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

Fuel Fuel pump stays on constantly???

  • Thread starter Thread starter 88-90ConVerts
  • Start date Start date Apr 8, 2019

88-90ConVerts

Member
Oct 1, 2017
50
5
18
Ponte Vedra,Fl
Apr 8, 2019
#1
  • Apr 8, 2019
  • #1
I started running 98 high octane unleaded and noticed one time after I shut the car off I heard the pump still running then it shut off, this only happened one time. Well unfortunately the next day after running my foxbody around town with no issues I got hit in the front passenger side and now the pump is staying on. I have checked the cut off switch in the trunk and its in the down position as it should. I believe that a wire is grounding I'm not sure, any guidance in steering me in the right direction would help thanks. Below I have attached a few pictures, and also th fuel pump is fairly new just an FYI.
 

Attachments

  • image.webp
    76.7 KB · Views: 263
  • image.webp
    97.3 KB · Views: 269
  • image.webp
    147.5 KB · Views: 273

Blown88GT

Founding Member
Nov 13, 1999
2,283
524
164
Palm Beach Gardens, FL
Apr 8, 2019
#2
  • Apr 8, 2019
  • #2
What year? Later years had the fuel pump relay located where you got hit, on the front of the shock tower.
 

88-90ConVerts

Member
Oct 1, 2017
50
5
18
Ponte Vedra,Fl
Apr 8, 2019
#3
  • Apr 8, 2019
  • #3
Blown88GT said:
What year? Later years had the fuel pump relay located where you got hit, on the front of the shock tower.
Click to expand...
Blown88GT said:
What year? Later years had the fuel pump relay located where you got hit, on the front of the shock tower.
Click to expand...


It's a 1990 foxbody and it was hit passenger front fender right where the cold intake is, the passenger apron was pushed in crushing the power pipe.
 

Blown88GT

Founding Member
Nov 13, 1999
2,283
524
164
Palm Beach Gardens, FL
Apr 9, 2019
#4
  • Apr 9, 2019
  • #4
It's one of the 2 relays located on the front of the shock tower. The other is the WOT A/C cutoff relay.
You will have to troubleshoot the relay, connector & connections.
 
Last edited: Apr 11, 2019
Reactions: 88-90ConVerts

88-90ConVerts

Member
Oct 1, 2017
50
5
18
Ponte Vedra,Fl
Apr 9, 2019
#5
  • Apr 9, 2019
  • #5
Blown88GT said:
It's one of the 2 relays loated on the front of the shock tower. The other is the WOT A/C cutoff relay.
You will have to troubleshoot the relay, connector & connections.
Click to expand...


Thanks Blown88GT I'll have to wait until April 22nd the car is going over to the shop to get worked on once they remove the fenders and take everything apart then I can look at the connections and see if anything's been damaged I'm almost 100% sure it's the relay by the shock Tower because that's where it got hit but I'll check the other relay underneath the driver seat just to make sure there's no issues. I did check the cut off switch in the back trunk and it's fine but if I need any assistance after the 22nd I'll post back up to this post.

I have 88 LX convertible mass air California car as well that's the first one I bought and it's almost done.
 

Mstng93SSP

You have a nice rear end there Dave.
15 Year Member
Nov 29, 1999
2,993
3,500
184
Mililani, Hawaii
Apr 10, 2019
#6
  • Apr 10, 2019
  • #6
In 1990 the fuel pump relay should be under the driver's seat.
 
Reactions: 88-90ConVerts
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
241
SN95 4.6L Mustang Tech Apr 27, 2026
n0v8or
N
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
501
1996 - 2004 SN95 Mustang -General/Talk- Nov 7, 2025
04newedge-
0
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
315
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Dec 2, 2025
Mcmahst
Pump stayed running
  • Creomod
  • Feb 6, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
15
Views
437
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Feb 17, 2025
2000xp8
B
'03 GT Fuel Pump/Pressure/Delivery Issue
  • Brodach
  • Oct 21, 2025
  • SN95 4.6L Mustang Tech
Replies
8
Views
873
SN95 4.6L Mustang Tech Oct 31, 2025
gkomo
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?