Fuel pump replacement

Tiny
LEFTRIGHTORRIGHTLEFT
  • MEMBER
  • 2000 MERCURY MYSTIQUE
  • 200,000 MILES
Is there an easier way to replace my intank fuel pump? Is there a porthole under the back seat or something to get to the gas tank without having to disassemble the underneath of my car? Also I was told that I could buy an "external" type electric fuel pump I can just hook up to the fuel line, is this true? Thanks
Thursday, September 19th, 2013 AT 1:18 AM

19 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's under the seat here are directions and this guide can help as well

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE. Disconnect negative battery cable. Remove rear seat cushion. Remove rubber grommet from floor pan. Clean area to prevent contamination in fuel tank. For vehicles without returnless fuel systems, go to next step. For vehicles with returnless fuel systems, go to step 3.
NOTE:Fuel feed line connectors are White or are identified by a White band. Fuel return line connectors are Red or are identified by a Red band.

Returnable Fuel System
Disconnect fuel pump module connector. Disconnect fuel feed and return lines from fuel pump module by squeezing tabs on fuel lines together and carefully pulling fuel lines from fuel pump module. Using Fuel Tank Sender Wrench (D84P-9275-A), turn retainer ring counterclockwise and remove retainer ring. Remove fuel pump module. Cover fuel tank opening. Remove and discard "O" ring.
Returnless Fuel System

Disconnect fuel feed line from fuel pump module by squeezing tabs on fuel line together and carefully pulling fuel line from fuel pump module. Using Fuel Tank Sender Wrench (310-065A), turn retainer ring counterclockwise and remove retainer ring. Remove fuel pump module. Cover fuel tank opening. Remove and discard "O" ring.
Installation
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Thursday, September 19th, 2013 AT 5:46 AM
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
  • 1998 MERCURY MYSTIQUE
Electrical problem
1998 Mercury Mystique 6 cyl Front Wheel Drive Automatic

i put my car on ramps to change my speedometer wire before I did that the car was running fine after I changed that speedometer wire the car wont start it just turns over
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Did you disconnect battery before making the repair? Check fuses, can you hear fuel pump buzz for few seconds when you first turn key without cranking?
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
No I didnt disconnect the battery before I changed the wire. The fuses are all good. When I turn the key it doesnt buzz or nothing
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Test out the fuel pump relay, it is in left front corner of engine compartment, in battery junction box.
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
  • 1998 MERCURY MYSTIQUE
  • 6 CYL
  • FWD
  • AUTOMATIC
I changed my speedometer wire on my car and I went to go start my and the fuel pump wouldn't come on
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
I bought a new relay it still doesnt turn on when I turn on the key
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the fuel pump fuse, inertia switch and the fuel pump relay
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
May want to double check wiring to pump then to ensure you didnt' damage or knock loose when was making repair to speedo. If its good then could be coincedence that fuel pump went out. Can remove and test pump before replacing to make sure it is bad.
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
I checked the fuse it isnt blown I replaced the relay and when I check to see if there is power to the inertia switch, there is no power to it so what do I do
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
Where could I bring it to get it tested autozone or something
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If both fuse 9 and 14 are okay-its either the computer controlled of the relay is defective or open and also the violet and orange wire is open to the inertia switch
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Not sure if auto part store tests fuel pumps, any local shop could do it though.
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
Wat do u mean computer controlled of the relay
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
By open u mean that the wire is bad or damaged and wat is the computer controlled of the relay
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The computer control of the relay energizes the coil side of the relay this don't happen-no power to the fuel pump
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
Is the computer control of the relay something u can buy or how can u fix this
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
By replacing the computer if the wire to it is good
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)
Tiny
KENNEY142
  • MEMBER
  • 19 POSTS
I just want to say thank you so much as I looked at fuse 9 it was blown I went and bought one and my car is working fine now I just wanted to say thanks so much
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Thursday, October 15th, 2020 AT 11:00 AM (Merged)

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