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Ford Ranger Fuel Pump From Tank Wiring Diagram

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  • #2

Yeah, it should show (+) 12 volts. The computer triggers the relay, which then switches battery power to the fuel pump, via the Pink/Black through the inertia switch. Pretty sure about that, off the top of my head, but I can check the EVTM if needed. Good luck getting it going; sounds like you got a sweet deal. And, welcome to TRS.

  • #4

I think you're right, about your problem being no power into the relay on Black/Yellow (you do find the relay does trip properly).

The reason for the Dk Green/Yellow running from the relay to the computer is it's just a branch-off of the pump power, to tell the computer that the relay did activate when it was commanded to.

The coil of the relay has Red on one side, and Lt Blue/Orange on the other side. When the ignition key is turned on, the same power circuit that turns on the computer also powers one side of the fuel pump relay coil; what makes the relay trigger is that the computer will switch ground onto Lt Blue/Orange, when it wants the pump to run. That branch of the Dk Green/Yellow just confirms back to the computer that the relay did comply.

I hope that description makes some sense, as you look at the diagram again. To check the pump. you can jumper power over into the Dk Green/Yellow to see if the pump runs. Then do the proper repair accordingly, but you sound like you know what you're doing.

Thanks for the comment. I wish that I still had all the ones I traded in over the years. Sounds like you've got a good collection going.

Edit / Add: Keep in mind that the wiring diagram we're looking at is "typical"; I don't think that it matches your year model perfectly. Good luck.

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  • #7

Yes, I believe it's constant power you're looking for going to the relay. I can check the '88 EVTM, but like shadetree pointed out, on an '88 the constant battery power to the fuel pump relay should be protected by a fusible link. The underhood fuse block came along in '89.

  • #11

From the '88 EVTM:

Pump
Power: Black/Pink (after the inertia switch)
Ground: Black
Sending unit
Signal return: Yellow/White
Ground: Black (both Black wires are the same circuit).

You've also got an inline pump on that thing, inside the frame rail under the driver seat; it's powered by the same Black/Pink circuit as the in-tank pump. Both pumps also share the same grounding point, G200, which is below the driver's side dash, to the right of the fusebox.

  • #14

Yeah thats kinda what I was thinking but I still don't have 12v on the pump relay input. Maybe the PO messed around with the other end of the wiring. I still haven't checked the wires past the relay...

EDIT: I may have found another issue. I just went out there looking for the starter relay and found 2 other relay harnesses near what I call the fuel pump relay. There is a Black plug (Thats the one i've been working with), then i just found a green and black plug but both of those harnesses are toast! All bare wire so i have no clue what colors they used to be! this is gunna be fun to fix! Which relay is the fuel pump relay? Black Green or BRown?

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  • #15

Hey Lowrange2, battery power to the fuel pump relay is a Yellow wire, which has a Blue 20ga fuse link at the starter relay.

Source: https://www.therangerstation.com/forums/index.php?threads/fuel-pump.3603/

Posted by: redblues010.blogspot.com