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

1,130

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.

1,130

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

1,130

I still say replace that fuel pump relay.

1,130

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?

1,130

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 2,249 nationwide Grand Marquis listings starting at $1,500.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,900
#2 kbro
kbro
Reputation 1,970
#3 Js08016
Js08016
Reputation 1,490
View All

Related Models For Sale

Used Ford Crown Victoria
8 Great Deals out of 1,497 listings starting at $2,900
Used Lincoln Town Car
49 Great Deals out of 2,156 listings starting at $1,999
Used Chevrolet Impala
998 Great Deals out of 36,594 listings starting at $1,800
Used Chevrolet Caprice
175 listings starting at $10,900
Used Ford F-150
3,443 Great Deals out of 206,231 listings starting at $1,273
Used Cadillac DeVille
1,957 listings starting at $1,600
Used Ford Mustang
718 Great Deals out of 38,848 listings starting at $1,999
Used Chevrolet Tahoe
1,102 Great Deals out of 31,960 listings starting at $1,495
Used Ford Taurus
358 Great Deals out of 22,551 listings starting at $1,499
Used Buick LeSabre
8 Great Deals out of 2,363 listings starting at $1,768

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
4 Great Deals out of 43 listings starting at $7,617
2010 Mercury Grand Marquis For Sale
98 listings starting at $2,999
2009 Mercury Grand Marquis For Sale
8 Great Deals out of 117 listings starting at $3,495
2008 Mercury Grand Marquis For Sale
7 Great Deals out of 180 listings starting at $2,900
2007 Mercury Grand Marquis For Sale
9 Great Deals out of 168 listings starting at $1,500