel pump assembly wires 3. On new one, the wires are different colors. How can i find out how to match them up

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Match the location of where each original color goes to the same location on the new pump regardless of color and connect them. GOOD TO GO!

Posted on Dec 18, 2016

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I need a wire diagram to explain how to splice in a new fuel pump to the wire that runs on top of my gas tank on my 2003 mercury grand marquis 4.6 l v8


If the new pump doesn't have a matching connector, it's the wrong pump. Return it and get the right one. You don't want to splice wires to the fuel pump because of voltage drop and corrosion.

Jan 21, 2018 | Mercury Cars & Trucks

1 Answer

Where is the fuel pump relay on a 1999 grand marquis the car will not start car started wit starter fluid so its not a ignition prob the car did start wit a jump wire on the fuel pump shut off switch


The fuel pump relay is in the powerbox on the drivers side of the car. It can be in a relay trio which is hung behind the powerbox and has a slide out access to the relays inside or it can be inside the big powerbox. Usually the cover has the relay name and position embedded in the plastic.

Apr 24, 2015 | 1999 Mercury Grand Marquis

1 Answer

Working on the fuel pump wiring harness for 1999 isuzu rodeo the colors are not matching up with the vehicle wiring harness. delphi fuel pump wiring harness colors are 1. gray 2.purple 3. black 4.blac


USA car?
where are your hands, now.
where is this harness. at , EXACTLY?
my guess , new fuel pump and is the wrong pump?
finding Isuzu parts in USA is hard. after thier departure.
also on allcars pump vary by engine options.
so no engine stated. so cant help much at all.

but if in usa and if your engine is listed here.
here are all the pumps made after market here. in USA
fixing cars is easy
finding good parts is very hard, and takes skill.

gas engines not diesel.
3.6L shown.
https://www.rockauto.com/catalog/x,carcode,1355857,parttype,6256

are you replacing the whole assemblY ? it just a connector on top of rack , no pig tails
but are you replacing the pump ON THE RACK
that different and lots harder.

do say.

Feb 08, 2015 | 1999 Isuzu Rodeo

1 Answer

99 marquis got spark got fuel starts with starting fluid relay seems fine switched


Can you hear the fuel pump come on when you turn the key on? First thing I would check is the fuel cut off switch located in the trunk on the driverside quarter panel.Sometimes this will cut off the fuel if the vehicle is jolted from a pot hole or collision. It's a little black box which may have either a red or black button on it.

Nov 29, 2010 | 1999 Mercury Grand Marquis

1 Answer

I have a 1999 gmc 1500 with fuel module problems there are 2 pumps and i have the other pump. the differance looks like 1 of the plugs on top. i have the plug i would like to make work. they are both 4...


hi, if you bought a new fuel pump assembly you are one of many who had problems with the connectors. so your not alone. the fuel pump manufacturers changed the plug configuration to solve a problem with the existing plug, the plug being replaced is the square plug on the left. the new pump assembly came with the new pigtail and you need to cut off the connector(close to the plug so you have enough wire) and ****-connect the new plug onto the trucks wires. the wires will be color coded to match the old wires, they maybe dirty and oily so you will probably have to clean them to tell the difference. also the pump should come with a diagram to help solve the wire problem.

May 18, 2010 | 1999 GMC Sierra

1 Answer

Harness colors don't match new colors to chng fuel pump connector


i know what you are talking about, last time i looked at the wires on the pigtail i cut off and i determined which color went to each pin location. then transfered my findings to the new pigtail.

Nov 17, 2009 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Fuel issue on 2001 Grand Marquis


most cars have an oil pressure sensor that is tied into the fuel system that will shut off fuel pump if oil pressure is low. Ford is famous for having a yellow fuel pump cut off switch that activates in a collision - you need to locate and check this 1st

Oct 18, 2009 | 2001 Mercury Grand Marquis

1 Answer

99 Grand Marquis Fuel Pump problem


Lets try a new keyswitch and a fuel filter. The key activates the starter side of the ignition. This terminal should power both the starter solenoid and the fuel pump. Although the fuelpump runs on the ignition side continuously, you should be primed when the key is in the "on" position. I would wonder if the pump is cutting off too early meeting the resistance of a dirty fuel filter.

Jun 09, 2009 | 1994 Mercury Grand Marquis

3 Answers

1998 Mercury Grand Marquis Fuel Pump Replacement


you can try just resetting the fuel pump switch located in the car

the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it

in my 98 grand marquis, the switch is on the left side of the trunk

Jan 09, 2009 | 1983 Mercury Grand Marquis

1 Answer

Wiring the fuel pump


THIS 1994 Mercury Grand Marquis Fuel Pump Wiring Diagram41873503.gif Mercury Marquis Fuel Pump IS A 94, BUT IT IS THE SAME FOR BOTH YEARS.

Aug 26, 2008 | 1993 Mercury Grand Marquis

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