F100 - Relocating Fuel Tank to Rear

How- to step by step relocating the fuel tank to the rear of an F100. I use a 1970 mustang fuel tank, and install it in between the frame rails, under the bed of this 1969 Ford F100. In the next video, I'll install a fuel pump in the tank and get this truck setup for fuel injection.
Links:
Rock Auto 1970 mustang fuel tank:
www.rockauto.c...
Sending Unit- Rock Auto:
www.rockauto.c...
Wheel and tire setup:
Wheels ESR CS11 they are 19x9.5 in the front and 19x10.5 in the rear (both are +15 offset) Front tires are 275/35r19 Rear Tires 305/35r19

[@johnweisinger7390]

I made mine serviceable by putting nut-serts in the frame and mounted the tank from the bottom

[@pgmgallardo5045]

Have pictures of the fuel tank install? How are the nut-setts holding up?

[@johnweisinger7390]

@pgmgallardo5045 I may have some pics somewhere. I'd have to dig through one of my old phones. It's been 4 years and it's still holding up. Only thing is I'm just not a fan of how far it hangs down. Thinking about changing it to a tank in the bed and placing an old cut out steel Delta toolbox over it.

[@taco472]

FYI : A guy might look into a 64/66 Mustang tank, guys are using them in the same way and same place in 48/ 52 F1 Fords without cutting on the frame . The earlier tanks must be narrower because the F1 frame is about 3” narrower than the 53 and up F 100’s. The early tanks might be too narrow to catch the frame on later F100/F150’s but if you’re going to build a ‘picture frame’ to support it anyways than wouldn’t be a problem. Just a thought.

[@lesmaine232]

Can I ask what size of tires are you running? Brand, width and offset of wheel? Bolt pattern? I bought some P315/35/R20 Tires but I am having a tough time finding 10.5" wide wheels. Thanks

[@duanebennett2961]

They make gas tank mats that keep fuel to the fuel lines for the purpose of converting older cars to fuel injection...

[@brodyschmidt5579]

Love this build man, keep it up 👍

[@justinrennie9995]

Damn glad I watched until the end that thing looks amazing with the new stance

[@330_garage3]

Thanks! I should have used that picture of the truck at the end as the thumbnail! Glad you guys like it, I'm getting excited to get this thing on the road.

[@DragPakMerc]

If having the tank hanging down like that is a concern, you might consider using a '67-'68 Mustang tank. Length & width and mounting holes are identical, but they're shallower. You'd lose some fuel capacity, but it'd allow the tank to be raised two or three inches.

[@330_garage3]

Thanks! thats some good info

[@JesusOrtiz-qp1so]

What’s the size of tire your running on the back

[@lochnessfox3441]

I’ve got a 72 that I’m gonna do a similar build on and am watching your build for ideas and what to watch for along the way. Thanks again and stay safe!

[@330_garage3]

absolutely! Glad you are finding it helpful.. even if you say "well I wouldn't do that!" Thats what its all about.

[@0lddragracer426]

I really like your build, and following along, even though I don't always agree with everything you're doing. First, why are you moving the fuel tank out from behind the front seat and putting it at the rear of the truck? You can easily make a return line to the cab tank for injection by making a tubing insert with a return line connector on it, and fit it between the filler hose and the gas tank, using the filler hose and clamps to do it. Consider this....the tank being at the rear, is now subject to common garden variety rear-enders which could become catastrophic. I drove my 67' F-100 for 600,000k miles and never had a problem with the gas tank behind the seat. If you were in a wreck that could cause the cab tank to rupture...I doubt you would have to worry about it. My opinion is, your tank is a little low for my liking. My truck, until I shorten it, is a long bed with a factory 25 gallon aux fuel tank between the frame, behind the cab. The factory provided a metal skid plate for the tank. I'd think about doing the same on yours. To bring some strength back to the rear of your frame, weld in the inside of the frame, so they won't be seen... "fish plates," with holes inside of the plates for welds outside and inside the plates . You're doing great though, and you have strong problem solving skills. I'm following along with you, keep it up. :)

[@quick455]

Throw a Holley fuel mat in it and you won't have to worry about baffles. As big and flat as that tank is you can use one of their large mats and never worry about starvation.

