Adding second fuel tank and efi fuel pumps

[hoagster]

I Built a new bed from @TotalyHucked employer since the original was beyond repair from years of hauling loads of road base wood, you name it. Not mention a couple of tractor dings. The original bed had the oem fuel hole on the passenger side and Ford style and non oem tank on the drivers side. So I just built the new bed with factory holes on both sides. The frame is drilled on both sides for oem tanks. If your truck is not a looker buy a bedside with the fuel door.

 

[slammed84]

Seems like a bigger project than it's worth, but for the cleanest install, get a bedside with a passenger fill door.

 

[Grit dog]

Good points made by the last 2 responses. The options mostly boil down to appearance and what the plan is for the truck.
We don’t know if you’re wanting or already have a clean shiny truck or if aesthetics are less of a concern.
Fwiw, there was someone on here who made a jig to stamp the round recess like 70s squares into the bed side panel. Looked like a bit of effort to make the clamping jig but he made it out of scrap wood and all thread rod. Pretty slick imo if one wanted a clean 70s looking round fuel tank access without patching one in.

 

[Broken85]

Put a 40 gallon Burb tank in it and skip all the two tank switching horse ****. By the time you rewire, purchase another set of saddles, straps and new tank; re-plumb all the hoses, (do you have to drill the frame for passenger saddles?? I bet the holes are already there, but I don’t know) cut a new hole or re-skin the passenger side, you are talking probably over a 100 man hours for the same function.

Did the Burb tanks fill from the same door location as the C/K?? Not sure. It’s been like 20 years since I had a Square Burb, but the fill neck might already go right where you want it.

 

[Camar068]

Tank relocation:

https://www.gmsquarebody.com/threads/write-up-gas-tank-relocation.663/

 

[Grit dog]

^Agreed with @CalSgt, don't want it looking like a damned ole Ford lol. That's what they did for the forward tank on '73-79 trucks FROM THE FACTREE. Just cut a hole and sheetmetal screwed the neck to the bedside. Sticks way out and looks like

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****, that’s better than the aftermarket tank on the 77! Mine looks like wreck it Ralph did fuel tank installs.
Zoom in it’s fugly. Vintage fugly though, hahaha

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[Grit dog]

Put a 40 gallon Burb tank in it and skip all the two tank switching horse ****. By the time you rewire, purchase another set of saddles, straps and new tank; re-plumb all the hoses, (do you have to drill the frame for passenger saddles?? I bet the holes are already there, but I don’t know) cut a new hole or re-skin the passenger side, you are talking probably over a 100 man hours for the same function.

Did the Burb tanks fill from the same door location as the C/K?? Not sure. It’s been like 20 years since I had a Square Burb, but the fill neck might already go right where you want it.

Don’t disagree with this.
Buddy put a burb/blazer tank in his c10 and got the filler hose to run to the inside back fender well and welded a gas door out of….something, smoothed it in. Super slick fuel filler. Didn’t have to put any holes or patches in the rear fender.
Worth considering if doing a rear tank and don’t want to get into the sheetmetal.

 

[hoagster]

****, that’s better than the aftermarket tank on the 77! Mine looks like wreck it Ralph did fuel tank installs.
Zoom in it’s fugly. Vintage fugly though, hahaha

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That's what mine originally looked like.

 

[Ricko1966]

Don’t disagree with this.
Buddy put a burb/blazer tank in his c10 and got the filler hose to run to the inside back fender well and welded a gas door out of….something, smoothed it in. Super slick fuel filler. Didn’t have to put any holes or patches in the rear fender.
Worth considering if doing a rear tank and don’t want to get into the sheetmetal.

I don't see any reason a person couldn't do that with a factory saddle tank. Or even an in bed filler.

 

[Grit dog]

I don't see any reason a person couldn't do that with a factory saddle tank. Or even an in bed filler.

Good point. I think it would work in the front side of the fender well with a saddle tank. Especially since the OPs truck is short and easy to reach in the bed.

 

[winfred]

my set up in progress on a 78 c30 3+3 454, pollak valve, bosch 091 inline pump, 2 new 20 gal tbi truck tanks with their senders/pumps, feeding into the 091 through the pollak, 091 into corvette regulator/filter, this makes it a return system but only one line going up front to the holley 4150 terminator max, not running yet but close.
using the pollak to switch the relays for the intank pump, so the tank pump turns on only when selected

this is basically the same system i've been running in my 91 v2500 burb with a multiport 350, minus the 2nd tank and corvette filter (fuel rail return line system)
delphi tbi pumps last 7 ish years so far (just started its 3rd) the 091 has enough ass to keep it running while sucking though the dead lift pump, but it really weirds up the fuel map as it compensates

091 bosch fuel pump is originally from a 911 turbo porsche, it's the gold standard pump for import performance, the current real bosch unit is "69459" and $75 from amazon

 

[metal tech]

I'm doing an EFI compatible rebuild on my 84 K-10 and maybe some of what I'm doing may provide some help. I'm using 20 gal tanks, factory EFI sending units with in tank pumps compatible with E-85. I'm wiring each pump and sending unit separately to a DPDT Carling Rotary switch thru a relay. For the fuel feed lines, not so cheap way. Stainless steel hard line from each tank to one way flow valves from Earles, to a Y-fitting to a single line to engine bay. Using PTFE lined braided lines from each tank to the hard line and from engine feed line to regulator to carb/efi rail. You can go cheaper with pushlock fittings and matching hose vs PTFE braided line and Stainless hardline. My bed already has the gas doors on both sides so I'm no help on that.

 

[JBswth]

I have a 87 truck that has only the driver side tank. I would like to install a second tank on the passenger side. Ideas on the fuel filler? I was thinking i could just use a hole saw and put in a fuel filler from a mid 70's truck.
Also I plan on running EFI that uses 58 psi. I'll take some suggestions on fuel pumps, plumbing, and the fuel gauge. I though about plumbing both tanks to a single surge tank style fuel pump but the gas would have to be equal volume in both tanks all the time. I think there needs to be a crossover pipe and pull from one tank to the fuel rail.

If I were you, I would find one in a junk yard with dual tanks and remove the passenger-side bed side and the tank with associated hardware from it and replace your bed side with that one and install that tank, along with the valve, lines, etc. That will be a lot less trouble than trying to figure out how to do it differently.

J. B.

 

[9999]

I don’t know if it’s factory. But my 82 K10 short bed has the passenger fuel fill inside the fender. Hard to see unless looking for it.

Of course only the driver one has been hooked up since I’ve had it.