1990 F-700 help
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Tuned
Joined: Apr 2003
Posts: 282
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From: Va Beach Va
1990 F-700 help
I bought a 1990 F-700 with a 429 in it. It didn't run when I got it so I am trying to get it started.
When I got it it wouldn't do anything. Changed the ignition module and can at least get it to start now using started fluid or gas down the carb so now I am hunting a fuel problem.
The in tank pumps don't come on. If I run a hot wire to the pump it will work so it leads me to believe there is an electical problem somewhere. Is there a relay and if so where is it? Any idea where to start? Also a few times when I ran the hot wire to the pump somehow it rolled the motor over. Is there somewhere where it is all connected?
When I got it it wouldn't do anything. Changed the ignition module and can at least get it to start now using started fluid or gas down the carb so now I am hunting a fuel problem.
The in tank pumps don't come on. If I run a hot wire to the pump it will work so it leads me to believe there is an electical problem somewhere. Is there a relay and if so where is it? Any idea where to start? Also a few times when I ran the hot wire to the pump somehow it rolled the motor over. Is there somewhere where it is all connected?
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Joined: Jan 2001
Posts: 57,025
Likes: 2,758
From: Virginia
That's a big truck and I have no info on it. I can only guess it might be like the f250 and 350's with the 460 and electric fuel pumps. These had a relay over by the brake booster that was activated by a oil pressure switch. The fuel pumps get their power from this relay when the engine was running, but to prime the engine before the oil pressure built up, there was a power feed to the fuel pumps from the starter solenoid wiring.
Here's a diagram for those smaller trucks.
Here's a diagram for those smaller trucks.
Thread Starter
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Tuned
Joined: Apr 2003
Posts: 282
Likes: 0
From: Va Beach Va
Sweet I will take a look. I know I saw a switch on the firewall that has an oil line on it. I figured it was for a low oil pressure cutoff or buzzer or something. Maybe that swich is bad.
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