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2000 mercurt grand marquis

.Fuel pump fuse good. Fuel pressure good 35psi Tested Fuel pump relay according to the "Chilton Manual 26180" According to the fuel system test... installed a jumper wire into the fuel pump relay terminals that power the fuel pump (per foto). Listed for fuel pump to turn on (it did) ..book says "if you now hear the whirring sound, the fuel pump relay or its control circuit is faulty." Switched PCM power relay, fuel pump relay and air conditioning relay . Drove car and started and stopped engine in driveway dozens of time to get it to fail. No failure. #2 Drove car. Started engine and stopped engine dozens of times in driveway and after some time starting engine and stopping engine got car to not start. Fuel pump not on....no sound. Fuel pressure gauge ...no pressure. Car wont start. Pulled fuel pump relay and installed a jumper wire into the fuel pump relay terminals that power the fuel pump according to book. This time fuel pump did not turn on. According to the book "If there is no whirring sound ,there is a problem in the fuel pump circuit from the relay panel to the fuel pump,defective power relay or a defective fuel pump". Replaced pulled fuel pump replay...turned key... fuel pump did not turn on. Turned key to try and start dozens of times and after lots of tries fuel pump now on ...pressure in fuel line ...car starts. Got any ideas?

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  • Ford Master
  • 12,158 Answers

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 .

Posted on Mar 01, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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stormbrewin
  • 426 Answers

SOURCE: 1996 mazda mx6 ls cranks but won't start

you may need to run a wire from a keyed ignition source that has power while cranking and running to the fuel pump relay and bypass the pcm to test wether it will run, if it runs put a more permanent wire in place.Not too sure what tests youve done but it seems that fuel is what your focusing on so a quick test is too spray engine start up the intake tube to see if the engine trys to run if it does it eliminates a lot of other potential reasons for a no start condition.Also try squeezing the fuel return line to see if the added pressure will try to make engine run.Could be time to replace fuel pump etc anyway let me know how it goes good luck with it

Posted on Dec 12, 2008

godspeed808
  • 125 Answers

SOURCE: 98 Honda Accord Wont Start

either have a shop scan it for trouble codes or buy a scanner your self at local parts store have OBDII scanner and find out for your self it could be a number of things.

Posted on Feb 26, 2009

daves944
  • 1050 Answers

SOURCE: Buick Regal dying

You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

  • 76 Answers

SOURCE: 1998 Jeep Cherokee - Cranks, but "No Start" condition

this could be a bad pressure regulator that is what sends the signal that kicks in your relay

Posted on Jun 27, 2009

  • 1 Answer

SOURCE: Fuel pump problems

you have a shut off button in the trunk find it turn it off and turn it back on

Posted on Nov 25, 2009

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