[@pauldailey4477]

Are you going to stick with the "rat" paint job and sell it for 90K?

[@330_garage3]

hahaha if it will sell for 90K US dollars... I would sell it. I like the story the patina tells, I would like to keep it.

[@rosariozito1116]

Awsome setup im literally doing the same build on my 68 bump. I just ordered the explorer 8.8. With those +15 offset rear wheels how much space do you have to the rear fender? Love the setup, but im looking for a deeper dish look.

[@AndysDogHouse]

Hey Man. Nice job relocating the fuel tank. I really like the way the stance is. Thanks for sharing.🍁👍👍

[@330_garage3]

Thanks 👍 - I am really pleased with how this truck is coming together!

[@frankm8533]

Man nice build! Quality work very detailed vid. When I do my Ford ill try not to bother you to much lol

[@330_garage3]

hahahaha ask away! Lots of knowledgeable guys in the comments sections of these videos as well.

[@troysgarage]

Looks awesome! Need to get busy on my own builds! 🤦🏼‍♂️

[@330_garage3]

post up some videos when you do! Its always fun to see what you guys are building

[@martinmayhem7122]

Great job man on the install - I like how you showed us step-by-step how you made everything fit nicely under the bed. The stance is awesome on the truck, wheel and tire combo look great, and this is a great build am sure am enjoying watching! I have been following since the beginning. Your hard work is paying off, and you tips are helping many! Take care man and keep up the great work!

[@330_garage3]

Thank you! cool that you have been watching the whole build too. I'll keep the content coming!

[@REVNUMANEWBERN]

@@330_garage3 I'm wondering with the drain plug in the corner of the tank could you just put a fitting there for a fuel line IF someone uses a FRAME mount fuel pump???

[@FordF100World]

And just like that the frame is Por-15ed lol

[@330_garage3]

hahaha that was just some bad lighting probably... kidding! I started to make this video at the same time I was doing the 4-link, then the 4-link took priority.... I think the leaf springs disappear when the frame turns black as well... shhhhh

[@FordF100World]

Lol it’s magic 😜 killin it on the videos keep it up👍🏼random but are u apart of FordF100World on Facebook yet? TheCraig909 and ThunderHead289 (Ford KZbinrs) are 👍🏼

[@JesusOrtiz-qp1so]

I’m surprised of how much knowledge you have my friend your truck look amazing

[@330_garage3]

Thanks, I'll share what I know, if you guys are finding it helpful

[@robbiesmith6417]

Fix that trans am you are killing me using it as a storage shelf

[@330_garage3]

hahah the TransAm is up next on the chopping block. I have a pile of parts ordered for it, to do some videos on getting it started again, some panel replacement etc!

[@HattemMorse]

Love it man! It’s really starting to look like something haha! Once again, amazing work brotha!

[@330_garage3]

Thanks a ton! I'm really getting motivated again seeing it start to come back together.

[@no1but24]

Awesome build, those u bolts for the bed… I can’t stand them, after a couple years they don’t wanna come off, the nut breaks free from the clip and just spins, anti seize the bolts and nuts. I live in Michigan as a collision tech, I’ve seen brand new trucks have issues trying to remove the bed.

[@BrockGrimes]

Why not just tack a couple nuts inside the frame? You could still use the torx bolts. However, I hate torx fasteners (owned many jeeps).

[@330_garage3]

Thats a good suggestion... I was really stuck on making that F150 idea work... Tacking a couple nuts would have been faster than cutting more frame back.

[@georgespangler1517]

What is the measurements of the 70 mustang tank I'm building a 66 ford pickup,,, l used a 66 mustang tank in my 45 dodge worked perfectly,, but there to wide for the 66 ford

[@jpfanfic4226]

Looks Amazing!!! Love the series!

[@330_garage3]

Thanks!

[@georgespangler1517]

21/64 , lol. Your going to drive yourself nuts,, I have a plasma cutter but your better to use a cut off wheel for that, don't hang a tank from flange alone the weight of fuel will break welds and cause a leak,, always use straps kid..

