• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Electrical 1991 LX

  • Thread starter Thread starter grizlywinkleman
  • Start date Start date Oct 2, 2018
G

grizlywinkleman

New Member
Jul 13, 2010
1
0
1
Oct 2, 2018
#1
  • Oct 2, 2018
  • #1
Hello everyone,

So I am just about as color blind as they come and am getting frustrated trying to fix an electrical fuel issue. Your help is greatly appreciated!

About a year ago my Fuel pump wouldn't run at all. I have a A1000 that I ran the stock FP power line too and grounded it to the battery - in the trunk. I ran it this way for about 5 years with no issues. I replaced the FP relay and nothing changed. I then checked the voltage in the pigtail for the FP relay and everything seemed to check out but the relay did not switch. I noticed that the EEC relay was clicking but not the FP relay. I was then sent to Iraq for a year and am now trying to get caught back up with the issue.

Now I re-ran a new universal FP relay kit and left the old wiring for now. I tapped into my ignition wire and ran it to a toggle switch (at least for now) and hooked up the rest of the kit according to the instructions. The fuel pump now runs non-stop but the engine will only fire up and feel like it is running until I stop cranking.

Is this a no go or is there a way to independently run my fuel pump? Im suspicious that by bypassing the computer for fuel delivery it is unable to run unless the ignition is engaged.

I did this to make things easier and to clean all the confusing electrical out of the trunk area. I could very easily connect the power wire to the wire feeding from the EEC relay to the FP relay. Not sure that will help.

Again, any help is appreciated!
 
You must log in or register to reply here.

Similar threads

Engine Fuel not pumping
  • Creomod
  • Apr 13, 2026
  • Fox 5.0 Mustang Tech
  • 2 3
Replies
43
Views
705
Fox 5.0 Mustang Tech May 3, 2026
Shakerhood
A
1987 5.0 speed density Foxbody crank no start
  • Alan2204
  • May 23, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
155
Fox 5.0 Mustang Tech May 30, 2026
Mcmahst
S
1990 foxbody 5.0 fuel system.
  • staceyj
  • Nov 28, 2025
  • Fox 5.0 Mustang Tech
Replies
8
Views
354
Fox 5.0 Mustang Tech Nov 28, 2025
Mustang5L5
Resolved Holley terminator integration into CCRM
  • BrandonMP
  • Feb 25, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
213
SN95 4.6L Mustang Tech Feb 27, 2026
BrandonMP
1
Electrical 1985 mustang gt Led conversion trouble
  • 1985fox
  • Jan 5, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
541
Fox 5.0 Mustang Tech Jan 15, 2026
1985fox
1
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 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?