Question about Mercury Mountaineer

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I put a new fuel pump in my 99 mercury mountaineer nd it still isnt getting power to the pump in the tank the pump under the hood still works i tried switching the fuel pump relay fuse but im not sure if its the correct fuse besides the fuse what else could it be?

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  • Contributor
  • 7 Answers

It could also be the fuel pump inertia switch has been triggered or fuel pump relay went out. Good luck1

Posted on Mar 02, 2015

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  • Mercury Master
  • 21,873 Answers

What pump under the hood ??
Have you tried jumpering the pump relay ?

Posted on Feb 13, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

chuck943
  • 783 Answers

SOURCE: power windows went out

The power window system operates under the control of the accessory delay relay. For early build vehicles, the GEM will energize the relay to provide power to the power window system. For late build vehicles, the ICM(instrument cluster module) will energize the relay to provide power to the power window system.

Now it does not state the build date cut off in shop manual. So if it is an early build Fuse No.6(60amp) in Battery junction box feeds a circuit breaker that mounts under the hood on the fender apron at the firewall on driver's side(wire colors will be BK/WH and YE/LG).Then it feeds the switch side of the accessory delay relay in the Central junction box. Fuse 17(15amp) in the central junction box feeds the switch side of this relay.

The late build system is the same except instead of the circuit breaker on the left fender apron it uses fuse no. 47(30amp) in the battery junction box.

Now you can go to this website and pick owner guide on left task bar,input your vehicle info and pick get owner guide. Then pick the 6th owner guide printing and go to page 210 for the accessory delay relay location. You will see all the fuse information starts on page 207 thur 216.

Posted on Mar 13, 2009

  • 3 Answers

SOURCE: Don't have owners manual for a 1999 mercury

uoe can retrieve that on line for free All I did was goggle mercury cougar 99

Posted on Mar 20, 2009

  • 134 Answers

SOURCE: 99 chevy s10 replaced fuel

It sounds like you are on the right track. Here are the basics for your pump. I took a guess at the engine size and went with a 4.3 V6, Hopefully that is it.

1. There is an ECM B fuse, 20amp that feeds one side of the relay.
2. You have already mentioned the relay. The other side of the relay feeds from the VCM or Vehicle control module.

Remove your relay and check pin #3.. You should have 12volts with key on. If not check the ECM B fuse.
If you cross pin#3 and #5 on at the relay location you should feed 12 volts to your pump and it should run. If it does not, look for a ground problem on the black pump wire or a broken wire between the relay and the pump. I show a gray power wire to the pump.

Hope this helps.. Best of Luck..

Posted on Aug 21, 2011

skychief2001
  • 21873 Answers

SOURCE: which relay under the dash controls the fuel pump

Only the PCM and the fuel pump relay power the pump.
If the engine runs on starting fluid, we can assume the ASD relay is working because the coils have voltage from it.
You need to check to see if the pump relay has power from a 20amp fuse and a ground signal from the PCM. If it does, and you have power to the pump, the pump has failed.

Posted on Aug 30, 2012

SOURCE: I need the schematics for a 1997 Sunfire from the fuse box under the hood back to the fuel pump. Including the wiring diagram to the second fuse box

i found the schematics on autozone.com in repair guides.

Posted on Dec 09, 2012

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1 Answer

How do i emptythe gas tank on a 2000 mercury mountaineer


Here are two ways:
You can take the filler hose off from the gas tank and put a siphon hose in there. Siphon it into 5 gallon cans.

Another way is to pull off the main gas feed line that goes from tank to the engine. Just find a convenient spot to pull the line apart, like possibly right before the fuel filter. Then you will need to activate the fuel pump to have it push the gas out. The easiest way to activate the pump is to find the fuel pump relay (under the hood in the fuse/relay block) and pull it out. Then use a short jumper wire into the two correct terminals where the FPR plugs in. This will automatically start the fuel pump and you can push all the gas out of the tank.
Most of the time, the two terminals at the FPR will be numbered 30 and 87. Look on the relay for terminal identification. You are jumping the main power feed line at the relay to the line going to the fuel pump. Do not guess, or you could damage your engine computer if you put the jumper wire in the wrong terminal. At the relay, you are jumping the power side of relay. The other terminals at the relay are for the coil side of the relay. Jump the power side!

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Should be a designated fuse for the power to the fuel pump I'm not familuar with this model but some vehicals with electric fuel pumps have a reset swich on the pump or under the hood on the fire wall.

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I have a 99 mercury mountaineer and it ran out of gas after I put gas in it its like the truck just won't kick thegears ovr do u think I need a new fuel filter or a whole fuel tank


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they just stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?

You dont need another fuel tank. Running a vehicle out of gas allows any trash or goo to get in the fuel system. Trash mostly is trapped at the pump inlet screen and in the filter. GOO can make its way into the injectors. Throw in a bottle of injector cleaner. A sure indication of a bad fuel pump is an audible constant change in rpm's. It sounds like it's changing gears.

Aug 02, 2011 | 1999 Mercury Mountaineer

1 Answer

Its about 15 degrees here and my car will not start. i have 2004 mercury mountaineer. It started last night when it was only 9 degrees. What could be wrong? Antifreeze maybe? and if so where do i put it...


Not starting can be alot of things inculding frozen fuel lines or a fuel pump that so cold it won't turn. If it's cranking just fine you might try knocking on the fuel tank to shake the pump. with someone trying to start the car knock on the fuel tank and listen fort the pump. If the battery is too low the pump might not start but the engine may still crank. It might start if it warms up outside and you'll never know what the rerason was. Keeping your fuel tank above half a tank is a good idea too. Try to connect and jumper car to yours and let it charge the battery for awhile then try to start it as the extra voltage might be enough to start a cold pump.

Dec 14, 2010 | 2004 Mercury Mountaineer

1 Answer

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Try to take a look at the fuel fill hose that goes to the tank. Does it look resticked at all?

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1 Answer

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Ever have the fuel pump replaced ? Classic symptom of long crank time ,the check valve in the fuel pump module is bad . Hooking up a fuel pressure gauge to check for fuel pressure bleed off . Fuel bleeds back into the tank. Try spraying carb. cleaner into the throttle an see if it starts sooner ! I would imagine you don't have a fuel pressure gauge to test it the correct way .
Here are Some Tricks to Diagnose Car That Cranks Too Long Before it Starts

Jun 20, 2017 | 1999 Mercury Mountaineer

3 Answers

Engine won't start, turns over, but no fuel


I have a similar problem with my 99 cougar. It will start when I spray starting fluid in the intake and I have gas at the test point but it doesn't seem to make it to the injectors.

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