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Old 01-12-2018, 09:06 AM   #1
3x2GTO
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gas tank replacement

I just bought a 1985 K30 with factory dual tanks and they both need replaced, I'm guessing they're the 16 gallon ones. Will 20 gallon tanks fit without mods, if so can I use the same sending units? Thanks!
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Old 01-12-2018, 09:14 AM   #2
sweetk30
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Re: gas tank replacement

k30 is long bed only factory so 20 gal is factory . tanks are same left/right so no need to get specific left/right . sending units tho are left AND right . senders are also same for tank size . just the side of truck as i said .

spectra premium is o.e.m brand and basically best aftermarket quality . rockauto / autozone / other parts places all have them .
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Old 01-13-2018, 09:28 AM   #3
3x2GTO
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Re: gas tank replacement

Well, I had that wrong.THANKS for the information.
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Old 01-13-2018, 10:50 AM   #4
100%Chevy
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Re: gas tank replacement

When you buy new tanks,measure the filler hole.
There are at least 2 different sizes.
Make sure the new tanks are the same size as your old tanks.
Mike.
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Old 01-13-2018, 10:20 PM   #5
3x2GTO
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Re: gas tank replacement

looks like spectra GM1b with 1 5/8 filler neck is the only option, I'll measure tomorrow Thanks!
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Old 01-14-2018, 12:24 AM   #6
hatzie
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Re: gas tank replacement

The filler hose diameter is year dependent. Don't remember what the split year is... 1985 is well past the split so your supplier should know.
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And please let us know if and how your repairs were successful.
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Old 01-15-2018, 08:28 PM   #7
3x2GTO
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Re: gas tank replacement

My tanks measured at 1 5/8, the pass is about to come off on it's own! Luckily the seller did throw in new GM braces. I'll post pictures of the new tanks install next month.
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