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#800647 - 10/15/05 08:36 PM 1999 Grand Marquis will not start.
zephyr Offline
n00b

Registered: 12/09/04
Posts: 26
Gentlemen

My mother in laws 1999 Grand Marquis 4.6 V8 will not start. Engine cranks at normal speed. The fuel pump is not turning on when the key is turned. Fuse is good, fuel pump relay was switched with a known good relay out of my car (1998 Grand Marquis), power is getting to the relay, I even bypassed the relay with a jumper wire sending power directly to the pump, nothing. Inertia switch has not tripped shutting off the pump. There is no pressure at the fuel rail. At this point I believe the fuel pump has failed. The car has 48,000 miles on it and is on its second pump right now. Fuel filters were replaced with each new pump. If this pump is bad that makes it three. I gave it a quick shot of ether while cranking and it started momentarily. I try to avoid using this stuff for obvious reasons but I needed to know if it was getting spark and it was. She has never run her fuel tank lower than ¼ and her local Ford dealer has always repaired this car. Am I on the right track here or is something else happening with this car? Can the PATS system shut off the pump in this manner? Was there a fuel pump problem with these cars? Would appreciate any advice before she gets it towed Monday morning. Is there something that I missed? Thanks!

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#800648 - 10/15/05 08:48 PM Re: 1999 Grand Marquis will not start.
gord_bolton Offline
Over the Hill

Registered: 05/06/02
Posts: 4691
Loc: Saskatoon, Saskatchewan
It is always a good idea to check the wiring and connections at the fuel pump. If there is power at the pump and the pump won't pump then you need a new pump. You can try hitting the tank with the key on to save a tow.

Fuel pumps can last a long time or fail prematurely.

I would not use ether on a gasoline engine. A little squirt of gas down the throttle body will tell the story or checking the fuel pressure at the valve.

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#800649 - 10/15/05 10:08 PM Re: 1999 Grand Marquis will not start.
Fordiesel69 Offline

Over the Hill

Registered: 09/16/05
Posts: 4399
Loc: Erie, PA
Sounds like your on the right track. Get a quality ford pump not a chinese one from AZ. But then I recall you said the dealer did the work. Would they be using a new pump or a reman?
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#800650 - 10/15/05 10:58 PM Re: 1999 Grand Marquis will not start.
johnnyiroc Offline
Over the Hill

Registered: 10/14/02
Posts: 4064
sounds like a pump to me. I second check the voltage if any at the pump its self. Maybe it is low, causing the pump to draw more current and heating up the pump to make it fail too soon, but still provide enough to run it until it fails? Just an idea.
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#800651 - 10/15/05 11:06 PM Re: 1999 Grand Marquis will not start.
zephyr Offline
n00b

Registered: 12/09/04
Posts: 26
Good idea, I'll check for power back where the wiring harness connects to the pump and rap on the bottom of the tank tomorrow. My gut tells me its the pump again but I don't want to rule anything out. Three pumps in under 50,000 miles concerns me though. I was just wondering about the PAT anti-theft system and if it has the ability to disable the fuel pump by interrupting its ground. If it was up to me I would have it towed to my house where I have all the equipment to replace the pump and save her some money but she just hates to bother her favorite son in law.

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#800652 - 10/16/05 02:02 PM Re: 1999 Grand Marquis will not start.
JohnG Offline
Tech Admin
Grand Poobah

Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
It could be PATS, but if it were the THEFT light would be flashing like crazy.
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#800653 - 10/16/05 02:15 PM Re: 1999 Grand Marquis will not start.
Raptor9458 Offline

Over the Hill

Registered: 04/19/04
Posts: 4994
Loc: Chicagoland
Does PATS shut down the pump? I thought it shut down the injectors.
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#800654 - 10/16/05 03:44 PM Re: 1999 Grand Marquis will not start.
JohnG Offline
Tech Admin
Grand Poobah

Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
It really does not matter, but I think it is the injectors. No matter what, if the light is not flashing, that's not it.
_________________________
- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
Save MILLIONS, vote to outsource our Executives!
What happeded to "government by the people, of the people and for the people"?
RIP Ronald W. Reagan "The Great #40"

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#800655 - 10/16/05 06:28 PM Re: 1999 Grand Marquis will not start.
zephyr Offline
n00b

Registered: 12/09/04
Posts: 26
Gentlemen
If I remember right the PATS red LED on the her dash was blinking like crazy when the engine was cranking. I'll ask her to hold off on the tow for another day until I can read up on this system. Guys, I'm on a mission now. I'll let you know what happens. I have this problem posted on two boards to increase my chances of finding a solution.

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#800656 - 10/16/05 06:35 PM Re: 1999 Grand Marquis will not start.
JohnG Offline
Tech Admin
Grand Poobah

Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
Since the light WAS blinking, you have found the problem, no need to look any further.

Try a different key.
_________________________
- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
Save MILLIONS, vote to outsource our Executives!
What happeded to "government by the people, of the people and for the people"?
RIP Ronald W. Reagan "The Great #40"

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#800657 - 10/18/05 10:34 AM Re: 1999 Grand Marquis will not start.
RStocker Offline

Member

Registered: 12/13/02
Posts: 278
Loc: Tulsa, OK
Quote:

Gentlemen
If I remember right the PATS red LED on the her dash was blinking like crazy when the engine was cranking.



My son's 98 GM did that when the transponder fell out of the key head. Started fine with the other key.
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#800658 - 10/19/05 07:56 AM Re: 1999 Grand Marquis will not start.
zephyr Offline
n00b

Registered: 12/09/04
Posts: 26
Update on the 1999 Grand Marquis. Mother-in-law couldn’t find her spare key and wasn’t even sure she ever had one so car was towed. It was in fact a defective key. Two new keys were made and programmed. Thanks for all your replies and help!

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