[@punkinsgarageandpaint8299]

Use the gas door hinge that is on a side mount gas door but use the bed metal as the gas door face.. I love this truck!

[@danandyong6653]

Its an easy answer.. 1 gallon of fuel approximately 8 pounds. 20 gallons = 160 pounds. You're very close

[@330_garage3]

I'll be right back... i'm going to go down and guess the lotto numbers real quick, while i'm on a roll. Good intel, thanks for working that out

[@RoadratEddie]

Great job!....Have a '72, quick change rear, stock car front, 4 spd and 351 cleveland.....Going into shop in a coupla weeks for cam, TFS heads, roller rockers and lifters.......Spring time hope to put in either a 5 or 6 speed.....Keep the vids coming

[@330_garage3]

That sounds awesome! I hope you post some video of it... because I want to see it!

[@dabernathy215]

Except for the LS this is an awesome truck.

[@scottbrown1820]

I’m with ya. If you’re an LS fan find a Chevy to put it in

[@waynered9]

Why not. It's one of the most budget friendly V8 out there. Dollar per horsepower it's a no brainer. People have been swapping gm engines into Ford's since the days of the model t. I think you're just butthurt ford purists

[@nealpurdy1202]

@@waynered9 dont you mean since the time of the small block chevy... Before that ppl hoped up flathead v8 ford and t,a,&b banger motors... Ford guys get it...you do not!

[@waynered9]

@@nealpurdy1202 you have no idea lol. In the early days people swapped in whatever they could. Of there was a Dodge engine there they would swap that in, if there was a Buick or olds you bet your ass they swapped it. Whatever was on hand. Read up on it bud. You're butthurt by another ls swap

[@moec.5280]

Appreciate your response tonwheels and tires. Good job on videos

[@darreljenkins3888]

Awesome truck coming along, but should have kept the 390 in it. I just like keeping all Ford powerplant in this ford truck. My opinion, but I love this trucks looks👍👍

[@330_garage3]

I actually kinda miss that 390, it was simple, but made great power and sounded tough.

[@johnw3915]

That really was a great way to end the video. It looks really great, stay motivated, and have fun. I love the look

[@330_garage3]

Nice! Thanks for watching the whole thing.. always nice to hear when you guys like stuff... or don't.

[@robnelson8733]

Make floating nut plates and weld them to your frame. Makes installing and adjusting the bumper much easier. Works great for box mount bolts also.

[@Roosterjello]

John Madden truck builder..(because of the marker) lol

[@jdrivera6855]

You totally lost me at 33 seconds 🤦‍♂️🤦‍♂️🤦‍♂️

[@sharpie1069er]

Why would you LS a classic Ford truck!!!! Is nothing sacred anymore!

[@deborasirles5976]

love the videos have learned alot . like your tire and wheel combo can you tell me wheel size and offset and tire size please and name of the wheels . im doing the same thing with my 1966 f100.

[@five-oonsene545]

Another great video from my favorite channel!

[@330_garage3]

Glad you are enjoying it! Thanks!

[@jamesnester8256]

just curious, what tires do you have on front and rear; trying to decide what to do on my 66 f100. to give more aggressive stance. thanks

[@scottbrady5127]

You can buy a Mustang tank that is baffled and set up for fuel ejection, but they are pricey. When I converted my mustang to fuel ejection I used a stock tank and the drain for the fuel return. I haven't has any problems with it not being baffled, but I don't let it get very low on fuel just in case.

[@330_garage3]

Yeah I looked at some custom type EFI tanks, but you're right.. the cost is high. I'm super concerned about the thing starving for fuel, I really don't know why I have that fear, but I do. Nice to hear from someone with real experience, Thanks!

[@joshuapayne7186]

Any clue what the measurement is from outside of each wheel spacer? What made you go with spacers and a + offset, as opposed to just a negative offset with a deeper dish? Was it because of availability of the wheels you liked? Really appreciate the videos man, I used a lot of your guidance for my CV swap, and the 4 link is up next. Quality work man.

[@330_garage3]

I added a 2" spacer to each side. (I don't remember the explorer 8.8 width, but just add 4 inches to that) Finding a catalog order wheel with that much neg. offset is difficult. I had to push those wheels out to get them to fit between the wheel wells of the bed. Thats the only reason it has the spacers. Awesome to see you guys using these videos, hope this helps!

