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On start

Tiny
SHADYBOB
  • MEMBER
  • 1999 MERCURY COUGAR
  • 120,000 MILES
Couldn't here fuel pump. Checked shut off, relay, fuse, replaced fuel pump
still can't here pump and no start. Car ran fine before parked. I just
replaced rotors and brakes, oil filter and oil. Then no start.
Friday, March 2nd, 2012 AT 10:01 PM

14 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Which engine do you have?

Did you test the fuel pump relay power supply to pump to see if you are getting voltages?
Did you check the fuel pressure?
Have you checked for sparks?
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Friday, March 2nd, 2012 AT 10:48 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Switched relays in power box for one I knew worked. Unless the relay power supply is different than just the relay. Yes got spark at plugs. Didn't chesk pressure figured none since the pump won't come on. Sorry, thought I put in car profile 2.5 v6 built before 5/25/99. Back before I changed pump I tried to start
couldn't hear pump then got in later turned switch heard pump and car started stalled out, haven't heard pump since and no start.
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Saturday, March 3rd, 2012 AT 1:13 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Since vehicle started and stalled then fuel pump did not work again, did you check the fuses and power supply to the fuel pump or relays?

Get a test light or DVOM to test the power supply.
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Saturday, March 3rd, 2012 AT 1:39 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Not shore if we aren't going in circles. Yes, checked fuse, pump relay. Don't know of anyother power supply?Did all the checks before changing pump because thay were all good. Check afther and
fuse and relay are good. Also don't forget I checked fuel shut off switch. Alarm system indicates it is working properly.
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Saturday, March 3rd, 2012 AT 5:11 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you test the power supply to the fuel pump. We need on know if it is power supply that is missing and from what point.

Unplug the fuel pump relay and test for battery voltage at the terminals.
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Sunday, March 4th, 2012 AT 3:40 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Yes, I checked power to the pump and battery voltage to relay terminal. For some reason I just started getting power to pump off and on and when I could here power to pump it the car would start. Afther starting a couple of times starting now I seems the pump comes on all the time and car starts everytime so far!
Thank you for your help. Going to leave a small donation. Thanks again. P.S. The only thing I can figure is even thou I hade jumpers from a nother car the battery had to get charged up also?
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Sunday, March 4th, 2012 AT 7:03 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the charging of the alternator.
Ensure the main wire to the alternator is good as it can cause a non charging condition whereby the alternator is providing output but is not getting to the battery. This coud be due to a loose connection between the battery and alternator or the fuse.
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Sunday, March 4th, 2012 AT 7:11 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Ok. Believe the battery is getting week from being old and was low from sitting for most of winter.(Don't drive this car in winter)but again good advice will check. All ready had to put 3 alternator on this car.
Thanks
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Sunday, March 4th, 2012 AT 7:23 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If you have abnormal squeaking noise from the belting area, check the harmonic damper as a bad one can cause non charging due to alternator running below required speed when the outer pulley is freewheeling on the main pulley.
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Sunday, March 4th, 2012 AT 7:32 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Sorry. One thing I wanted to advise you of, the access hole under
seat is a 4 1/2" hole and the fuel pump assembley is 5 7/8". No way to get it out of hole. Either you make your hole bigger or drop the tank. The hole is just to access the electric and fuel lines to drop tank.
Thanks
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Sunday, March 4th, 2012 AT 7:36 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Wonder how engineers thinks at times, lol.

With so many years on the job, I have always cursed at them for the stupidity of their designs.

Japanese engineers gets much less cursing from me though.
They are more thoughtful to the mechanics where repairs jobs are concerned.
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Sunday, March 4th, 2012 AT 7:43 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Yea, you would think they would make a 6" hole instead of 41/2" not that much diff. No sound from harmonic pamper. Heard this car is known for going throu alternator. Also the old fuel pump I took out was bad also.
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Sunday, March 4th, 2012 AT 8:05 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Ok, hope the problem has been resolved. If the problem is intermittent, I would suggest checking the connectors at the fuel pump again. Ensure it is secure and check the ground circuit too.
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Sunday, March 4th, 2012 AT 8:10 PM
Tiny
SHADYBOB
  • MEMBER
  • 8 POSTS
Ok. Thanks
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Sunday, March 4th, 2012 AT 8:38 PM

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