Question about 2003 Mercury Grand Marquis

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Fuel pump only comes on sometimes.

When you first turn on the ignition switch, the fuel pump only comes on about 6 out of 10 times. Changed the fuel pump and checked the fuses. The fuel cut off switch and connection appears in good condition. I ran the code and it gave 1233, which was no help to me.

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Ford released a SSM (Special Service Message) stating that 2003-2004 Town Car, Grand Marquis and Crown Victoria models may exhibit code P1233 with possible drivability or no start symptoms. It suggests that before replacing a suspect FPDM, fuel pump relay, inertia switch, fuel pump sending unit or PCM, the following things should be checked: Check for a loose PCM pin fit issue. Check for a loose or faulty ground at G101, G103, and G400. Check the FPDM harness located behind the rear seat at the base of the C-pillar for chafed wires on the bracket and check for a circuit or connection issue with the Dark Green/Yellow (DG/YE) wire which runs between the FPDM and PCM pin 40 due to a poor crimp. If all of these items check to be ok, perform normal diagnostics for code P1233.

Posted on Jul 18, 2009

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Hold on juncro. Currently chasing this problem in an '03 Crown Vic squad car. On its 3rd fuel pump, and it still has sporatic no starts, especially when cold. Will post solution when i inspect wiring.

Posted on Feb 06, 2010

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FUEL PUMP IS FAILING

Posted on Jul 18, 2009

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Posted on Jan 02, 2017

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1998 chevy astro van sometimes works, sometimes not.? At timesm rarely, the astro will crank but will not start. Fuel pump not cycling and making its hum noise so I changed the fuel pump with an AC Delco...


When you first turn on the key, no crank, the fuel pump should run for a few seconds then stop. There shows to be an oil pressure switch in parallel with the fuel pump relay. It's just a redundant power supply to the fuel pump. Once it cranks enough to bring up oil pressure and the switch closes, the pump will run even w/o the relay. Both the fuel pump relay and oil pressure switch get voltage from the ecm b fuse.
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I don't know if Yukon's had this problem or not, but once I changed a fuel pump on a Chevrolet Blazer only to find out that then the ignition switch went bad. I changed out the ignition switch and it started fine after that. Please rate my answer so I get my points for it.

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I have a 2003 Pontiac Grand Am. Earlier this year it began having starting problems and I learned that the fuel pump was not turning on sometimes when i put the ignition switch to on. (wouldnt hear it) ...


It is most likely the Ignition switch. I have replaced several for this exact simptoms.
To check it, you test the power for the fuel pump relay.
When the ign switch starts acting up it will not power up the fuel pump relay portion of the fues box.
You can check it with a test light.
On a day when it starts and runs fine, pull the fuel pump relay, turn key on and probe the socket with test light and make note which ones have power to them.
Then one day, when it dont start, dont turn the key off yet, pull the relay, and retest, and compare.
If there is no power where there used to be power, replace the ignition switch.
Hope this helps
If it does please leave some testimony

Nov 09, 2009 | 2003 Pontiac Grand Am

1 Answer

Fuel pump does not come on. If I turn the


either the pump is going bad, your connection to the pump is bad, your fuel filter may be bad, or your fuel pump relay has gone bad. In other words, there are many things to check. Get a test light and go to town. Also check the fuel pump fuse.

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My Kia wants to start but sometimes doesn't.


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Jul 30, 2009 | 2001 Pontiac Grand Am SE

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