[@carbon310]

How flimsy is the gas tank? I'm thinking of welding shut the fuel neck and welding the neck on one of the rear corners to fab up a fuel door behind the tail light

[@adrianlujan173]

Sería bueno que hiciera videos también en español 🫵🏻😎✅

[@chalolmeza5615]

Love your videos man. Proud to say I’m following your build really closely

[@330_garage3]

I appreciate that!

[@JesusOrtiz-qp1so]

I would like to know if you do jobs on other trucks other then yours I have a 1967 f100

[@330_garage3]

not much, mostly just work on mine

[@dillanhamilton]

Bought a rear tank kit from lmc for my 65 f100. Gives option to use straps or mount to frame from bottom and 17gal. Used same style of fuel pump

[@330_garage3]

and you didn't have to trim the frame or anything right? That seems like maybe what I should have done. Where did your filler neck go on that one?

[@clifalton3615]

On the fuel tank I think I would have welded a bar in front and in back of the tank and took a measurement for tank straps and pulled the tank to the bottom side of the frame and if you want you could put straps on the bottom as well

[@nealpurdy1202]

A bronco 2 tank might of been a good choice for rear and fitment plus efi. But i get that mustang tanks are cheap easy to find and work. I still miss that sweet 390 you built!

[@330_garage3]

I wish I would have come across the bronco 2 tank idea when I was doing my research. It seemed like everyone was doing the mustang. I miss that 390 too, that was a fun driving motor, it was simple but made for a fun cruiser.

[@danthisguy8541]

Hey awesome build! Whats the tire and wheel setup front and rear?

[@donf1006]

Nice job!!!! I don't know if this applies, but on my 64 I kept the inertia switch out of the crown vic for a fuel cut off in case of a accident!!!! 🔥😱

[@330_garage3]

Yeah I didn't grab an inerta switch.. that would be a smart idea, and could get one from a junkyard for cheap!

[@austinmclaen4007]

Buy an aluminum fuel cell for $250 and fuck the shitty mustang tanks

[@fattycatty]

It seems to me that you could of just gotten a tank and strap kit for a 76 or so f100.

[@330_garage3]

There has been some discussion about that, but no one seems to know if the 76 and later frames were wider... Other people have mentioned bronco tanks etc as being better solutions than cutting the frame like I did.

[@mmarmino]

Really awesome videos! Helping me a lot. I've got a 69 Ranger and im following right behind you.

[@330_garage3]

That is awesome! Post some videos as you make some progress. And be sure to watch what I do wrong, so you can make better choices haha

[@dylanwallace1104]

Luv the truck bro could not have picked a better engine, one of the very few Ford's i would drive willingly.

[@330_garage3]

hahaha drive willingly - Thanks!

[@morgansword]

I have had two trucks that the tank was mounted low like that and it ended bad for both. Unless your going with a skid plate, figure on a road hazard and hole in tank. Its your truck so do what you want but mine was even with the rear end center section and got hole in it

[@330_garage3]

Dang man... where are you driving?? Sounds like some Dukes of Hazzard action haha!

Your F100 will be like "Fast & Furious" style!

[@depayton1979]

What's the size, offset and backspacing on the wheels?

[@kensnell6799]

sad to see a beautiful oil ford truck ruined with a G.M engine why not do a G.M.

[@davidrobinson5943]

Truck coming together real nice l like that stance thanks for sharing your content plz keep coming I have enjoyed this build

[@330_garage3]

Will do. Thanks! always nice to hear you guys are enjoying the content

[@MissionRestomod]

Should have went with the Tanks Inc tank. That’s what I am using on my 63 Falcon.

[@330_garage3]

Yeah, I was trying to do this without spending a ton of money.... but that just translated into more time and fabrication...

[@yeboscrebo4451]

Once you lower that front end, that stance will be perfect. Put that filler cap door on magnets or something, make it cleaner than hinges.

