Under bed gas tank with side feed?
 

All I am in the process of trying to find a gas tank to fit under my bed on my 55.1
GMC-100 with a Flat Out C4 suspension.

I want a side feeder and do not want to have to fill from the bed.

Open to all suggestions and Ideas!

Thanks Much!

Re: Under bed gas tank with side feed?
 

some ideas

67-68 Camaro
https://67-72chevytrucks.com/vboard/...569491&page=12 Posts 281 and 320

80s S10 blazer
https://67-72chevytrucks.com/vboard/...d.php?t=615024 post 6

and 1950 ford sedan tank (the price was right!)
Attachment 2362748

Re: Under bed gas tank with side feed?
 

67-68 Camaro Link no worky

Re: Under bed gas tank with side feed?
 

fixed


https://67-72chevytrucks.com/vboard/...569491&page=12

Re: Under bed gas tank with side feed?
 

Here is mine. 48-52 Chevy sedan.
I made a protective shield for inside of the bed.

Re: Under bed gas tank with side feed?
 

Oh, I got it from 'Tanks', so it's EFI ready.

Re: Under bed gas tank with side feed?
 

I put filler on the top of LR fender.

Attachment 2362816

It is slower filling that I expected. I also can't run a locking gas cap, at least not in the rain.

Side of the fender would be a straight shot into tank, but maybe look funny unless you did a gas door. But the door would have to be in a highly shaped section of the fender.

Or move it down and back on the fender, more towards taillight.

Or where it is but with a gas door and better vent. hmmm, maybe next winter

Re: Under bed gas tank with side feed?
 

67i/72 Blazer/Surburban tanks are 13 inches tall 15 inches wide and 26 inches long and will fit behind the rear axle. 20 gallon tank.

You would probably have to mount the filler in the fender with that tank though,

Sending unit matching your gauges , how tall it is top to bottom and where the filler neck attaches are three things to consider along with width and length. There are some real easy to find tanks that don't cost a lot that just are too much trouble.

I've got a neat 20 gallon aluminum tank in my 48 now but it is bed fill and hangs down lower than I like and this time around the back end of the truck is coming down about three inches at least.

I've also got a 77 Blazer tank that a guy gave me when I bought a bunch of other stuff from him years ago. it is 25 gallon and is 28-3/4 x 28-1/8 x 10-3/4. It has an expansion hump on top that may take up more room than I want to give up though.
https://hosting.photobucket.com/albu...720&fit=bounds
I've also got a 40 gallon Burb tank to put in my 71 if it will fit and the 71 may get the Blazer tank.

Re: Under bed gas tank with side feed?
 

I had the same 70s blazer tank, it would have hung a lot lower than I wanted.
Attachment 2362818

the filler takes up the space between floor and frame, then over half the height of the tank hangs below the frame.

Re: Under bed gas tank with side feed?
 

3rd gen Camaro tank looks like it might be useful as well:

Attachment 2362899

Re: Under bed gas tank with side feed?
 

I've been wondering about that part. It will probably end up in the 71 as the 40 gallon is pretty wide and won't fit between the rails. I've got two projects ahead of the 71 getting it's turn now that my shoulder is about 75% functional.

I've got a 74 F150 tank that came with a nine inch I bought that may be the tank of choice. For me gauge senders aren't an issue as I am not using GM gauges. Gauges of choice are secret squirrel stuff right now.

Re: Under bed gas tank with side feed?
 

Way back when I first brought the 75 Blazer tank home I stuck it under my frame for a test fit. It does hang down but I am going to put a new crossmember at the rear of the frame like I did on my old frame and that would let me raise the top of the tank and the top of the lines and hoses up about even with where the top of this crossmember sits now.

https://hosting.photobucket.com/albu...720&fit=bounds

https://hosting.photobucket.com/albu...720&fit=bounds

https://hosting.photobucket.com/albu...720&fit=bounds


74 F 250 tank in it's natural habitat.
https://hosting.photobucket.com/imag...720&fit=bounds

Re: Under bed gas tank with side feed?
 

custom build the tank of your dreams. have a welder do the actual welding if you're not up to the task. have the metal bent at a local sheet metal or fab shop. tack it together and then take it to your welder dude.install some baffles for anti slosh. put the fuel filler up as high as you can with a good vent line so as you fill air can escape easily. also install a ground wire from the tank to the filler neck and to the vehicle frame to take care of static when filling. you will get what you want and the cost still won't break the bank, likely. sometimes the local welding shop welcomes a one off project to break the monoteny of the everyday. sometimes a welder is simply doing side jobs for cash and has a buddy with a sheet metal break and shear.

