• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Fuel pump not working - Pump, Control Relay or something else?

  • Thread starter Thread starter bhuff30
  • Start date Start date Aug 7, 2011

bhuff30

Founding Member
Dec 11, 2001
6,037
35
129
Olathe KS
Aug 7, 2011
#1
  • Aug 7, 2011
  • #1
I went out to the car this morning and got a no start condition. The starter spins (and quickly), but it doesn't show any fire. If I turn the key, while pushing the fuel rail valve down, there is no fuel pressure at all.

How can I diagnosis if the problem is the pump or the CCRM (is that what it is called?). Also, I would need to know what tools would be required to replace the bad component since I am 200 miles away from my tools.

The car worked flawlessly yesterday, and I even drove it about 200 miles. It had over a quarter tank of gas when parked for the night, but doesn't start today.

Thanks,
Brian
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 7, 2011
#2
  • Aug 7, 2011
  • #2
The gold standard way to begin fuel pump diagnosis is with the IFS switch in the trunk. With the key on, test for +12 volts out of the IFS.

If no voltage, focus on the Fuse, CCRM, or ignition.

If voltage, focus down stream towards the fuel pump itself.

Post the results and go from there.
 

bhuff30

Founding Member
Dec 11, 2001
6,037
35
129
Olathe KS
Aug 7, 2011
#3
  • Aug 7, 2011
  • #3
Thanks Burns.

I checked the fuse and inertia switch, both were in-tact. After some research, I realized that the 97 doesn't have a complicated controller... it is still a simple returnless system. Since I was without all my tools, and I already have 2 voltmeters at home, I decided to take a chance and replace the pump.

The pump is in and all is well now. It was a rather uncomfortable install with only the scissor jack, a flat head screwdriver, a cheap 3/8" socket set and 105F temps... but she is running again. I sure hope I don't have to do that again for another 192k miles....
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 7, 2011
#4
  • Aug 7, 2011
  • #4
Good to hear it's back on the road.

On a return system, I would have gone straight to the fuel pump once voltage to the pump was confirmed. Glad you figgured it out.
 
You must log in or register to reply here.

Similar threads

F
2004 Mustang GT – Fuel Pump Not Priming
  • Fayio
  • Apr 22, 2026
  • SN95 4.6L Mustang Tech
Replies
7
Views
516
SN95 4.6L Mustang Tech Apr 27, 2026
n0v8or
N
S
FUEL PUMP ALWAYS ON
  • Scwhitten
  • Jun 6, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • 2
Replies
34
Views
998
1996 - 2004 SN95 Mustang -General/Talk- Oct 5, 2026
Scwhitten
S
B
'03 GT Fuel Pump/Pressure/Delivery Issue
  • Brodach
  • Oct 21, 2025
  • SN95 4.6L Mustang Tech
Replies
8
Views
1K
SN95 4.6L Mustang Tech Oct 31, 2025
gkomo
D
Fox 88 foxbody no power to red and black wire at fuel pump relay
  • drod88
  • Dec 1, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
7
Views
499
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Dec 2, 2025
Mcmahst
Fox won't crank over and fuel pump won't kick on.
  • djj62478
  • Jun 7, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
16
Views
611
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 11, 2026
General karthief
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?