[@330_garage3]

Thanks, I was going to get a gas door from a junkyard car, and tack weld it under the bed, so you wouldn't see a hinge. Then it would work like a gas door on every other car... we'll see if I can figure that out haha

[@kz4506]

We just cut the tank down and put a back cross member in and it worked and a flexible strap under the tank , there’s room on the frame rails to reset a nut for the deck normal hight

[@330_garage3]

That would have been a good solution for me.

[@underconstructiongarage]

What backspacing on the rear wheels, and are you still using a wheel spacers

[@midlifecustoms]

Great job. I did the same in the 65 and 67 F100 that I restored.

[@330_garage3]

nice!

[@oscarponce455]

Hi there, what size wheels and tires are you running. I gone have the same set up.

[@omarramirez2335]

Went from a rusted frame to a fresh coat of black on it what did you use to paint it?

[@mannygarcia5451]

Like the men's Wear House it's genuine, "I guarantee it!".

[@Shahska1]

Well now that you have done all that work to the frame you need to address the body get rid of the rust and paint the truck

[@330_garage3]

But look at the story all that patina tells, it would be so sad to paint over it

[@kennacraftjr.6513]

You could have used a air hammer and massaged the edges of the tank inward.

[@mikek771]

Your not going to like the noise of the Walbro pump. I took mine out after 2 days. I put a Quantum pump in. Big....big difference.

[@330_garage3]

even with the fuel pump in the tank.... it was loud? I'll keep the Quantum pump in mind...

[@mikek771]

@@330_garage3 yes. I even filled the tank to quiet the pump. Still was loud. Your doing a great job on the truck.

[@georgespangler1517]

Best solution is 1952 Chevy tank.

[@logannauman5833]

How thick is the metal for the 1x1 box tubing ? Or does it matter ?

[@330_garage3]

I think that steel was 15ga or 16ga wall thickness. Its not holding a ton of weight, so no need to go much thicker than that.

[@Snakez011587]

Looking awesome. I have a 67 f100 (was my grandpa's) that needs a motor and I am just getting real anxious to start working on it. I have an 85 F150 with the 5.8 4V HO motor and debating on using it as a donor but would rather rebuild the original 352. Time will tell I suppose.

[@330_garage3]

I would rebuild that 352 into a 390, it will look the same on the outside.. hell you can run the 352 stickers on it, so the purists don't wear you out about it haha. That would be the quickest way to go and make great power

[@Snakez011587]

@@330_garage3 *checks bank account* maybe in a few months 😀

[@fjarroyo8982]

The truck is turning out awesome!!! I've been following you for a while now and I also I'm in the process of building my 73 f100. It also has the crown vic suspension and I'm putting in a 6.0 too. My ? Is after I installed the suspension I noticed that i have a bigger wheel gap towards the door I followed ur every step and I don't know how it ended up like this, what do you think happened or what I'm I doing wrong??

[@330_garage3]

Thats how most guys install the CV front end, it bumps that front wheel center line forward 3/4" or something. Mine is the same as yours, the idea is that it actually sits more centered in the wheel-well than the factory suspension did. That wheel-well line isn't really symmetrical with that more open 'swoop' towards the back. Sounds like you're right on track!

[@fjarroyo8982]

@@330_garage3 yea it is 3/4" more I must be in the ball game then!! Thanks for the reply!!

[@tommyreynolds5914]

go over what wheels you used and any problem finding them

[@330_garage3]

I put that info in the video details section, no issues finding wheels in those sizes, there are a lot of choices

[@fikascore]

so if you need to service your fuel pump, do you have to remove the bed?

[@doinstuffdrinkin]

You are an inspiration! I'm getting ready to change the gas tank in my 73.

[@330_garage3]

Go for it!

[@imachacker]

Looks awesome whats the wheels? Are they the 19x9.5s+15s in the rear? Or did you go wider

[@330_garage3]

ESR CS11 they are 19x9.5 in the front and 19x10.5 in the rear (both are +15) running 315s in the rear. Thanks!

[@imachacker]

@@330_garage3 awesome set up! I was trying to see what i wanted to do for the rear, i think the sr01 10.5's are a bit too wide for the mustang irs

[@chaphantom2191]

97 f250 fuel tank fits in the rear

[@codyburns4623]

The only tank width I can find is 24.5

[@rodriguezadventures865]

What wheels and tires are you running??

