Setting up duel tanks

[Roushstage3]

I am installing duel tanks on my 66 bronco. I am using the electronic tank selector valve from Wild Horses. I followed the instructions and when I switch it to aux tank, which is empty, the gauge goes to empty, but the bronco keeps running. It is obviously not switching to the second tank.

Any ideas on why that would be happening?

 

[AaronWelch]

how long are you letting it idle once switched? It will have fuel in the lines and run for a few minutes.

 

[Roushstage3]

It was over 5 minutes

 

[AaronWelch]

I would double check everything. make sure the new valve is not leaking by. Do you have carb or efi?

 

[Roushstage3]

I will do that. It is carb. Got tired so had to walk away from it. Was very frustrating

 

[DirtDonk]

You should be able to test it without disconnecting any of the fuel lines initially. Turn on the key, flip the dash switch to the position that you have new selector valve hooked to, then slide under the rig (not so easy, or fun, when you're tired of course) and disconnect the wire.
You should hear a distinctive click/clunk each time you touch the wire to the stud.

If not, double check that your valve is grounded to the frame, then double check that you actually have 12v coming to the valve.

See what that gets you. Sorry about the hassle, but at least it's not an ignition or alternator! Should be easier to diagnose a bad connection or bad valve.

Paul

 

[Roushstage3]

dirt thank you. I will do that

 

[blubuckaroo]

The electric valve should only be energized when the aux tank is selected. When the power is off it defaults to the main tank.

 

[Roushstage3]

Need some more advice. I have power going to the switch and I hear it clicking, so it should be opening to the aux tank, but it is still running off the main tank. I am stumped. The fuel lines are hooked up as directed.

 

[blubuckaroo]

Put a meter or test light on the wiring. You should only have voltage when the aux tank is selected. Without voltage, it defaults to the main tank.

 

[DirtDonk]

And it sounds like you're going to have to pull the lines off and blow air through the ports to see that the valve is functioning properly.
Two things that come to mind are: 1. a defective valve, or: 2. insufficient voltage or current to actually move the solenoid.
Yes, you can have enough to hear a click, but not enough to make it actually move all the way. That seems like the less likely scenario, but with these finicky factory fuel gauge switches always acting up, you can't rule it out either.

The only thing for it now though, is to blow air through the "IN" port with the switch off, then on, to make sure it is changing.

Paul

 

[Buldozer]

Some times engines can idle a long time on the fuel in the carb and lines

 

[PaveBronco]

Some times engines can idle a long time on the fuel in the carb and lines

Ditto...diconnect the line to the carb and see if its pumping gas or air...

 

[Roushstage3]

Thanks for the tips. I will give it a shot and let you all know the outcome.

 

[Roushstage3]

Thanks for all of the help. Putting air into the line got the switch to turn. Works great now. Thank you all again.