Re: Under bed gas tank with side feed?
 

The 79 ElCamino that I horse traded for for my son had a custom made 40 gallon tank, The bill for the tank was in the glove box and it ran 250 in 1985 dollars. Paper work in the glove box said that who ever had the truck at that time made regular runs between Tuscon and SoCal and I'd have to believe that they were running gas from Mexico as running across the border and filling up for about a third of what US prices were at he time was pretty common then. Thing is, with material and labor costs what they are that 250 buck tank would run between 5 and 6oo now.

Re: Under bed gas tank with side feed?
 

I am not at home to measure mine for about a week. I don’t know how much room you’ve got between those frame rails.
I used this one in a big kit then I notched the Frame rail and heavily fish plated it outer rail.
Taking hose up and out through the side of the fender with one of those Gas, cap free fillers you just put the hose in and go, and a push pop open door. Installing a one-way valve in the fuel line to keep it from slashing back out since there’s not a lot of drop from fill to tank.
Ended up upgrading to Aeromotive in tank pump. Just didn’t like the looks of that one that came with the kit and didn’t want to remove it later.
I notched my frame rail, so the tank and all will drop straight out the bottom if I have to.

Re: Under bed gas tank with side feed?
 

Some pics

Re: Under bed gas tank with side feed?
 

C10 tank:

Classic Performance Products CPP ‘67-72 -20 gallon EFI fuel injection gas tank, pump,lines, fittings

Re: Under bed gas tank with side feed?
 

Talking about making it work!

But I guess isn't that what its all about, looks great!

How many gallons on a C10 tank?

And what suspension are you running?

Re: Under bed gas tank with side feed?
 

I think this one is C10 at 20 gallons but maybe different stock one

Re: Under bed gas tank with side feed?
 

https://www.tanksinc.com/index.cfm/p...rod/prd383.htm

I used an El Camino tank in mine. I did have to notch the frame to clean the filler neck.

Re: Under bed gas tank with side feed?
 

I don't see anyone bringing up exhaust routing, and will you have clearance between the rear axle and the tank. C4 rears don't have much upper clearance like a standard tube axle to dump at the bumper. That is the reason I picked the 18 gal, being it gives space to route each side over the axle and between the frame and the tank.
You could nascar it and dump before the wheels.

Re: Under bed gas tank with side feed?
 

Ran mine as shown. Fills nicely with no burps. Used a stock 25 gallon k10. Having a 4" lift allowed filler and breather to easily be run over frame with only a small inner bed cut. Easily fills and takes locking cap just fine. Only 2 regrets. First was not assembling bed completely before tank install as reaching one row of bed bolts is going to be hard. Second the 25 gallon capacity is nice but at near $6/gallon very painful.

Re: Under bed gas tank with side feed?
 

What does a tank need to be to be LS ready?

EFI/ High pressure/ pump inside tank?

When looking at these older variety tanks what should I keep in mind
for making the tank work in my favor?

This C4 issue of not to much room to dump the exhaust out the back end is a concern to me.

Re: Under bed gas tank with side feed?
 

A tank with internal baffles around the pump or the pump inside a bucket
a pump that can maintain something like 55-60 PSI
fuel return line
vents, filler, fuel sender
Either a filter with pressure regulator or a fuel rail with built in regulator or a separate regulator
Easiest way to get all that is use a GM EFI tank.

If the tank has a standard GM fuel pump opening you could use a autoparts store pump and drop it in.
You can also buy pumps setup to fit into old school style sender openings: https://www.tanksinc.com/index.cfm/p...rod/prd227.htm So you could use an old tank or repop old tank but you might suffer slosh induced loss of pressure when the tank is near empty

Or coble up your own mount plate with vents, return etc.

There are external pumps sold to work, but they all have bad reputation of not lasting. Internal pump is the standard.

The pumps themselves are something that has suffered from import junk clogging the distribution system. The internals of the pump are nothing special, but with so much cheap stuff out there it is hard to find a good pump economically. I have not dropped the tank on my last swap to stick in the $200 genuine Walbro, so far it is running great on the $50 Acdelco brand pump designed for a pre LS era 2.2 that I put in a year or so before the swap. YMMV dropping full tanks to swap pumps is a pain.

