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Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 12366
Experience:  30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Ranger 2.9: I have an 86 Ford Ranger/2.9 Dual tanks. The other

Customer Question

I have an 86 Ford Ranger/2.9 Dual tanks. The other day with full tanks both gauges went to E and the truck stopped. I have spark but no feul.
Submitted: 7 months ago.
Category: Ford
Expert:  Tim Mohr replied 7 months ago.
Hi, my name is XXXXX XXXXX the gauge move at all when you switch tanks?
Customer: replied 7 months ago.

No and when jumping power ( fused jumper ) gauges don't move

Expert:  Tim Mohr replied 7 months ago.
ok, this is usually caused by a bad switch over valve, this valve controls the fuel pumps and the gauge for each tank, do you have a volt meter or test light, we need to check for power on the red wire at the switchover valve, with the key on, can you do this?
Customer: replied 7 months ago.

Yes . No power into switching valve

Expert:  Tim Mohr replied 7 months ago.
ok, then we need to check the inertia switch, have you checked for power into the inertia switch, and out?
Customer: replied 7 months ago.

no power into inerta switch

Expert:  Tim Mohr replied 7 months ago.
did you check this while cranking the engine, or with the key just in the on position?
Customer: replied 7 months ago.

on , but will check while cranking now

Expert:  Tim Mohr replied 7 months ago.
let me know,Tim
Customer: replied 7 months ago.

no power to switch crranking also

Customer: replied 7 months ago.

No power while cranking either

Customer: replied 7 months ago.

No power while cranking either

Expert:  Tim Mohr replied 7 months ago.
ok, this gets its power from the fuel pump relay, can you pull the relay and see if 2 terminals on the relay have power when cranking?
Customer: replied 7 months ago.

This will take a minute or 2 Be right back. The feul pump relay is the brown one , right?


 

Expert:  Tim Mohr replied 7 months ago.

it is on the right hand fender, i will post a picture showing it below,Tim

graphic

Customer: replied 7 months ago.

Both red (16 gauge wires) have power cranking and ign. on

Expert:  Tim Mohr replied 7 months ago.
you need to check the actual terminals in the socket that the relay plugs into, it should have 2 that are hot while cranking, one has a red wire and one has a yellow wire,Tim
Customer: replied 7 months ago.

I have two that are hot while key on and cranking, one yellow,one red, another red is not hot without relay in place

Expert:  Tim Mohr replied 7 months ago.
ok, when the relay is in place, do you feel it clicking when the key is turned to on? it should click once?
Customer: replied 7 months ago.

finally got someone to help. yes the relay clicks

Expert:  Tim Mohr replied 7 months ago.
ok, with the relay in, do you get power on the orange/light blue wire at the relay, while cranking?
Customer: replied 7 months ago.

Yes

Expert:  Tim Mohr replied 7 months ago.
but you dont have power on the orange/light blue wire at the inertia switch?
Customer: replied 7 months ago.

No

Expert:  Tim Mohr replied 7 months ago.
then you have a break in that wire, it goes from the relay directly to the inertia switch, now you were checking the power at the inertia switch when cranking, correct?
Customer: replied 7 months ago.

Yes While cranking

Expert:  Tim Mohr replied 7 months ago.
then there is a break in the orange/light blue wire, you will have to either trace it out, or run a new wire from the relay to the inertia switch,Tim
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 12366
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
Tim Mohr and 13 other Ford Specialists are ready to help you
Customer: replied 7 months ago.



Hi Tim: John with the 86 ranger again. Because of the past butchery on this truck I had the wrong relay. It's the green one! Repeating the tests I have no power to either the red or the yellow wire on cranking. Any Ideas?


 


Model: Ranger
Year: 1986
What have you tired so far?: Tests with Tim's help led me to the relay wiring. Past mec.'s have changed harnesses on the relays.




Expert:  Tim Mohr replied 7 months ago.
ok, the fuel pump relay gets its power from the ecc relay on one wire and from the battery on the other, the eec relay gets its power from the battery, I suspect the wire from the battery to the rlays is bad them, since the ecc relay is not sending power on one of the fuel pump relay legs, do you know where the ecc relay is? It is in the kick panel uner the passenger side dash, on the right side, if you can access this relay, we can check power to this?
Customer: replied 7 months ago.

  1. yes I have gotten this info from another source. the people who understand that if I ask about the color of a relay on a 26 year old truck the relays have been removed or moved over time. Please tell customer service to just process the refund I hàve asked for.

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