Do I pull this to depressurize the fuel system in this 2003 Mercury grand marquee?
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Aug 15, 2026 at 12:15 PM
Depressurize fuel system?
2003 MERCURY GRAND MARQUIS
JJAMES60
- MEMBER
- 16 POSTS
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JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,228 POSTS
Hi:
According to my manual, there is no need to depower the pump. Instead, they recommend using a fuel pressure gauge with a manual valve. Once it is connected, you open the valve and allow the fuel and pressure to evacuate into a fuel container.
I attached the directions I have and the pictures. Take a look and let me know if this helps.
Take care,
Joe
See pics below. Note: If you don't have a pressure gauge, many of the parts stores will lend one to you.
According to my manual, there is no need to depower the pump. Instead, they recommend using a fuel pressure gauge with a manual valve. Once it is connected, you open the valve and allow the fuel and pressure to evacuate into a fuel container.
I attached the directions I have and the pictures. Take a look and let me know if this helps.
Take care,
Joe
See pics below. Note: If you don't have a pressure gauge, many of the parts stores will lend one to you.
Images (Click to enlarge)
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Aug 15, 2026 at 9:05 PM
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