Fuel pressure. 97 grand marquis.


Asked by Oct 03, 2016 at 09:25 PM about the 1997 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

New fuel pump. Fuel filter. An fuel pressure
regulator. Idles fine an runs good. As soon as you
smash it it just boggs out the fuel pressure off the
rail is low. No check engine lights.

7 Answers


You've done everything, assuming the pickup screen in the tank is clean, on the pump. Get a new gas cap. Try running it with just a rag in place of the cap. Maybe air can't get into the tank.


Also, replace the fuel pump relay, under hood. They go bad.


Well it runs when you cruise around. No issue 100mph. But as soon as you punch it it just boggs out an low fuel pressure


I still say replace that fuel pump relay.


I've got it. Replace or clean the MAF sensor by the air cleaner. Happened to me once, almost got rear-ended. You can buy spray cleaner and tamper-proff bit set at the auto store, or get an exchange unit for around $100.


Can a maf make the fuel pressure drop to 5psi?


Probably not, it regulates how much fuel is injected. How do you measure pressure while driving? I still say replace that relay and gas cap. Either one could do it, and they are cheap. The only stuff I could find on google is for turbocharged engines.

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 2,589 nationwide Grand Marquis listings starting at $1,300.


Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,820
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,420
View All

Related Models For Sale

Used Ford Crown Victoria"
10 Great Deals out of 1,635 listings starting at $1,950
Used Lincoln Town Car"
48 Great Deals out of 2,404 listings starting at $1,542
Used Chevrolet Impala"
950 Great Deals out of 35,737 listings starting at $700
Used Ford F-150"
3,243 Great Deals out of 216,706 listings starting at $1,000
Used Honda Accord"
1,319 Great Deals out of 78,664 listings starting at $1,395
Used Chevrolet Tahoe"
1,127 Great Deals out of 36,604 listings starting at $1,695
Used Ford Taurus"
345 Great Deals out of 23,134 listings starting at $1,400
Used Cadillac DeVille"
2,387 listings starting at $1,600
Used Ford Mustang"
747 Great Deals out of 41,445 listings starting at $900
Used Buick LeSabre"
20 Great Deals out of 2,604 listings starting at $1,450
Used Toyota Camry"
1,656 Great Deals out of 98,536 listings starting at $895

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
3 Great Deals out of 44 listings starting at $6,999
2010 Mercury Grand Marquis For Sale
9 Great Deals out of 122 listings starting at $3,995
2009 Mercury Grand Marquis For Sale
7 Great Deals out of 132 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
8 Great Deals out of 201 listings starting at $2,500
2007 Mercury Grand Marquis For Sale
13 Great Deals out of 210 listings starting at $1,993