Gas Tank

[flabbychucs]

I was wondering where you can get replacement gas tanks for these trucks. Mine looks like it was the victim of years of rock climbing and a few days after filling it up, half of it has leaked out of several different rust holes, dents, ect. Is the 720 compatible or does anybody have a good one for sale?

[Draker]

I'd post a wanted ad in the classifieds. Someone will definitely have a tank for you. Shipping could suck... but maybe not horrible.

[sebpv]

the cheap fix is JB weld.

[datzenmike]

'78 and '79 are compatible and bolt to the frame. Earlier ones were much different and bolted to the bottom of the box. The very early 720 are larger volume with the 4x4 even larger with a notch so it can fit under a KC. Maybe... m-a-y-b-e, you could make a 2wd 720 tank fit.

[flabbychucs]

Are all 620 year tanks compatible? I found a 73...but would that fit my 78KC?

[sebpv]

a '73 is a std cab, the fuel tank is smaller than the KC or long bed

[datzenmike]

'78 and '79 are compatible and bolt to the frame. Earlier ones were much different and bolted to the bottom of the box.

 

KC and short wheelbase the same volume. '78 1/2 on up Long beds are longer and have 13 rather than 12 gallons (US)

 

The '73 is the smallest volume at 11 gal. '74 and up are 12 gal.

[datsunaholic]

 

Are all 620 year tanks compatible? I found a 73...but would that fit my 78KC?

 

 

No.   As stated above 73-77 tanks are different from 78-79 tanks, as they mount in an entirely different manner.  Early bolts to the bed.  Late bolts to the frame.  You could always weld in new brackets, but best to find the right tank.

[flabbychucs]

Right. Thanks for clarifying all that. I understand what you're saying now. I'll create a want ad.

[datzenmike]

You can remove the tank and apply a two part epoxy liner material. It comes in a kit and includes a cleaner/etcher and enough liquid 'mix' to thoroughly coat the insides of your tank and seal it. Instructions included.

 

 

 

Just an example...

http://www.caswellplating.com/epoxy-gas-tank-sealer.html

 

 

 

[PHILDATSUN620]

Hello do you know the measurement of your tank and gallons of your tank I can get you a new one with shipping for $139.49 I just installed a new one in my '79 620 pickup tank was # 1 quality my tank was a 12 gallon the replace tank was 13 gallon it fit like a glove  I hope this help it feels good to top of the tank again.

[flabbychucs]

I think lining the tank is out of the question. Not only is mine rusty but it looks like it's had years of abuse rock climbing with all the dents in it. I suspect the hole is where several creases from dents meet. If it was in better condition I would consider relining but it has so many other problems.

[PHILDATSUN620]

Hello did anyone read my post

[sebpv]

show us a link and picture perhaps?

[qwik510]

I have a clean late style gas tank. I'm in Maryland near Washington, DC.

 

Hit me up at 301-651-7788

I can send you pics.

David

[qwik510]

Hello do you know the measurement of your tank and gallons of your tank I can get you a new one with shipping for $139.49 I just installed a new one in my '79 620 pickup tank was # 1 quality my tank was a 12 gallon the replace tank was 13 gallon it fit like a glove  I hope this help it feels good to top of the tank again.

So this is an aftermarket tank?

[distributorguy]

Since new replacement tanks don't seem to exist, there is a company called Gas Tank Re-Nu, and its a chain.  They repair perforated, rusty dented tanks when there are no other options.  I have sent them tanks that are far more rare than a 620.  They blast, coat, solder, weld, repair anything that needs repair.  Our local shop charges around $200.  I have no affiliation.

http://www.gastankrenu.com/loc-dealer.htm

[orangie]

Hello do you know the measurement of your tank and gallons of your tank I can get you a new one with shipping for $139.49 I just installed a new one in my '79 620 pickup tank was # 1 quality my tank was a 12 gallon the replace tank was 13 gallon it fit like a glove  I hope this help it feels good to top of the tank again.

Do you have a link or website for this?

[Cardinal Grammeter]

If you can find the leak, soldering works well.  You just need to clean it carefully and then use a high wattage big, heavy soldering iron - it will have a big piece of copper in it.  These irons can be 200 watts-ish.  It is amazing how effortlessly a big iron will lay down solder on steel.

 

If the leak is in a seam, then the sealers work very well.

 

I cannot speak from experience with regard to the new alcohol proof sealants, but there appear to be issues similar to POR15 on non-rusty metal:  it doesn't stick well.  I think this is characteristic of the polyeurethane sealants.  Epoxy is probably better.

 

If I was going to use a new sealer, assuming the tank has no baffles, I would strap to a cement mixer and tumble with pea gravel to scratch up the inside for a good bond.  (Yes, I've done this before!)

 

You don't have to worry about getting the last bit of dirt/dust out because the sealer encapsulates it.  (The dirt actually allows a thicker sealer film which is not a bad thing in my opinion.)

[Zephyr620]

Hey guys, noobie over here with a 73 620.  I saw that the 74 620 gas tank is bigger than the 73. but since they both hook up straight to the bed, would  a 74 tank fit on a 73? Can't find a 73 tank but have a pretty good deal on a 74 :/

[datzenmike]

The '73 tank is 45 liters, 11.88 US gallons...... and was the same size through 11/'77 or about half way through the '78 model year production when it was increased to 50 Liters 13.2 US gal for King Cab and short wheelbase reg cab, and 64 liters 16.9 US gal for the long bed. Both these tanks were bolted to the frame and the long bed wouldn't fit anyway.

 

The 74 should be the same size as the '73 but may have small differences for emissions or a return line but should fit..

[MIKEYFTW]

I always thought my 78 had a 12 gallon, but i always tripped out when i could more than 12 gallons when i was empty so it must be a 13 gallon. LOL... I would love a bigger gas tank that held 20 gallons tho. 

[datzenmike]

On my modified '78 I fit an 720 long bed 4x4 tank that was  45 75 liters...  19.8 US gal.

[sebpv]

something you said is wrong: 45 Liters being 11 AND 19 gallons...?

[datzenmike]

Yeah it was 75 liters and 19.8 (US) gallons. (keep getting the imperial gallon mixed up)

 

My '78 had an '82 long bed frame and a 4" body lift with about 16" of total lift so there was lots of room to lower the gas tank mounts on the frame slightly. Enough to slip the 4x4 long bed gas tank forward and under the cab.  I used it to drive across Canada and at 22MPG I could easily get 300+ miles out of a tank.