1987 LS swap , dual tank, primary left side in tank fuel pump & Right side tank convert to a transfer tank setup to fill left tank anyone done this?

[Jarhead1962]

1987 LS swap , dual tank, short bed. I have the left tank converted to a hi pressure in tank dual fuel line setup. I would like to make the right tank a transfer tank to fill the left tank as needed while traveling down the road. I would like use the existing left/right selector. Any ideas on how to plumb and wire up.

 

[Grit dog]

That just sounds like a cobbled up nightmare with the risk of fuel spill…
If you actually have an 87 (your sig says 86) and the wiring, valve and switches work, then you’re just 1 fuel pump/sender away from having a properly operating dual tank truck.
Don’t booby trap it for the next driver or owner….(I know, you’re probably “the only one you ever let drive it” and you’re “keeping it forever.” But schitt happens, so just set it up right the first time.

On the flip side, what you want to do is easy if you want to tap another hole in the L tank and put a pump $ (inline to be cheap, since you don’t want to put the right pump in the other tank), and a new carb fuel pickup $, and rewire the cab switch when you could just use a toggle $ (better learn how it works now before intentionally messing it up).
Seems easier to just do it right at that point.
Presuming the truck isn’t a junker if you spent the time and $ to LS swap it, so don’t make it a piece of chit on purpose.

If you couldn’t tell, I got the pleasure of reversing a few cheap weird dangerous hacks in my 86.
Don’t be that guy!

 

[TotalyHucked]

My buddy has this setup on his '86. LH tank feeds the engine, RH tank has a transfer pump in it plumbed to fill the LH tank. He's got an aftermarket switch on the dash, I'm not sure how you'd use the factory switch (I've never worked on one, have no idea how they're wired). It works well overall and has been fine for years, but if he forgets to flip the switch back, it will overflow the LH tank. He's done that numerous times going down the road.

My '85 is a single tank truck and I would like to add a 2nd tank, though I will probably just put a balance tube in and fill from the LH. Then rig up the transfer pump to a switch. I roadtrip alot so having more than 16gal would be great

 

[75gmck25]

Maybe simplify your life and swap to a single Blazer or Suburban tank at the back of the truck. Not sure if the big Suburban 40 gallon tank fits, but I know that folks have swapped the smaller tanks.

 

[Camar068]

Maybe simplify your life and swap to a single Blazer or Suburban tank at the back of the truck. Not sure if the big Suburban 40 gallon tank fits, but I know that folks have swapped the smaller tanks.

32 gallon fits fine. If you've got both tanks and have the valves, etc, put a sender/pump in both tanks and switch from one to the other.

I did the 32 gallon tank swap, but if I had all the stock hardware for both, I would have done both tanks.