Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

fusable links?

Thread Tools
 
Search this Thread
 
Old Dec 10, 2013 | 08:53 PM
  #1  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
fusable links?

I have a long line of fuel pump problems but are one of the fusable links by the starter solenoid for or have anything relation to the fuel pump? Because there are a few fuses missing there
 
Reply
Old Dec 11, 2013 | 07:31 AM
  #2  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
Yes one of the fuse links at the starter solenoid is the power for the fuel pumps.
It should be an 18 GA blue fuse link on your 1987 truck feeding a yellow wire.
I think the fuse link size is an error in the diagram below.



/
 
Reply
Old Dec 15, 2013 | 09:44 PM
  #3  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
I had the EEC tested and it checked out OK. So what's next? I found the fusible link and didn't know how to check the fuse so I just cut it out and soldered it. Just to see if that worked but it didn't do anything.
 
Reply
Old Dec 15, 2013 | 09:54 PM
  #4  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
It ran 6 weeks ago before I rebuilt the engine. I also notice the previous owner cut out the inertia switch. And just made it a straight wire. I cut into it to use a volt meter on it. And it has no power with the key on or off? Should it have power?
 
Reply
Old Dec 16, 2013 | 04:23 AM
  #5  
ArdWrknTrk's Avatar
ArdWrknTrk
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Club FTE Silver Member

Do you have power at pin 6 of the test connector with the key in the run position?

I see fuse link 'N' and fuse link 'Z' in series before that.
The Fuel Pump Relay needs to close in order for there to be voltage present in the Inertia Switch circuit.

If there is voltage at pin 6, try grounding it and see if the pumps turn on.
Or maybe it's just a bad relay?
 
Reply
Old Dec 16, 2013 | 06:35 AM
  #6  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
Grounding that does cause the fuel pump when I turn the key on.
 
Reply
Old Dec 16, 2013 | 06:39 AM
  #7  
ArdWrknTrk's Avatar
ArdWrknTrk
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Club FTE Silver Member

Then everything on that side is working as it should.
It seems the EEC pin 22 is not pulling the relay down.

I'm not sure of the internal workings of the computer.
i.e. what signals it to close that circuit.
 
Reply
Old Dec 16, 2013 | 07:46 AM
  #8  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
Note that when you turn on the key the fuel pumps will run and only have power on to that circuit for one second.

I am thinking you may not have re hooked the small black wire with a green stripe at the NEG (-) post of the battery. That will cause this.
 
Reply
Old Dec 16, 2013 | 07:47 AM
  #9  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
Hmm that so puzzling. Do you know of any other places I can take the EEC to have it tested other than Napa?
 
Reply
Old Dec 16, 2013 | 07:52 AM
  #10  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
How did they or you test it?
You can open it up and check for leaky caps or loose parts.
 
Reply
Old Dec 16, 2013 | 07:53 AM
  #11  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
I took it to Napa and they tested it with their idk what it was but they told me it tested fine.
 
Reply
Old Dec 16, 2013 | 07:55 AM
  #12  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
Also try shorting pin #2 to pin #6 of the of that test plug and see if the pumps run with the key on.
If they do not and the they run when you short pin #6 to ground with the key on then you do not have a ground to the EEC.
 
Reply
Old Dec 16, 2013 | 07:59 AM
  #13  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
Originally Posted by brandonnichols
I took it to Napa and they tested it with their idk what it was but they told me it tested fine.
I did not know they could do that.
It sounds like you may be calling the ICM the EEC and they tested the ICM.
Some call the ICM the TFI module.
 
Reply
Old Dec 16, 2013 | 08:03 AM
  #14  
brandonnichols's Avatar
brandonnichols
Thread Starter
|
Freshman User
Joined: Dec 2013
Posts: 33
Likes: 0
They tested the EEC. Today I will have the ICM tested. Where is it located?
 
Reply
Old Dec 16, 2013 | 08:24 AM
  #15  
subford's Avatar
subford
Fleet Owner
20 Year Member
Photogenic
Photoriffic
Top Answer: 1
Joined: Aug 2005
Posts: 23,666
Likes: 300
From: Easton,Ks
The ICM is located on the side of the distributor.
The ICM has nothing to do with the fuel pumps running when you first turn on the key.
 
Reply



All times are GMT -5. The time now is 03:16 AM.