Wiring up new style dual tank valve

[NTDYNA]

I bought a fv5k kit for my C10, I'm going to retain the factory dash switch though. The instructions aren't that clear, Do I need to splice into the sending unit wiring with the valve, then just wire the solenoid, gauge wire directly to the new valve?

[frotosride]

What year is your C10 and what style tank selector do you currently have.
The valve you have looks like a standard pig tail and connector for an '87 TBI dual tank truck. Studying the wiring diagram may help you figure out which wires are which.

[NTDYNA]

What year is your C10 and what style tank selector do you currently have.
The valve you have looks like a standard pig tail and connector for an '87 TBI dual tank truck. Studying the wiring diagram may help you figure out which wires are which.

I have a 76, but the tank selector that came on this truck was wrong. It was a 3 valve for say a non return system.

I think I've figured out where most of the wires go to, but the new pigtail has 5 wires and my set up only has 4 going from the OEM switch to the selection valve itself.

[Mike81K10]

This forum has wiring diagrams and a maintenance manual.

http://forum.73-87chevytrucks.com/smforum/index.php?topic=11766.0

[bd]

http://forum.73-87chevytrucks.com/smforum/index.php?topic=9072.0

[NTDYNA]

Thanks guys, I appreciate it

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[NTDYNA]

OK so, I plumbed it all, the wiring is where I'm having issues really. I have 4 wires (LH sender, RH Sender, gauge and solenoid)

The new valve has 5 wires, I bought the kit version of this tank solenoid but I'm trying to use my OEM button in the dash.

I have not a clue where to put my solenoid wire from my switch!

Any and all help would be great, dump it down because I hate wiring as it is.

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[bd]

Do you have a '76 C10 with factory dual tanks?  How many terminals on the back of the dash switch?

[NTDYNA]

Do you have a '76 C10 with factory dual tanks?  How many terminals on the back of the dash switch?

Yes I do, 5 are on the back of my factory switch

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[bd]

The motorized valve requires a DPDT switch.  The OEM factory switch in the dash is a hybrid DP(S/D)T configuration.  To make the valve work you will need to insert a SPDT ISO relay not shown on the diagram that came with the valve.  The SPDT relay will be controlled by the side of the switch that has only two terminals.

[NTDYNA]

The motorized valve requires a DPDT switch.  The OEM factory switch in the dash is a hybrid DP(S/D)T configuration.  To make the valve work you will need to insert a SPDT ISO relay not shown on the diagram that came with the valve.  The SPDT relay will be controlled by the side of the switch that has only two terminals.

So I need the 81-87 switch and do you by chance have the part number for this relay?

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[bd]

If you are willing to replace the dash switch, use the 1987-up rocker switch for TBI and dispense with a relay.  I suggest the TBI rocker switch because it is not a momentary contact, so you don't need to hold it down if the valve rack is sluggish.  A plus is that the diagram that you received with the new valve applies directly to the later model switch.

You may find it beneficial to peruse the topics, Dual Tanks Theory of operation and Fuel selector switch.

[NTDYNA]

If you are willing to replace the dash switch, use the 1987-up rocker switch for TBI and dispense with a relay.  I suggest the TBI rocker switch because it is not a momentary contact, so you don't need to hold it down if the valve rack is sluggish.  A plus is that the diagram that you received with the new valve applies directly to the later model switch.

You may find it beneficial to peruse the topics, Dual Tanks Theory of operation and Fuel selector switch.

So 87 switch and basically wire is directly like the universal switch that came with the kit?

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[bd]

Yes, with a caveat.  The TBI switch has only 4-terminals because it is internally wired with the cross X.

[NTDYNA]

Yes, with a caveat.  The TBI switch has only 4-terminals because it is internally wired with the cross X.

So how do you wire those 4 then?

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