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I've replaced fuel tank, pump, sending unit, tcm.

Tiny
ANONYMOUS
  • MEMBER
  • 1989 FORD MUSTANG
  • 89,000 MILES
I've replaced fuel tank, pump, sending unit, tcm mod on distrub. I've tested relays, replace ignition sw, and ket switch. And still can't keep my Stang running. It will run if you turn the key and spray down the trottle body, or if you turn the ket and remove the starter wire from the relay ( you must hold the ket forward ).
these are the only 2 ways to keep it running, why?
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Tuesday, April 9th, 2013 AT 5:22 PM

9 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Do you have a multi meter to check powers and grounds?Have you checked the actual fuel pressure?Also checked for injector pulse?
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Tuesday, April 9th, 2013 AT 6:55 PM
Tiny
MILKMAN375
  • MEMBER
  • 4 POSTS
Yes I checked fuel pressure, no I did not check injector pulse. I just borrowed the injector pulse kit and will try that. Also I do have a multi meter. What did you have in mind?
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Tuesday, April 9th, 2013 AT 7:11 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
One other thing to add, check to see if your inertia switch for fuel is engaged it in the trunk on the wheel well
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Tuesday, April 9th, 2013 AT 8:00 PM
Tiny
MILKMAN375
  • MEMBER
  • 4 POSTS
Inertia switch is working fine
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Tuesday, April 9th, 2013 AT 8:02 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
So what was your fuel pressure reading?
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Wednesday, April 10th, 2013 AT 4:03 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Does this have an anti theftdevice installed on it?Is it a diode key? If that is engaged you wont' start or run what you weem to be doing is jumping it.
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Wednesday, April 10th, 2013 AT 1:54 PM
Tiny
MILKMAN375
  • MEMBER
  • 4 POSTS
If I remember correctly fuel pressure was 38lbs.

I also replaced the fuel relay and eec power relay, now it doesn't want to start at all. And I lost pressure on my fuel rail.

Can you provide me with a scamadic of the grounds for the fuel and ignition systems?
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Wednesday, April 10th, 2013 AT 4:09 PM
Tiny
MILKMAN375
  • MEMBER
  • 4 POSTS
I don't see any aftmkt anti-theft devices. And I have already replaced key and keyclyn.& Ignition switch.
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Wednesday, April 10th, 2013 AT 4:15 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You have a pressure /pump problem if you dont' have any pressure at the rail. The relay grounds through the pump so follow the black lead form pump it will probably be on frame someplace there, the ignition grounds through pcm and it doesn't show an exact place. So check by pcm. Check the fusible links in pic that i'm sending youmay have one or several that re burnt up that will effect your starting running if they are as you can see in pic there are couple that go to fuel. They are available at auto parts.
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Wednesday, April 10th, 2013 AT 4:32 PM

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