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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?
-With the key in the "aux" position, the rear fuel pump runs continuously (isn't the pump only supposed to run for a few seconds to prime the carb?)
-there is another relay next to this one under the hood, if either relay is removed the pump will not run
-15A fuse under dash was blown but is holding now
which engine is in your E350? I thought that in 1985 that only van with electric fuel pumps were ones with the 7.5 engine? My 85 with a 5.0 engine uses a mechanical pump mounted on the engine block.
which engine do you have?
There are several diagrams in 3 different sections I have to go through. You have duel tanks with a low pressure pump in each tank?
Is the 6 port valve two separate units put together or one whole unit? I ask because the manual; states 6 port but only shows a 3 port valve. Does one valve control the supply from each tank to the engine and the other valve control the return flow from the carb to the tank?
The info I have is from a Ford service manual for the 1985 vans and trucks. In this page it references Fig 16 and Fig 19. Fig 16 is for a F series and i have already posted fig 19 above. Here again tough as I mentioned, they only show 1, 3 port valve
The 1985 EVTM would probably give you a much better diagram but I never bought one for my 85.
let me know if this helps or if you think you need more info. There is some in the electric fuel pump section. That is where this diagram came from. It shows duel tanks and an "oil pressure switch" in the circuit. As far as I know, the 7.5 engine is the only engine that uses the OP switch in the fuel circuit. Unless perhaps a diesel does and I am in the gasoline engine section.
let me know if this helps or if you think you need more info. There is some in the electric fuel pump section. That is where this diagram came from. It shows duel tanks and an "oil pressure switch" in the circuit. As far as I know, the 7.5 engine is the only engine that uses the OP switch in the fuel circuit. Unless perhaps a diesel does and I am in the gasoline engine section.
Thank you so much for your help. It is a 7.5L 460 motor, dual tank set-up, so there are 6 ports on the selector valve (supply/return to each tank, supply/return to carb).
The diagrams you shared are close, particularly figure 19, although I haven't put my eyes on the inertia switch or oil pressure switch yet. I believe the fuel tank selector relay "13A025" and fuel pump cutoff relay"9345" are the ones I am after, can you point to me a source to buy them? I'm looking up those part numbers and nothing online seems to match the part number exactly. I'm also having a hard time finding a replacement fuel pump for the front auxiliary tank, it's shorter in height than the standard in-tank fuel pump. I'd prefer the whole hanger assembly, but I could also make do with a strainer that fits the original fuel pump.
The attached wiring diagrams are the closest representation I can find of the wire coloring scheme, but they don't provide any clarity on the relays themselves.
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