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Old 07-02-2015, 02:44 PM   #1
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1987 Ford 7.5L 460" Econoline chassis, Starts but then dies.

I just finished troubleshooting a problem with my 1987 Ford
E350 chassis 7.5L. The engine starts and then dies after 30 seconds. The problem was finding the components to troubleshoot. First, the wires to the fuel pump in the tank showed power during start but none once running. There is a set of safety mechanisms in the fuel pump circuit. If you have a crash, an inertia switch shuts the fuel pump off. If the oil pressure switch doesn't work then the circuit is also shut. During start, a separate independent circuit will power the pump at any rate, letting the engine start up.
I found the oil pressure switch and it checked good. I found the inertia switch on the steering column and it seemed ok, It has a white button sticking out of it to reset it after a crash. I followed the wires to a place under the hood where the fuel relay was located. It was half green and half black. Contacts seemed a little poor on the wire harness. I cleaned them and it worked but failed shortly. i then double checked the power through the inertia switch and needed to re-seat the connector and it then started working. Go to EBAY to see what the inertia switch looks like. There is also a good test point on the fuse box under the dash. The fuse is located on the left side in the second fuse position down, F3 15A. Good luck...
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Old 07-03-2015, 07:31 PM   #2
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You have done good work so far. The pump is kicking on when you turn the ignition to on like it should.
However the EM sends the relay its on signal when it sees rotation of the distributor.
That is what is not happening.
Either the ECM think the oil pressure is LOW or it thinks the Distributor is not turning.

With the it having an inertia switch I don't see why one couldn't go around the ECM
power it with the ignition switch
Do NOT go around the relay OR the inertia switch.

ALSO have you REALLY checked your oil pressure with a mechanical gauge??
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Old 07-04-2015, 05:46 AM   #3
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Note that he does NOT have an ECM.
He needs to jump the oil pressure switch, turn on the key and trace the power with a loading test light.





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Old 07-04-2015, 11:35 AM   #4
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Quote:
Originally Posted by subford View Post
Note that he does NOT have an ECM.
He needs to jump the oil pressure switch, turn on the key and trace the power with a loading test light.

......
a 87 should have a EFI
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Old 07-04-2015, 11:59 AM   #5
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Quote:
Originally Posted by Mekanic View Post
a 87 should have a EFI
The OP said oil pressure switch in the fuel circuit so it is not EFI.
He has a carb.

EFI does not use an oil pressure switch in the fuel circuit, it uses the lack of the PIP train instead.
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