Re: Under bed gas tank with side feed?
 

I agree with the hassle have known some guys as well as myself that put a brand new one in got it all in place and it was defective. That can be very, very discouraging depending on how hard it is to get to the pump. My kit came with generic brand Chinese pump and I just couldn’t bring myself to put that thing in there even though I designed my tank to drop out the bottom. Can sure cost more, but i’ve been trying to buy as much USA as possible so I went to the Aeromotive in tank pump. Great reputation, they will talk with you through the installation, it’s what they do, so good at it.

Re: Under bed gas tank with side feed?
 

Any GM EFI/TBI tank can work. Then it will be baffled, have return port, breather and can take a combo pump/sender. Then, say an in-tank Walbro or Aeromotive pump for longevity. In the tank, the fuel surrounding the pump will run cooler, so minimize the challenge of " how far can I go on this tank". It shortens the life of the pump.
I just went for the 'Tanks' 50 Chevy for size, EFI ready, custom sender capable for the Bosch gauge and filler location... and it was about the same as anything else new. I think cheaper than what some are charging for the custom between the frame aluminium AD Chevy truck tanks.

Re: Under bed gas tank with side feed?
 

I purchased a Boyds Welding LLC 63-72 Side fuel tank, set up for my EFI,
this is on my 58 Cameo and planning on filling just behind the Cameo Taillight
to gain access to the gas fill.

You might want to look over there tanks to see if one will work for your truck?
Happy with mine so far!

Allen

Re: Under bed gas tank with side feed?
 

No matter how you do it getting the tank out of the cab is the best thing you can do.

Re: Under bed gas tank with side feed?
 

Forgot to say i am using C4 Front and rear on my truck also with Flat Out Engineering kits.
For what its worth.

Allen

Re: Under bed gas tank with side feed?
 

did you run tailpipes out the rear past or under the tank? That is one of OP's concerns.

Re: Under bed gas tank with side feed?
 

Haven't gotten that far yet, but plan is to run my exhaust up and over each side of the center of the diff OR just under the center of the diff.
I've seen it done both of those ways on other trucks and seams to work? and then maybe along side the tank and out each side?

Got my oldest Son, my Engineer, looking at it to determine the best route, Lol..

Allen

Re: Under bed gas tank with side feed?
 

Originally Ran mine down before tank due to concerns. The ungodly drone made me reconsider fast and ran them under tank but with sufficient heat clearance. 4" lift gives you many options you don't get on stock or lowered.

Re: Under bed gas tank with side feed?
 

I'm doing the same with a C4 FlatOut Engineering Kit on my 55.1 GMC 100!

Re: Under bed gas tank with side feed?
 

A 68-70 El Camino fuel tank has the same dimensions as the amount of room I have available for a tank which is 42 x 25 x 9!

I do want a side feed into the fender on the drivers side.

Have any of you tried that tank in your AD truck?

And if so how is it working out for you?

Summit has them for 329.00 with notched corners and set up for efi!

Re: Under bed gas tank with side feed?
 

Jim Carter has reproduction Suburban tanks. Maybe that would work.

https://oldchevytrucks.com/meg149.html

Re: Under bed gas tank with side feed?
 

I am going with a 68-70 El Camino tank from Summit ( Tanks inc.) that is EFI ready.

I want a side fill via drivers fender and I think this will work for me.

Re: Under bed gas tank with side feed?
 

on my 57 I put the filler door on the topof the raer fender behind the wheel. it has to sit far enough out for the door to clear the body when it is opening. i used a filler door from a scrap envoy I had laying arond and bent it to fit the shape of the fender. my tank is a belly tank along the inside of the frame and 1/2 way under the cab so it has a bit of a run to get from the filler to the tank. it works well as far as I can tell when filling with a 5 gallon gas can tipped upside down. no burps, fills quick. the filler entry is inside the fender and is a stock envoy filler which has been shortened a little to fit the hose over the frame. the hose from the filler to the metal filler pipe was just generic fuel hose from the hydraulic shop.

Re: Under bed gas tank with side feed?
 

here is my gas filler location

Re: Under bed gas tank with side feed?
 

Beautiful!

Re: Under bed gas tank with side feed?
 

This placement allows easy filling with little or no spillage if careful. It also allows the nozzle to rest away from fender, bed and rear bedpost while filling. No its not touching post but resting on edge of brake light support. I use a vented locking cap which also works well.