need help with 87 f150

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Nov 19, 2005 | 04:37 PM

87-f150-302v8

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need help with 87 f150

my 1987 ford f150 has some sort of problem i cannot locate where it might be it has been sitting for about a year and hasent run. it starts will run for about 30 seconds than stall will start up again for maybe 5 seconds than stall and will not run unless i wait about a half an hour to try to restart it i have changed my fuel filter i have a new battery does anyone know whats wrong??

Nov 19, 2005 | 05:00 PM

Beast12

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From: Sarnia, Ontario, CANADA!

Hi and welcome to FTE! Be sure to read this to help you around this site: https://www.ford-trucks.com/forums/s...d.php?t=300691 There are also State, Provincial and International Chapters located near the bottom of the main forum page.

We are glad to have you. Hope you enjoy the site. Check out the various forums. Lots of great info for you.

Thread moved to 87-96 F-Series trucks forum.

See ya on the boards!

-Matt

Nov 19, 2005 | 10:07 PM

rickthefix

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From: Metro Atlanta

this truck should have 2 fuel pumps if a single tank, 3 if a dual tank. One in-tank (1 in each tank) & one external high-pressure pump. Check that they all work after running the engine & it dies. If you have a meter, check the external pump for voltage on the terminals. You could have a faulty inertia switch causing it to loose voltage to the pumps. It is located on the firewall up behind the parking brake. It can be jumped out with a wire to test it.
Mine did the exact same thing couple of years ago & it was the inertia switch. I actually cut it open & fixed it myself. It had burnt/arc'ed internal contacts.
If you don't have a meter to test for voltage, you can either buy a cheap on at RadioShk or even use/buy a test lamp.

Nov 20, 2005 | 07:04 AM

87-f150-302v8

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its dual i tested the voltage going to the external it does run when the truck idles and so do the other to and i checked the inertia switch already and reset it a few times after that it still dosent run could the switch still be faulty and how do i go about in fixing 1 of them?

Nov 20, 2005 | 07:38 AM

rickthefix

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From: Metro Atlanta

Just because the pluger is down does not mean it's working. Remove the connector on the inertia switch & jumper the wires/connectors pins together. This will defeat the switch to see if the truck will run.
I physically cut the assembly apart, cleaned the the contacts, reassembled & fastened using 5 minute epoxy. Careful though, it will fall apart on you & you may have a hard time getting all the pieces back in their proper places. Cut around the seal line.
Good luck!

Nov 20, 2005 | 07:51 AM

cradar69

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Has this taken care of your problem? My 1996 f-150 is having the same issues.

Nov 20, 2005 | 01:22 PM

rickthefix

Mountain Pass

Joined: Oct 2002

Posts: 149

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From: Metro Atlanta

Ford still sells the inertia switch, actually you can get them thru Ford Parts Network on-line usually a lot cheaper than a dealership. I have the Ford part # some where if you need it, or you can look it up youself. But try repairing it youself first, it's about 75 bucks!