fusable links?
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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
Fleet Owner
Joined: Aug 2005
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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.
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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.
/
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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.
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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?
pedant
Joined: Jan 2008
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From: EXTREME southwest CT
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?
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?
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
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.
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.
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Fleet Owner
Joined: Aug 2005
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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.
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.
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Fleet Owner
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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.
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.
Fleet Owner
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From: Easton,Ks
It sounds like you may be calling the ICM the EEC and they tested the ICM.
Some call the ICM the TFI module.