Greg 85 Posted March 31, 2020 Share Posted March 31, 2020 Hello, my name is Greg and I am in Virginia, I have a 1985 Ford F150 Explorer with a 5.0L EFI/AOD 2WD longbed. All original except for paint color and stereo. This is my first of two Ford trucks. I bought this truck as a non running project because the body and interior were immaculate for its age. They previous owner had done a lot of work on the body and interior but the engine and drivetrain left a lot to be desired. I towed the truck home and started work on the engine, turned over and had spark but no fuel. Traced it back to the relay. Replaced relay and connector, started, ran like crap but ran. Ended up changing the idle air solenoid and fuel pressure regulator. Ran good but wouldn't shift correctly, adjusted the TV cable and tore down the tailshaft and cleaned reassembled the governor and still wouldn't shift right. Changed the air filter and now shifts fine (go figure). Drove the truck around for two months and then started acting like it was starving for fuel. Ended up acting like HP fuel pump wasn't putting out, Replaced along with new fuel filter. No change, so I dropped both tanks and replaced with new including senders and pumps/strainers. Startes and runs but dies after about 20 mins of running. Still have spark, no fuel. Come to find out it had a intermmitten short, when I would check for power it was there but would cut out while running. Bought a Chiltons magazine, no diagram for 85 fuel injected, traced wires best I could, replaced inertia switch just in case, no change. Replaced every ground wire, strap and cable, no change. Pulled every connector and cleaned corrosion off, no change. I bypassed the factory harness with a makeshift power source and switch to the HP fuel pump(Temporary for testing), runs like a champ, drives like it should. Any advice would be helpful! Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 31, 2020 Share Posted March 31, 2020 Greg - Good job on the signature. On the high pressure pump problem, the system isn't too complicated, as shown below from the '85 EVTM. (I've assumed that yours is a single tank system.) Where did you jump from and to with your makeshift power? Link to comment Share on other sites More sharing options...
Greg 85 Posted March 31, 2020 Author Share Posted March 31, 2020 Greg - Good job on the signature. On the high pressure pump problem, the system isn't too complicated, as shown below from the '85 EVTM. (I've assumed that yours is a single tank system.) Where did you jump from and to with your makeshift power? It is actually a dual tank set up and I had completely bypassed the factory wiring and hooked up directly to the battery with a toggle switch for testing purposes. Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 31, 2020 Share Posted March 31, 2020 It is actually a dual tank set up and I had completely bypassed the factory wiring and hooked up directly to the battery with a toggle switch for testing purposes. That's a bit more complex, but not too bad. I'd start through the system inch by inch, starting at the tank selector valve/switch. If that doesn't work you won't get voltage to the pump. And they are a known problem. Link to comment Share on other sites More sharing options...
Greg 85 Posted March 31, 2020 Author Share Posted March 31, 2020 That's a bit more complex, but not too bad. I'd start through the system inch by inch, starting at the tank selector valve/switch. If that doesn't work you won't get voltage to the pump. And they are a known problem. http://forum.garysgaragemahal.com/file/n55172/1985-etm-page104_1.jpg Thank you! It is raining now but when it dries up, I will take a gander at it and see if I can locate the issue. I will let you know what I find. And again Thank You! Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 31, 2020 Share Posted March 31, 2020 That's a bit more complex, but not too bad. I'd start through the system inch by inch, starting at the tank selector valve/switch. If that doesn't work you won't get voltage to the pump. And they are a known problem. http://forum.garysgaragemahal.com/file/n55172/1985-etm-page104_1.jpg Thank you! It is raining now but when it dries up, I will take a gander at it and see if I can locate the issue. I will let you know what I find. And again Thank You! Welcome. That switch/valve is on the frame roughly below the driver, IIRC. As said, it is a known problem and is sometimes hard to find and expensive if you do. Link to comment Share on other sites More sharing options...
1986F150Six Posted March 31, 2020 Share Posted March 31, 2020 That switch/valve is on the frame roughly below the driver, IIRC. As said, it is a known problem and is sometimes hard to find and expensive if you do. E3TZ-9189-A? Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 31, 2020 Share Posted March 31, 2020 That switch/valve is on the frame roughly below the driver, IIRC. As said, it is a known problem and is sometimes hard to find and expensive if you do. E3TZ-9189-A? No. That's the valve by itself from what I remember. He needs the switch/valve combo. I think this is it, from our page on Documentation/Fuel Systems/Fuel Systems Part #'s/Fuel Tank Selector Valve: Link to comment Share on other sites More sharing options...
85lebaront2 Posted March 31, 2020 Share Posted March 31, 2020 No. That's the valve by itself from what I remember. He needs the switch/valve combo. I think this is it, from our page on Documentation/Fuel Systems/Fuel Systems Part #'s/Fuel Tank Selector Valve: Two items, (a) I would use the 1986 diagram. I have never seen a 1985 wired like the EVTM shows. (b) in the reservoir/tank selector valve on 1985/86 only is a filter element that looks like one in some of the old mechanical pumps. If it is clogged you will have fuel starvation problems. Link to comment Share on other sites More sharing options...
Gary Lewis Posted March 31, 2020 Share Posted March 31, 2020 Two items, (a) I would use the 1986 diagram. I have never seen a 1985 wired like the EVTM shows. (b) in the reservoir/tank selector valve on 1985/86 only is a filter element that looks like one in some of the old mechanical pumps. If it is clogged you will have fuel starvation problems. Good point, Bill. I've included the '86 schematic below. It'll be interesting to see how his is wired. As for the filter, I'm not sure that is it as he ran a jumper to the pump and that solved the problem. But, do you think that by bypassing the resistor in the wiring that could do it with a dirty filter? Link to comment Share on other sites More sharing options...
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