Tank selector valve area pics ?

[Pyrotechnic]

Does anyone have pics of the selector valve area on a unmolested truck ?

Reason is, I suspect some rigging on my truck. The outlet fitting looks like 5/16's instead of 3/8, and the way it's mounted does not look stock. I've seen other selector valves on other trucks in the past, and this one just doesn't match up.

EDIT: Also, the valve currently on the truck is a 2 in, 1 out valve. The vents that are on the fuel tanks consist of a short length of hose, then a plastic breather exactly like the kind for a rear axle vent. This truck is a Heavy Half and had little to no emissions equipment from the factory. I've search through posts and many specify a 6 port valve, which makes sense for a TBI setup, but not for a carb ? I don't see any reason to switch the vent lines ?

[UNDERDOG1]

I have a 6 port on my 79' that has been bypassed to work just one tank,I would be interested in this as well.My sending unitseach have 3 portsand my selector valve has 6 ports.

[moneyeater]

Mine was a 350 diesel originally!
The valve has 6 connections.the second pic shows the passengerside rear cabmount to give you an idea where it sits!

[Pyrotechnic]

Thank you ! Looks like mine is definitely not factory. It looks like the inlets and outlets are all 5/16 on it too. Kinda scary with the power I'm making.

OK, so 3 of the lines on the valve are for fuel, what are the other two for ?

I'm just trying to figure out what valve to buy. I have found both, 3 port and 6 port. I figure if anything I can just buy the 6 port and cap off whats not used. I have no idea what was done under there, but all I have at this point is two supply lines to the valve, and one line going to the engine. Nothing else.

[Prong]

3 ports are for manual trannies and the 6 ports are for auto trannies. On the 6 ports, two are for the tank vents.

[Pyrotechnic]

Thats strange, why would the transmission play a part in the fuel selector valve ? How would the tanks vent on a manual transmission truck with a 3 port valve ? And on a automatic truck, where would the vent line go to ?

My truck is an automatic and has been since day one.

Sorry for the flood of questions, I just want to re do the fuel system in a way that somewhat resembles how it would have come from the factory.

[firedrag79]

I've got a 6 port switch and it has a return line from the motor. So that is why it needs the extra 3 ports. To get the return fuel back to the correct tank.

[moneyeater]

I found this one! It´s not original but it´s used in our trucks!

http://www.jcwhitney.com/POLLAK-ELEC...2070_10101.jcw

[Pyrotechnic]

Originally Posted by moneyeater

I found this one! It´s not original but it´s used in our trucks!

http://www.jcwhitney.com/POLLAK-ELEC...2070_10101.jcw

It looks like the one you have mounted to your frame. Did you have to modify your wiring or did your truck already have that 6 pin plug ?

[moneyeater]

Originally Posted by Pyrotechnic

It looks like the one you have mounted to your frame. Did you have to modify your wiring or did your truck already have that 6 pin plug ?

I removed the driverside tank and the valve long ago and i completely rewired the truck so i really don´t remember if the wiring was all original but i think so!
Jcw offers one with 6 and one with 3 connections and you´re right the one in the link looks like the one i had!

[78 Chevyrado]

I bought the service replacement from the chevy dealer on my no emmisions 78 c20. I have the exact setup you have, short piece of hose with a vent on the end (single fuel line) and the one wire hook up. The part number is 15580925 and is still available. You can get it at gmpartsdirect.com for $12-$13 plus shipping. At the dealer, mine was 18.53 with tax.

It's not exactly like the original but works perfectly. Instead of remounting it to the original hole, I found one nearby and rebent the bracket a bit and it was good to go with no other modifications.

If I can remember, I'll try to get a pic of it monday when I go up to the body shop.

[Pyrotechnic]

Originally Posted by 78 Chevyrado

I bought the service replacement from the chevy dealer on my no emmisions 78 c20. I have the exact setup you have, short piece of hose with a vent on the end (single fuel line) and the one wire hook up. The part number is 15580925 and is still available. You can get it at gmpartsdirect.com for $12-$13 plus shipping. At the dealer, mine was 18.53 with tax.

It's not exactly like the original but works perfectly. Instead of remounting it to the original hole, I found one nearby and rebent the bracket a bit and it was good to go with no other modifications.

If I can remember, I'll try to get a pic of it monday when I go up to the body shop.

Good to know ! I thought I was the victim of some rigging.

The only thing that's bothering me is that the valve I have now has 5/16 fittings. Looks like one of the parts store universal valves. I'm making quite a bit of power and it bothers me to know I have this kind of restriction in the line. Also, the only reason the hoses seal on the fittings is because of the hose clamps.

Did this particular replacement have 3/8 fittings ?

[78 Chevyrado]

Originally Posted by Pyrotechnic

Did this particular replacement have 3/8 fittings ?

Mine has 3/8 fittings on all 3 ports. Here's basically what the GM replacement valve looks like:
http://cgi.ebay.com/ebaymotors/NEW-U...4506.m20.l1116
This guy wants $60 for it, but you can get it for 15-20 bucks. Mine looks like the one pictured, but Mine has a bracket with it.

[UNDERDOG1]

Does anyone have a pic or diagram of how to change a 6 port to a 3 and the hose routing etc. ?

Thanks.

[Pyrotechnic]

Originally Posted by UNDERDOG1

Does anyone have a pic or diagram of how to change a 6 port to a 3 and the hose routing etc. ?

Thanks.

Once I drop the tanks to replace the lines, I'll see if I can get some pics.

Thank you to all who have replied to this thread. It was a big help and I now have I good idea of what I need to do. I'm gonna go ahead and order that valve. Can't beat the price on it compared to all these parts store replacements that run $60 or more.

[joe231]

Originally Posted by 78 Chevyrado

I bought the service replacement from the chevy dealer on my no emmisions 78 c20. I have the exact setup you have, short piece of hose with a vent on the end (single fuel line) and the one wire hook up. The part number is 15580925 and is still available. You can get it at gmpartsdirect.com for $12-$13 plus shipping. At the dealer, mine was 18.53 with tax.

It's not exactly like the original but works perfectly. Instead of remounting it to the original hole, I found one nearby and rebent the bracket a bit and it was good to go with no other modifications.

If I can remember, I'll try to get a pic of it monday when I go up to the body shop.

That part number doesn't work any more...any ideas?

here is a pic of my factory 6 port...I'm looking to buy a spare, but can't find a single wire, 6 port





upon further inspection...it has Pollock stamped on it, it appears to be OE though...I haven't found a part number on it.