• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

crazy electrical problem with fuel pump. PLEASE read and help if you can.

  • Thread starter Thread starter fastf50rd
  • Start date Start date Apr 18, 2005
F

fastf50rd

New Member
Jan 17, 2003
720
1
0
mass.
Apr 18, 2005
#1
  • Apr 18, 2005
  • #1
Alright to start, the car was running absolutely perfect before I parked her in the garage for the night. Next morning went to start it, fuel pump wasn't turning on. Checked all fuses and relays three times with a fine tooth comb, all fuses and relays are good. Next checked to see if there was power to the CCRM from the fuse box under the hood. All three constant hot wires have power. Next I checked the dark green/yellow wire coming from the CCRM to the fuel pump, no power. So, from that I gathered the CCRM was shot. Just for chits and giggles I plugged in a CCRM from an 87' ford taurus. To my disbelief the fuel pump kicked right on and is up to full pressure. Believe it or not the car actually ran somewhat normal with the taurus CCRM. Went to the ford dealership, got raped $150 bucks, plugged the new one in, NOTHING. NO pressure. Took it back, got a new one, still NOTHING. Plugged the taurus one back in, fuel pump turns right on. I've followed as many wires as I can see for chaffs or shorts, and I can't find anything. If any of you have any thoughts on how to find my problem, PLEASE let me know. I really don't wanna pay hundreds of dollars for a ford tech. to find the problem. Thanks for your help.
-Matt
 
M

mustang479

New Member
Apr 6, 2005
22
0
0
Apr 18, 2005
#2
  • Apr 18, 2005
  • #2
fastf50rd said:
Alright to start, the car was running absolutely perfect before I parked her in the garage for the night. Next morning went to start it, fuel pump wasn't turning on. Checked all fuses and relays three times with a fine tooth comb, all fuses and relays are good. Next checked to see if there was power to the CCRM from the fuse box under the hood. All three constant hot wires have power. Next I checked the dark green/yellow wire coming from the CCRM to the fuel pump, no power. So, from that I gathered the CCRM was shot. Just for chits and giggles I plugged in a CCRM from an 87' ford taurus. To my disbelief the fuel pump kicked right on and is up to full pressure. Believe it or not the car actually ran somewhat normal with the taurus CCRM. Went to the ford dealership, got raped $150 bucks, plugged the new one in, NOTHING. NO pressure. Took it back, got a new one, still NOTHING. Plugged the taurus one back in, fuel pump turns right on. I've followed as many wires as I can see for chaffs or shorts, and I can't find anything. If any of you have any thoughts on how to find my problem, PLEASE let me know. I really don't wanna pay hundreds of dollars for a ford tech. to find the problem. Thanks for your help.
-Matt
Click to expand...
Did you check the fuel pump reset in the trunk?
 
F

fastf50rd

New Member
Jan 17, 2003
720
1
0
mass.
Apr 18, 2005
#3
  • Apr 18, 2005
  • #3
oh yeah, one of the first things. The fuel pump works, it just won't work with my ccrm
 

RIO5.0

15 Year Member
Feb 16, 2001
6,892
8
128
N.H.
Apr 18, 2005
#4
  • Apr 18, 2005
  • #4
Sounds like your EEC has a learning disorder.... Check around for grounds and make sure everthing looks ok...happens when you pull the terminal so maybe somethings up with the cables??? weird but its a thought..
She's not learning so well anymore...?
 
F

fastf50rd

New Member
Jan 17, 2003
720
1
0
mass.
Apr 23, 2005
#5
  • Apr 23, 2005
  • #5
Alright, i've been through everything. Grounds, searching for shorted or chaffed wires, fuses again. I don't know what else to check. Anyone else have any thoughts? I really can't afford to get it towed to a Ford dealership and have them rape me.
 
F

fastf50rd

New Member
Jan 17, 2003
720
1
0
mass.
Apr 25, 2005
#6
  • Apr 25, 2005
  • #6
ttt
 

mo_dingo

20+ Year Stangneter
Aug 26, 2003
3,031
2
58
Tucson, AZ
Apr 25, 2005
#7
  • Apr 25, 2005
  • #7
Let me get this straight. By CCRM you mean the main computer, right??? I just wanted to be clear.

Which wire are you testing? Is it the 12V REF voltage? How many wires go to the fuel pump? Is it just a ground and a 12V source?

Simply put, the computer needs to know when to turn the fuel pump on. You need to verify that the computer is getting a 12V signal input on the ignition wire.

Start there. I don't know why a taurus computer works and brand new one won't.

Here is a link to some useful information.

http://forums.stangnet.com/showthread.php?t=533592
Scott
 
You must log in or register to reply here.

Similar threads

I
1994 Cobra - Fuel Pressure Drops Revving at Idle
  • IconicSilverGT500
  • Apr 11, 2026
  • 1994 - 1995 Specific Tech
Replies
16
Views
416
1994 - 1995 Specific Tech Apr 24, 2026
Mcmahst
Resolved Holley terminator integration into CCRM
  • BrandonMP
  • Feb 25, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
238
SN95 4.6L Mustang Tech Feb 27, 2026
BrandonMP
F
2004 Mustang GT – Fuel Pump Not Priming
  • Fayio
  • Apr 22, 2026
  • SN95 4.6L Mustang Tech
Replies
7
Views
255
SN95 4.6L Mustang Tech Apr 27, 2026
n0v8or
N
M
01 mustang 3.8 fuel pressure issue
  • Mhaley2006
  • May 29, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
109
1996 - 2004 SN95 Mustang -General/Talk- May 29, 2026
Mhaley2006
M
1999 Mustang GT - No Start- Need help understanding the fuel pump circuit and how it works
  • 99gtGuy
  • Nov 4, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
507
1996 - 2004 SN95 Mustang -General/Talk- Nov 7, 2025
04newedge-
0
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific 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?