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Old 07-17-2019, 04:21 PM   #1
sick472
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85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

It's time to work on my 85 K20 fuel tanks. It has duel 16 gallon tanks and one of them is leaking due to a rusted frame bracket and a hole in the bottom while the drivers side will not supply fuel (maybe an electrical problem as I have already replaced the dash switch and selector valve.

I plan on pulling the bed to trouble shoot the drivers side issues and I might as well convert to 20 gallon tanks while I'm at it.

Will the 20 gallon tanks swap in easy enough? Any tricks you could share?
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Old 07-18-2019, 06:57 PM   #2
86454k30
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

Parts needed that I am aware of.

20 gallon tanks
Fuel fill hose(s)
Fuel fill vent hose(s)
Fuel fill neck(s)
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Old 07-18-2019, 07:03 PM   #3
sweetk30
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

that list seems right . i just did this on one last year . the frame bracket on the rear position just moves to the extra holes in the frame .

with new bracket make sure you weld the nuts on the bracket to help in the install . and there universal left to right so mock it up first to see what holes to mark to weld the nuts on . i didnt watch on one i did but got lucky and swapped sides and got away with it .

i also use tar paper for house roofing jobs as the anti squeak pad between the tank and brackets .
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Old 07-19-2019, 08:16 AM   #4
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

Might plan on new frame brackets and straps. If one is rusted out, good chance the others aren't far behind.

Make sure the fill pipes on the new tanks match the size of your existing fill receptacles. IIRC - the earlier tanks had larger hoses. Possible some PO swapped in earlier parts.

Probably a silly question but it is a long bed?
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Old 07-19-2019, 04:03 PM   #5
old Rusty C10
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

I don't know what your skill and tool availability is but my brackets rotted right at the bottom and we were able to get straps at advance auto parts and then make the patch to fix the old brackets.. they worked well
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Old 07-24-2019, 09:23 AM   #6
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

Thanks a million for your responses...you folks are great! Now, it's time to save some time and money as all the items I will need will be a bit spendy if I go "all the way".

I think I read that the tanks can swap sides??? If that is the case, I might put the driver's side good 16 gallon tank on the passenger side and just buy a 20 gallon tank for the driver's side. I'm tired of filling up so often AND having to walk around the truck to get to the "good" tank (than now seems to have a small leak).
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Old 07-24-2019, 10:18 AM   #7
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

IIRC - the tanks can be swapped. The senders can't.
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Old 07-24-2019, 01:35 PM   #8
sweetk30
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Re: 85 K20 Dual Fuel Tank 16 to 20 gallon conversion?

tank and the brackets are left/right swappable unless the nuts are welded to the brackets then you just work around that .

i got my spectra premium tanks off ebay cheeper than any were i found from the popular stores and web sites .
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