Hi all,

I remember reading a thread with a post that states what the below electrical item is, CRS sucks, I've searched and cannot find the answer ...

So what is it, Water in fuel ??? One of the wires goes to the filter area, never plugged in since before I owned the truck!


Thanks!

-Enjoy
fh : )_~

 

the black block is a relay, the 2 wire plug goes to the block between the fuel filter and the ip, and the blown is of course for the #1 glow plug

 

Dang, I forgot to point the black box out, my mistake ... Ok it's a relay, for what???

-Enjoy
fh : )_~

 

not sure lol. if nobody else can pin point that for you, i'll cut my old loom apart and trace it for ya. ive been wondering myself.

 

My loom is apart, the PO had all the wires off the filter stuffed down by the thermostat housing doing nothing ... It doesn't have the standard Ford 7.3 Filter on it.

To the relay, there are 4 wires, 3 of them go to the engine bay harness, 1 goes to the fuel filter, it looks like it would only reach to the bottom of the filter, it has a 90 degree female stud connector just like the oil sending unit.

Wire colors ...
<table><tr><td>1</td><td></td><td align="right">16Ga. Red/Yellow</td><td></td><td>-</td><td></td><td align="left">Water in Fuel ???? (little black cube) pin1 - From Relay to Engine Bay</td></tr><tr><td>2</td><td></td><td align="right">16Ga. Red</td><td></td><td>-</td><td></td><td align="left">Water in Fuel ???? (little black cube) pin2 - From Relay to Engine Bay</td></tr><tr><td>3</td><td></td><td align="right">16Ga. Black/LtBlue</td><td></td><td>-</td><td></td><td align="left">Water in Fuel ???? (little black cube) pin3 - From Relay to Engine Bay</td></tr><tr><td>4</td><td></td><td align="right">16Ga. Black</td><td></td><td>-</td><td></td><td align="left">Water in Fuel ???? (little black cube) pin4 - From Relay to Fuel Filter???</td></tr></table>
The Water in fuel sensor is in the bottom of the 7.3 filter correct, so that's what it has to be for, though I'm only assuming!

-Enjoy
fh : )_~

 

This is the relay for the fast idle and cold advance IIRC. Dunno why you have a wire from it to the fuel filter, that wire should go from the filter to the WTS module in the dash... I'll see if I can sort mine out tomorrow in the daylight.

 

I think I figured it out ...
<table><tr><td>1</td><td></td><td align="right">16Ga. Red/Yellow</td><td></td><td>-</td><td></td><td align="left">Water in Fuel Relay - Switched 12v+ keyon/keystart</td></tr><tr><td>2</td><td></td><td align="right">16Ga. Red</td><td></td><td>-</td><td></td><td align="left">Water in Fuel Relay - Relay switched 12v+ to power Water In Fuel indicator</td></tr><tr><td>3</td><td></td><td align="right">16Ga. Black/LtBlue</td><td></td><td>-</td><td></td><td align="left">Water in Fuel Relay - Grounded with keystart for Bulb test</td></tr><tr><td>4</td><td></td><td align="right">16Ga. Black</td><td></td><td>-</td><td></td><td align="left">Water in Fuel Relay - Trigger, WIF sensor grounds this energizing the relay</td></tr></table>
At least thats what I've come up with without a schematic ...

Thanks

-Enjoy
fh : )_~

 

I think you've got it... the relay isn't part of fast idle/cold timing advance, I just took apart that whole circuit to wire a manual override switch for that system.

Unfortunately my Ford super-electrical manual is at home out of my reach. I can post the schematic for the WIF system this afternoon if it'll help you out.

_____________________________________________
1994 F250 XLT HD 7.3L IDI E4OD w/ Banks Sidewinder
1994 F350 XL 5.8L E4OD
1996 F150 XL 5.0L E4OD
1990 F150 Custom 5.0L 5-Speed
1976 Bronco 5.0L 5-Speed (x2)

 

the water in fuel plug is black with a black 90 degree elbow on it that slips over a threaded stud.

 

Ok the EVTM manual says the following: (colors are for 1994)
The relay is part of the "Warning Indicators" circuit and for the WIF indicator

Red/Yellow - From Fuse 17 to the Relay - 12V in Start or Run
Red/Black - From Fuel/Water Sediment Bowl to the Relay - Grounded when water present
Black/Light Blue - From Ignition Switch to Relay - Grounded in "Start" and open otherwise
Red - From Relay to Water-In Fuel Indicator

If either the key is in start or theres water in the filter bowl, one side of the relay circuit is grounded, connecting 12V to the WIF light on the other side of the relay.

Festus you got it right on.

 

Thank you all ...

-Enjoy
fh : )_~