Fuel tank selector for 78

[RoryH19]

Hello,

Looked through the threads but couldn't find any details.
Need to install the fuel tank selector valve in my 78.
PO removed the unit and connected the left tank directly to the lines on the frame rail.

I found this thread which is probably what it looked like:

Can't find the right fuel selector valve for my 79 Silverado.

I need the valve in the first photo, it's here: https://www.walmart.com/ip/ACDelco-Gold-Professional-Fuel-Tank-Selector-Valve/47613142 but they sent the one in the second photo. My truck does not have a harness with a plug, it has a single wire that connects to a bolt on the metal part of...

www.gmsquarebody.com

My tanks were original and the sending units have 3/8 supply, 1/4 return and the 5/16 is a vent. The vent didn't connect to the valve, had a vent cap similar to a differential.

Also, I'm pretty sure the selector switch is original since it's a 5 wire not 6.

What is everyone using in this situation?

Thanks.

 

[dvdswan]

My 78 only had 3 ports, one from each tank and one to the pump. No returns. Single wire operation. The switch had 5 wires.

You must be registered for see images attach

 

[RoryH19]

My 78 only had 3 ports, one from each tank and one to the pump. No returns. Single wire operation. The switch had 5 wires.

You must be registered for see images attach

Thanks. Not sure why there is a difference on 78s. Why I have a return and you don't. The wiring is probably the same. I'll have to look.

 

[AuroraGirl]

You must be registered for see images attach

Rusted to **** but this was my 1980 GMC k25 with returns

 

[Turbo4whl]

Thanks. Not sure why there is a difference on 78s. Why I have a return and you don't. The wiring is probably the same. I'll have to look.

The reason for the change, is of course, because of the changes in the emission requirements between '78 and '87.

 

[RoryH19]

You must be registered for see images attach

Rusted to **** but this was my 1980 GMC k25 with returns

Yes, that's probably it. Looks like 1 wire to it and maybe 1 to the gauge?

 

[AuroraGirl]

Yes, that's probably it. Looks like 1 wire to it and maybe 1 to the gauge?

your 78 may have had that. is your truck hd chassis, >8600gvw by chance?

You must be registered for see images attach

 

[AuroraGirl]

@78C10BigTen

You must be registered for see images attach

you by chance still looking for this? I stumbled on it accidently Standard Motor Products 11531

 

[78C10BigTen]

@78C10BigTen

You must be registered for see images attach

you by chance still looking for this? I stumbled on it accidently Standard Motor Products 11531

Yes but hate to pay that much tbh

 

[AuroraGirl]

$33.21 is too much for a valve youre passionate to obtain? :O

 

[RoryH19]

your 78 may have had that. is your truck hd chassis, >8600gvw by chance?

You must be registered for see images attach

It's a k10, but that's probably the one.
2 in for each tank and 2 to the fuel pump.

 

[RoryH19]

your 78 may have had that. is your truck hd chassis, >8600gvw by chance?

You must be registered for see images attach

Do you have the part number?

 

[78C10BigTen]

$33.21 is too much for a valve youre passionate to obtain? :O

Last i looked it was above $50

 

[AuroraGirl]

Do you have the part number?

apparently its not sold anymore, I didnt realize the 3 port 1 wire was easier to find than the 6 port.

More Information for STANDARD MOTOR PRODUCTS FV5K

If you want to retrofit, there is a kit I just linked from SMP to use the later motorized valve with 6 ports, mounts in place and pipes the same. will last longer but requires more than swap.

Honestly, Im lazy enough to just use two 3 ports... lol. maybe ensure the power supply is better like relayed wi9th good gauge wire so the solenoid engages positvley every time and also if possible a filter in line before the valve for the send pipes would probably increase their life span.

Just an idea

 

[AuroraGirl]

Last i looked it was above $50

Amazon.com: Standard Motor Products FV1T Fuel Selector Valve : Automotive

Buy Standard Motor Products FV1T Fuel Selector Valve: Selector Valves - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

You must be registered for see images attach