[@330_garage3]

I listed the details for wheels and tires in the description, a lot of questions on those

[@garysells4259]

You can actually use a early 70s Maverick gas tank slides in

[@330_garage3]

Thats a cool suggestion - hopefully other guys read the comments section here! Thanks

[@devinpena10]

Didn't you just jeopardize the Integrity of the tank by putting those self tapping screws into that frame you made I believe the tank is welded along the outside of that stamped flange and you drilled holes on the Inside Edge of that pretty sure those tanks are supposed to be strapped in not screwed in

[@pwrbyford68]

They’re screwed in, my 68 mustang has the same tank.

[@330_garage3]

You can actually see a line all the way around that flange in the tank, where it was somehow press-welded to make an air tight seal. I kept the screws on the outside of that seam / press-weld mark.

[@justziptieit8428]

For anyone else doing this, tanks inc has a 22 gal cougar tank that you can get set up for their in tank electric pump. A 1X1 TUBE frame will allow you mount the tank underneath the frame. Also despite what it seems, you don't have to put an LS in your ford. I would give you thumbs down for it, but the video was great. 👍

[@georgespangler1517]

Just did my 66 pick-up found a 52 Chevy tank is best way to go , only had to move front little cross member 2 inches and still clears rear and it has hole for pump and cover if you don't use it,, has side fill much better to fill from side,, only had to cut 3/8 inches off bottom of frame rails,, and it won't hang down only 6 inch deep,, really takes from rear leaf spring integrity to move the rear cross member back that much,, will give you deflect and wheel hop.

[@TFFTR1]

What size wheels & Tires are you running?

[@amorgan93]

Just found your channel after getting my 77 f100 to fix up. Love it, make some more vids!

[@c50ge]

How did you make the tank work with fuel injection?

[@330_garage3]

I am working on editing that video now... but spoiler alert, I used an Aeromotive in-tank fuel pump hanger system.

[@JoeRocket-sf6qs]

My 93f150 has a rear tank,dual tanks in it.

[@johnweisinger7390]

Unfortunately they won't work in a bump. Ford widened the rear frame 4 inches in 73

[@CharlieMetcalf]

Thw stance looks really good even with the front too high. Looking good! Now lets go drive this thing!

[@330_garage3]

hahah thanks! I'm really excited to get this thing into burnout mode!

[@ronnietyree8316]

Did you try a 1979 gas tank??

[@330_garage3]

No, some of the people in the comments section have had really good ideas and solutions for other tanks. Almost wish I could have made a pre-view video and had that info before hand

[@ManuelHernandez-cn9fd]

Hey man! Currently doing the ls swap in my f100. I have one question and it’s what rear differential do I use for the swap? One that fits in the rear?

[@cornyfriesen7160]

What if he just put the gas tank in the other way??

[@robertarthurs328]

Dimple the corners of the tank

[@Shadetree_Mechanic]

Liked and subscribed!

[@PauloLima-bm3eo]

The Truck is Awesome 👌

[@nitcat1]

Nice work. Looking forward to seeing how you make the fuel pump, sending unit and lines work.

[@330_garage3]

Thanks! thats actually going to be the next video.

[@ronpanozzo5584]

LS in a ford🤦‍♂️

[@jimgould2829]

It's a dirt cheap ass way to 600 hp🐎 with the turbo set-up lol I'm a Ford guy too but it's still an awesome build

[@MG-sg2ci]

@@jimgould2829 Exactly. And ford doesnt make a comparable engine. Coyote is just too expensive.

[@jimgould2829]

@@MG-sg2ci Right you could get a junkyard 351W and do a mild build but its bigger and heavier even with aluminum heads...

[@MG-sg2ci]

@@jimgould2829 And no fuel injection.

[@johnweisinger7390]

It's called hot rodding. Back in the day when they were putting Caddy engines in 40s Fords and 350s in 20s-50s Fords no one cared. Now you put a LS in something other than a Chevy and their simple little minds can't handle it.

[@craigfiles7067]

Why didn't you just use L channel a gross the frame rails front & back of the tank & bolt it all to the lower section of the C channel frame that would have been easier & stronger