Question about 1990 Mercury Grand Marquis

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Fuel pump relay location on a 1990 mercury grand marquis.

My car wasnt recieving any fuel to the engine so i replaced the fuel pump. i tested for power going to the fuel pump and my meter showed no power. i was told to replace the fuel pump relay. i just dont know the location of it. if you have any other suggestions on what could be wrong please tell me.

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Check the fuse .if the fuel pump was bad you blew the fuse . there is a inertia switch in the trunk or under the dash you could check . push the red button to reset relay should be under the hood in the fuse box check your book if you have one.

Posted on Nov 19, 2008

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I have a 97 sebring that wont turn over. I sprayed starter fluid in the intake and it turned over, so i changed the fuel pump, the fuel filter, and the relay. What else could it be?


Is the PCM - engine computer energizing the fuel pump relay ? The best place to test the fuel pump electrical circuit is at the relay , using a test light or volt meter were the relay plugs into. On the bottom of the relay there should be numbers 30,87 an 85 an 86 . 87 an 30 are the fuel pump side of the relay . 85 an 86 are the control or turn on side of the relay . Two of the pins should have B+ voltage . One will be open an the other will show ohms resistance on ohm meter . Find a wiring diagram at http://www.bbbind.com/free_tsb.html an test for power an control of the relay . Test don't guess an don't be a parts changer , Fuel Pump Electrical Circuits Description and Operation

Jan 26, 2016 | Cars & Trucks

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 !

May 25, 2015 | 1987 Ford Ranger

2 Answers

1990 Mazda Miata will crank but not start. Just replaced battery, spark plugs, and air filter. I used some starting fluid in the air intake and the engine started so I believe its a fuel problem. I tried...


Not sure what you are using as a ground when checking voltage. If you check at the connector you should have 12 volts at the blue wire with the red stripe (red prong on volt meter) and you can check putting the ground/black prong on your volt meter on either one of the black wires on the connector. When turning the key just to the on position you\'re only going to get full power for about 2 seconds unless you\'re turning the engine over. If you\'re not getting full voltage try putting the black prong (leaving the red one from meter on the terminal that has the blue wire with the red stripe) using a good ground on the body of the vehicle (the black prong from meter). Now if you\'re getting the voltage you need then you need to trace the black wire(s) to where they are grounded out on the vehicle and clean/tighten and repair the ground as well as making sure you are getting zero continuity from where the ground is on the body to the connector at the fuel pump. A bad ground will cause weak power. These are also the 2 wires you need to apply direct power (on the pump side of the connector) in order to check the pump as you asked. Since there are 2 black wires at the connector, if you have direct power to the blue and red wire and put your ground on one of the black wires and it doesn\'t run, than try using the other black wire (or where it would be on the terminal of the connector...pump side) at the connector because that would mean you are testing the wrong ground wire for the pump itself. If your ground is good down there and it turns on when applying direct power than it could be a number of things but the 2 most common would be the fuel pump relay or the air flow meter/sensor. Start with check power and ground and direct powerfirst. If the pump is working when putting direct power and your grounds are good then further testing needs to be done of course. I\'ll be happy to help you with further testing if needed like checking the relay and/or air flow meter. You will need an ohm meter for further testing. I hope I was detailed enough for you to understand the testing needed at this point and I hope I was able to help

Oct 12, 2013 | Cars & Trucks

1 Answer

How to test a fuel pump relay in a 1999 toyota tacoma


Most relays have a diagram on the side showing the terminals by number.
You would take a test light or meter and check the terminals in the fuse box for power and ground. You should have two power wires, one ground from the computer, and the circuit to the pump. Keep in mind the computer grounds the relay for only 3 seconds if the engine does not start.

Sep 15, 2012 | 1999 Toyota Tacoma PreRunner

2 Answers

Replaced fuel tank and pump and now car won't start.


no engine stated.
details are based on that..
so is it still the old pump there,
this is very simple
using a volt meter. (the pump has 2 wires, measure across those)
back probe that connector to the pump. 2 pins.

12vdc cranked, if you have 12vdc cranked
but fuel pressure is 0 the pump is gone
no pump runs on 0v, or 6v, its 12vdc there,
i can not understand those fues tests
if the voltage fails to the pump it can be
the power wire or ground wire failing .
do all tests connected, or the readings will be useless.
connected is live testing, under full real conditions
and win. every time.
if ground is tested and rises to 12vdc cranked, ground is bad.
only Ohms laws here,a simple equation.

not sure why your float fails. my guess its bad.
and easy test using ohms, disconnected.
that is another problem.

ill look at your fuse, pretend V6 engine.

the service manual shows
f10 fuse is fuel pump
12vdc both side cranking is a GOOD FUSE.
note all words above.
F10 gets all power from pump relay,
so if you dont crank the relay can be off line
an F10 will be dead.
(the schematic is clear)

here is a facts on all cars, next (pure software in PCM )
  1. pump only runs 3 seconds key on, ,
  2. pump never runs, if not cranked.
  3. run cranked and all run if engine stays running.

see? and varies by year, engine, and even ECU upgrades
so a SAVVY mech always cranks to do tests.
that means its a 2 man job. sorry but that is a reality of working any car until you learn what yours does.
warning have a care here that changes rule 1 to 2, below 20F out door temps, (fun no?)

recap
crank and measure like this.
the pump has 2 wires, red hot, black ground
meter across, pins 1 to2, red back is 12vdc cranked
meter black tests lead (volts) to body perfect metal ground
and meter red lead to pin1 red shows, 12vdc cranked
12vdc means 10 to 12vdc cranked, (battery does that)
then move red test lead to pin 2, black
cranked, 0v, if see 1 volt or ore the ground called.B26 is bad.
if the pump has 12vdc on it, you hear it,
do not run it dry its fuel cooled and fuel lubricated or you wreck it.
if it is heard to run you then see fuel spec fuel pressures.
or its bad. (30psi?)



pump-f2pntdp44mjusq0choqk2alv-3-0.jpg


pump-f2pntdp44mjusq0choqk2alv-3-1.jpg

Mar 13, 2017 | 1998 Isuzu Trooper

1 Answer

2000 mercurt grand marquis


Not guessing as to what the problem is , testing for voltage drop problems with a volt meter . posted a video on youtube yesterday . If your still looking for guesses forget it , no one on here could say for sure without testing the circuit an hooking up a scan tool to see if PCM is energizing the relay . Do yourself a favor an take it to a qualified repair shop . Fuel Pump Electrical Circuits Description and Operation If you can't learn how to test from this guy , better take to a repair shop .

Mar 01, 2017 | Ford Cars & Trucks

1 Answer

Have no power to run fuel pump


check the fuse indicating fuel pump this will be in the engine compartment. you can check it by taking out the fuse and testing to check if there is continuity with ohm meter. If the fuse is ok check if you have voltage going to the fuse same meter just voltage should be 12v. If yes test to see if you are getting power to the relay. try this get back to me.

Sep 29, 2010 | Ford E-350 Cars & Trucks

1 Answer

Fuel pump had power to it when i took it out,now it dont! HELP!


The FUel Pump only Recieves power for a few seconds when you cycle the key and should be on during crank. I would also make sure the injectors are pulsing by hooking a noid light or a regualr test light to each side of the 2 wirs and check for flashing during crank. Just get it running before you worry about guages. If the fuel guage quit after the pump than either the sender/float got screwed up or it is a wiring issue right above thak or at the connector

Feb 10, 2009 | 1987 Ford Ranger

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