Under bed fuel tank recommendations

[Missyblue]

Hey again so we made some progress and removed our in cab fuel tank. I have been researching and Trying to figure out the best route for moving it. What I am hoping for is photos/advice/opinions on the matter of what works well and why my priorities/preferences in a perfect world are
1. No/very little frame modification
2. Needs to be adaptable to fuel injection
3. And I'm liking the idea of filling behind the license plate? I have seen some say they did it but cant find my saved post maybe that tank requires more mods to frame.
4. Trying to find a not $400 gas tank haha unless it's way worth it and installs itself 😉
I'm just hoping for advice on what does and doesn't work well I know mustang seems popular but theres so many others I read about just curious.

Any install photos would be great also.

Thank You thank you

[mongocanfly]

Personally I would look hard at boyds...your gonna need pump etc anyway and he has ready to go units.....the behind the plate fill generally isn't a good idea...it would put the fill on the same level as the tank.....it's gonna blow your 400 budget....there are other options...mustang,blazer,,to name a couple

[NorCalGal]

Just a FYI on the mustang tank,1965 tank holds 16 gallons and a 69 holds 21 gallons. The difference is all in the height. A 1969 tank is about 2 inches deeper.

[MiraclePieCo]

1968-69 Camaro. Fits 3100 AD with about 1/4" each side, 20 gallons, rear fill, available in FI configuration. Might be a challenge to run exhaust around.

[Missyblue]

Originally Posted by MiraclePieCo

1968-69 Camaro. Fits 3100 AD with about 1/4" each side, 20 gallons, rear fill, available in FI configuration. Might be a challenge to run exhaust around.

So it appears the exhaust vents right before the tank? Seems like the only option is trhat or before the back tires possibly is that correct?

[Missyblue]

Thanks for the advice. I forgot to mention that I do like the idea if the fuel pump being in the tank not external.

Mongocanfly so did the cars have issues with the fill behind the plate or is it just because of how it would sit in the truck?

Eo14575 So regarding fab work was it mostly for the cutout for the filler or fab for other things too?

Thanks!

[dsraven]

before you decide you may want to figure out what you want in the end. that way you don't spend money on stuff that will be replaced with something else later. make a list of your plans and research what will possibly have an affect on other systems. you mentioned an ls swap. does that mean you will possibly want independent front suspension, power rack and pinion steering and disc brakes at some point so you can steer easily and stop all the forward motion? possibly a differential swap for highway gears with rear discs and stabilizer bar? dual exhaust for the new engine? new trans cross member to support the then different configuration? power brake unit with dual system master cylinder? new wiring to support the new power plant?
the reason I ask is because a lot of these things will affect the others. for instance, as already mentioned, the fuel tank behind the diff will affect the exhaust routing due to proximity and space required for the tank. exhaust routed with dumps ahead of the rear bumper will cause oxides of nitrogen and other caustic airbourne agents to be released as well as water/steam. these can cause early rust formation on surfaces that are downstream of the exhaust dumps. there is also the heat issue from radiated heat from the exhaust and, of course, carbon deposits on those surfaces downstream. a new diff with stabilizer bar will possibly have an affect on tank placement, if the frame links are behind the diff, or exhaust placement, if the links are ahead of the diff. a tank with a fill placed low,such as behind the tag plate, will possibly be hard to fill because there is less drop from the filler neck to the actual tank. the original mustang had the filler quite a bit above the tank so filling was easier. some will put the filler in the bed. nothing wrong with that unless you plan to use the bed or have a tonneau cover. a truck with a stock ride height may be a little tougher to fill with an in-bed style filler simply due to the height so you may need to actually get into the bed to reach the filler. a filler in the rear fender will possibly require body work and paint unless you integrate a filler neck style like originally used in the cab-with a rubber insulated filler neck a hole could be drilled through the fender and a rubber grommet style neck holder could be used. the fuel cap would sit proud of the fender though. if you plan to swap the power plant to LS or some other style then you may be also swapping in a new trans cross member and engine mount set up. possibly even a firewall modification. this may also affect the exhaust routing and fuel/brake line routing along the frame as well as frame mounted brake booster placement. steering column clearance issues may dictate steering column and shifter modification, the accelerator linkage, wiring harness and lots of other things. just saying, be deliberate about what you change and why. consider how it will affect other things down the road. ask questions. less money spent on short term use items equals more money left over for flashy wheels, lol.

[e015475]

This is a Camaro tank from a 70 or 71. It is a little narrower than the earlier one. Filler goes through the license plate on the roll pan.



Here it is in the truck. There was a fair amount of fab work to get it in.



Mine is a stock new tank, but one set up for EFI and an in tank pump would save you a lot of trouble if you dont mind spending a few bucks

[nvrdone]

I went a little different with my tanks - yes tanks !! I used a pair of tanks out of an AD suburban and mounted them under the bed on both sides. I understand the "48 AD's had a tank mounted on the right side under the bed. Anyway, I made a crossover fill pipe so both tanks fill at the same time. then I plumbed the fuel lines into a "T" so fuel draws from both tanks. This gives me about 32 gal capacity. Has worked well for many years.