How can I tell if my fuel pump is going bad?

Asked by Jul 15, 2009 at 03:14 PM about the Mercury Grand Marquis

Question type: Maintenance & Repair

We first noticed a strange sound sort of like someone knocking inside an empty 55 gallon drum.  The sound was spaced out several seconds apart.  It comes from the fuel tank.  In order to hear it better, I removed the gas cap. I could hear suction being released and the strange sound stopped.  I'm tempted to try a new gas cap before tearing into the tank.  Any ideas?

1 Answer

55

sounds more like a plugged vent tube, or something to do with the charcoal can. the fuel tank should not be under vacuum, that would explain the knocking it is your tank being sucked in.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • fuel pump problem 2 answers

    have a 99 grand marquis will crank good but no start if you turn key off and on several times then you will hear fuel pump finally kick on.does that mean fuel pump is going bad and needs replaced

    1999 Mercury Grand Marquis 4 Dr LS Sedan

    -

    Maintenance & Repair

  • where can I locate the pressure sensor for the fuel system and how can I tell if its bad. 2 answers

    2004 Mercury Grand Marquis LS Ultimate

    -

    Maintenance & Repair

  • how can i get the fuel pump to work? 17 answers

    the car stopped, and i Thought it was out off gas, so i Put gas in it and thefuel pump will not work.

    1999 Mercury Grand Marquis 4 Dr GS Sedan

    -

    Maintenance & Repair

  • Fuel 1 answer

    *Help*: my 2001 mgm has a starting issue. It left me stranded... put in a new fuel pump, new fuel filter but wouldn't start. Had it towed to ford dealership where they replaced the computer. They...

    2001 Mercury Grand Marquis GS

    -

    Maintenance & Repair

  • Is the heater core bad, the water pump or head gasket? 2 answers

    I'm losing antifreeze. Traveled 30 miles to work. 25 miles into the ride the thermastat rose nearly to the H. It was about a minute after I turned on the heat and then traffic came to a stop on PA t...

    2003 Mercury Sable GS

    -

    Maintenance & Repair

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,290
#2 kbro
kbro
Reputation 2,050
#3 Js08016
Js08016
Reputation 1,660
View All

Related Models For Sale

Used Ford Crown Victoria
12 Great Deals out of 948 listings starting at $2,990
Used Lincoln Town Car
26 Great Deals out of 1,805 listings starting at $1,695
Used Chevrolet Impala
543 Great Deals out of 28,507 listings starting at $700
Used Chrysler 300
340 Great Deals out of 20,505 listings starting at $1,000
Used Dodge Charger
239 Great Deals out of 27,119 listings starting at $1,997
Used Mercury Marauder
28 listings starting at $9,500
Used Ford Taurus
196 Great Deals out of 19,234 listings starting at $500
Used Ford F-150
2,401 Great Deals out of 210,254 listings starting at $895
Used Ford Mustang
333 Great Deals out of 45,576 listings starting at $2,000
Used Honda Accord
682 Great Deals out of 82,248 listings starting at $500
Used Cadillac DeVille
5 Great Deals out of 1,580 listings starting at $2,900
Used Chevrolet Caprice
143 listings starting at $11,995
Used Chevrolet Tahoe
611 Great Deals out of 27,553 listings starting at $600
Used Buick LaCrosse
196 Great Deals out of 22,821 listings starting at $1,500
Used Chevrolet Silverado 1500
1,981 Great Deals out of 160,213 listings starting at $1,995