Dual exhaust & moving the selector valve

[Texas CB]

Still getting the gremlins worked out of my 351W swap. Added BC headers and a true dual exhaust when we did the swap. With the new exhaust running down the inside of the driver rail, I had to move the fuel selector valve in my 77. Originally made a bracket, flipped the selector horizontal, and put it way up against the tub (and I have a 1" BL). It was out of the way but ended up starving the engine for fuel- way too high.

I finally figured out what was wrong last night when I took the selector back down to rail height and flipped it back vertical. Truck started to run right away again. So my question is this- how high up can I put the selector, and does it matter if it is horizontal or vertical? When I was experimenting, I zip tied it to the brake line just to drive around the block, and it was maybe 2-3" higher than stock. While it drove fine, I did notice I really had to crank it awhile trying hot starts. Before it just took a key bump.

So do I need it at stock height for it to work? Does this mean I need to reroute everything and put it on the outside of the rail? I am curious what everyone else with dual exhaust has had to replumb?

 

[blubuckaroo]

Still getting the gremlins worked out of my 351W swap. Added BC headers and a true dual exhaust when we did the swap. With the new exhaust running down the inside of the driver rail, I had to move the fuel selector valve in my 77. Originally made a bracket, flipped the selector horizontal, and put it way up against the tub (and I have a 1" BL). It was out of the way but ended up starving the engine for fuel- way too high.

I finally figured out what was wrong last night when I took the selector back down to rail height and flipped it back vertical. Truck started to run right away again. So my question is this- how high up can I put the selector, and does it matter if it is horizontal or vertical? When I was experimenting, I zip tied it to the brake line just to drive around the block, and it was maybe 2-3" higher than stock. While it drove fine, I did notice I really had to crank it awhile trying hot starts. Before it just took a key bump.

So do I need it at stock height for it to work? Does this mean I need to reroute everything and put it on the outside of the rail? I am curious what everyone else with dual exhaust has had to replumb?

If you needed to move the selector valve from it's original location, why not just install an electric valve. A good location is just rear of the aux tank on the frame rail. That location makes the suction side for both tanks as short as possible.

 

[Texas CB]

Its electric already- didnt realize thats not OEM as I have nothing to compare it to. Was the 77 not electric? Rail height is too close to the exhaust now that its dual. Putting it on the outside rail on the drivers side is do-able but over by the shackle with the reserve tank in place. Wasnt sure if that was a good spot or not.