10.0

really awful
Typical Repair Cost:
No data
Average Mileage:
39,527 miles
Total Complaints:
1 complaints

Most Common Solutions:

  1. re-engineer fuel pump (1 reports)
2003 Mercury Grand Marquis fuel system problems

fuel system problem

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2003 Mercury Grand Marquis Owner Comments

problem #1

Dec 202005

Grand Marquis LSE 4.6L

  • Automatic transmission
  • 39,527 miles

A D V E R T I S E M E N T S

THE ELECTRIC FUEL PUMP ON MY 2003 MERCURY GRAND MARQUIS FAILED WHILE MY WIFE WAS DRIVING DOWN A MAJOR THOROUGHFARE WITH HER DISABLED ELDERLY PARENTS. THE FUEL TANK WAS FULL OF GAS. THE VEHICLE HAD 39, 527 MILES ON IT. THE COST OF REPAIR WAS $525.27. APPARENTLY THE PUMPS HAVE TO BE EXPLOSION PROOF, BECAUSE THEY SIT IN THE GAS TANKS. FROM WHAT I HAVE HEARD, THERE IS A PLASTIC PART THAT SHEARS OFF. A MECHANIC AT MERCURY TOLD ME THAT IT IS IMPORTANT NOT TO LET THE FUEL LEVEL DROP BELOW ONE QUARTER OF A TANK. I HAVE HEARD THAT IF THE GAS GETS TOO LOW IN THE TANK, THE PUMP BEGINS TO CAVITATE, CAUSING A STRAIN ON THE DRIVE MECHANISM. THE PUMP SHOULD HAVE BEEN DESIGNED SO THAT IT DIDN'T CAVITATE, AND SHOULD HAVE BEEN MADE WITH BETTER PARTS.

- , Agoura Hills, CA, USA

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