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1985 Ford Lindy on a Ford E350 chassis. It has a dual tank setup that's been giving me trouble. I replaced the fuel selector valve, toggle switch, and both fuel pumps and have confirmed all are currently functioning as intended. The issue is that I can't get the front fuel pump to run without feeding 12v directly. The only thing that has not been replaced is a gray relay that is found under the hood on the drivers side, which was discovered to be full of water. The 12v power for each fuel pump is tied to the relay, so it seems this is the culprit, but what is it? None of the wiring diagrams I can find show this relay and there aren't any part numbers listed, so I'm not sure how to identify the correct replacement and I'm hesitant to bypass since I don't know what its purpose is.
The system is configured identically to the attached wiring diagram, except instead of the power conductors from the pumps tapping onto the "D" and "E" terminals, they come from this gray relay. The brown/white and red/brown wires coming off the relay go to each fuel pump and the black conductor is a ground, I'm not sure where the brown and orange cables go.
Does anyone have access to a more complete wiring diagram that might identify what this relay is so I can order the correct replacement?
-With the key in the "aux" position, the rear fuel pump runs continuously (is the pump only supposed to run for a few seconds to prime the carb?)
-The fuel selection toggle switch changes the fuel gauge reading, but does not change which fuel pump is running -there is another relay next to this one under the hood with a green wiring harness, if either relay is removed the pump will not run -15A fuse under dash was blown but is holding now
This diagram is for a truck but it's most likley just like your van. You can see it has two relays. One sends power to the pumps if the engine has oil pressure. The other relay selects which pump runs.
You can see it has the red and brown/white wires feeding the pumps just like yours does.
As far as running all the time, something is wrong there. Your wire may be in the wrong place on the starter solenoid. In the diagram above you can see a "fuse link T". This fusible link and pink/black hash wire power the pumps directly when cranking from the "I" terminal on the starter relay. That is so you get some fuel when cranking the engine from a dry start. Once the engine starts and you let off the starter, this wire goes dead and power for the pumps comes from the other relay when the engine has oil pressure. It's all for safety purposes.
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