What keeps me up at night...

[SpeedlabDan]

Anyone have any luck, experience or luck with a surge tank in conjunction with a vortec Efi system? Particularly the L18 8.1l I'll be running? I'm swapping my engine and hopefully keeping both tanks...
Long story short, the selection valve only uses a 5/16 return port and the return on the vortec is 3/8 causing fuel psi spike.
An option is using a surge tank. The fuel is pressurized through the tank from each tank depending on the selected. The return is run to the tank in stead of the selector.
My thought is that if the return is put in to the pressure circuit it may still have the same effect on overpressure.
My brain fart; run a separate port back to the return on the selector but this may be redundant. There's still only a 5/16 port to bleed to....
Let me know what you think as this is ruining my sleep schedule

 

[Bent77]

I abandoned trying to use the TBI style tank switching. I am curious on your outcome

 

[SpeedlabDan]

Two switching valves utilizing the second for return only???

 

[Bent77]

If to had to redo it, I’d run two valves and a frame pump, so the pressure would not be against the valve but after.

I finally went Burb tank after the axle and am pulling the saddle tanks

 

[SpeedlabDan]

This is a possibility, if I could switch the return with the selector valve?

https://www.electricsolenoidvalves....DY-LM9PopXcgbBVMUaK5yoWaS2Qv7INBoCp54QAvD_BwE

 

[SpeedlabDan]

It's half inch npt but I bet I could find a 3/8 ss version

 

[SpeedlabDan]

If to had to redo it, I’d run two valves and a frame pump, so the pressure would not be against the valve but after.

I finally went Burb tank after the axle and am pulling the saddle tanks

Those pumps typically push better than pull, guessing you're using an in line pump. Is it pulling off the tank well?

 

[Bent77]

Those pumps typically push better than pull, guessing you're using an in line pump. Is it pulling off the tank well?

I dropped a TPI pump into the tank

You planning on running 2x those solenoids?

 

[skunked]

You guys and your saddle tanks.

 

[SpeedlabDan]

I dropped a TPI pump into the tank

You planning on running 2x those solenoids?

It's a possibility

 

[frankin5]

This might work
https://www.amazon.com/ACDelco-U700...coding=UTF8&psc=1&refRID=H8TH178CK7WCJMSRVZPG

 

[SpeedlabDan]

You guys and your saddle tanks.

Ya got me! I guess I'm more of a "Form and function" guy. I can't wrap my head around having useless side fill doors plus it's a pure thing about a 3+3

 

[SpeedlabDan]

This might work
https://www.amazon.com/ACDelco-U700...coding=UTF8&psc=1&refRID=H8TH178CK7WCJMSRVZPG

I believe that's a stock replacement. If so it's still only a 5/16" return barb

 

[Bent77]

5/16" return is enough.

But Id seriously consider the total cost, then just abandon the saddle tanks...

 

[SpeedlabDan]

5/16" return is enough.

But Id seriously consider the total cost, then just abandon the saddle tanks...

Check Larry's thread. The 5/16 return caused a spike in fuel pressure to 100psi, I'm not sure if it's different from an 8.1 to say a 6.0 as far as fuel demands. I'm trying to map out this build before I start throwing money at it to see what sticks

 

[Bent77]

Yeah I haven't read all the details in that thread.
I would suspect I reasonable change in the base specific fuel consumption commiserate with the difference in the engine sizes.

I paid $100 for the burb tank and $60 for the pump. Just a thought.

 

[imiceman44]

Ya got me! I guess I'm more of a "Form and function" guy. I can't wrap my head around having useless side fill doors plus it's a pure thing about a 3+3

I was building a 3+3 and I added a suburban tank used as main and kept the saddle tanks for backup with transfer pump
80 gal total

 

[skunked]

Why not split the return so it feeds to both tanks if you’re worried about it?

 

[Bent77]

How would that work with both tanks already full?

 

[SpeedlabDan]

I was building a 3+3 and I added a suburban tank used as main and kept the saddle tanks for backup with transfer pump
80 gal total

That's an idea just hard to monitor the tanks for level, I'm sure the pumps don't like to run dry