Fuel Selector switch

[85blueox]

Anyone know where I can get a fuel selector switch?  The ones I see on eBay, Amazon are more of a triangular shape plug, mine is rectangular.

85 diesel F350.

[ArdWrknTrk]

You want E3TZ9A050-AA (marked E3TB 9A050-AA)
It's the same as an '83-'86 460 gas engine

Here's the EVTM pages:



And here are the part numbers:

[85blueox]

is that a Ford #? Or where do I search for that?

[viven44]

That particular switch for the dual tank w/return line for 460/diesel is pretty much unobtainable. You can google that part number and see what you find.

Its a 4 pin switch which is different from the F150 selector switch which has 5 pins. You can find the 5 pin switch all day from many sources.

Best bet is to find one off a parts truck somewhere.

Good news is even if they are not working (Test with multimeter) --- they are fully serviceable. Can open them up, clean them, regrease them and install.

[ArdWrknTrk]

Those are factory manuals, so yes that is a factory p/n and the ID# you would find ON the part.

Like Viven said, you can likely rebuild your existing one.
Or you can find any mid '80's 460 or IDI to scavenge one from.

Worst case, you have the wiring diagram and can hack a DPST rocker switch from just about anywhere (it doesn't pass much current) as long as it will fit in the space.

[Ifitaintbroke]

This thread just reminded me that I never got those pics of my setup. I think it would help people out a lot to be able to simplify the factory wiring. Give me a few minutes and I'll put it up on my thread...

[85blueox]

Thanks!
Ill pull it and rebuild it.

[ArdWrknTrk]

I hope that works out for you!

Otherwise, you're not limited to only 83-86 IDI, you can use a 460 switch (they are identical). 😉

[85blueox]

I pulled it, pulled it apart.  It was dirty but otherwise seemed ok.  I cleaned the terminals and put it back to gather.  So now I move on to the next possible problem which is either the gage or the selector valve.

[ArdWrknTrk]

What is the problem that made you want a switch?

The gauge is switched by the valve (diagram above)
If you can't switch tanks, it's the valve.

If the gauge doesn't read on one side it's the wiring after the valve

[85blueox]

The problem is that the gauge shows empty and does not move.  Switch has power and seems to work fine, have power at the valve.  It has fuel by shows empty and does not move when the switch is selected from front to back.

[85blueox]

I can check the grounds, where are the selector tank/sending units ground at on the truck?

[ArdWrknTrk]

Look at the diagram
G105 & G701.

There's TWO paths to ground!

So while I doubt ground is a problem, you need to look in the front of the appropriate EVTM here on the site.
Maybe someone else has the time to show you.....

[mat in tn]

remove the radio and there is aground just inside the opening towards the glove box on the steel dash skeleton. but are the oil and temp gauges working? they share the same voltage supply. although they each ground at the engine block.

[ArdWrknTrk]

701 handles a LOT of "stuff"

You'd notice if it was gone.  

[mat in tn]

have you proven the gauge independently?

[85blueox]

My other gages work fine.  

[85blueox]

I did see on the diagram where G701 is grounded, but it shows for the diesel that I have it has a ground on G105 and it does not show where it is grounded.  I would think back on the frame somewhere.

[ArdWrknTrk]

Go look at the EVTM, in the front, all the grounds are shown....

But I don't think it's a ground.
I think you have a crudded up connector under the truck.

[viven44]

Process of elimination

Unplug the harness at the selector valve on the frame. Jump pins 3 and 4 or 5 and 4. It will bypass anything and everything and should connect front or rear sender respectively to fuel gauge depending on which pins you Jump.

If that doesn't work either, definitely something with grounds, gauge itself, etc