small gas tanks

[Frank S.]

are small gas tank on 63 corvette have hold down straps with a hook at one end nut bolt at the other end or is there any threaded holes in the rear frame

[Edward J.]

Re: small gas tanks

Frank, I just did my 63 chassis and the gas tanks straps are hooked on one end and the other side has a carriage bolt with nuts there are two nuts for each side one on the top the other on the bottom,

The bottom nut is to adjust the tension on the strap, The the other locks the adjustment in place.

[Frank S.]

Re: small gas tanks

so there no thread bolts in the frame from the factory that the small tank strap is bolted to thread into the rear frame

[John H.]

Re: small gas tanks

so there no thread bolts in the frame from the factory that the small tank strap is bolted to thread into the rear frame

Frank -

That's correct - there are no bolts at the rear of the straps where they hook into the frame; only bolts are at the front.

[Frank S.]

Re: small gas tanks

i was told by someone there are factory thread tap hole near the rear frame which show a small tank was install by those threaded tap holes in the rear frame

[John H.]

Re: small gas tanks

i was told by someone there are factory thread tap hole near the rear frame which show a small tank was install by those threaded tap holes in the rear frame

Frank -

Nope - no bolts at the rear, as shown in your Assembly Manual.

[Wayne M.]

Re: small gas tanks

i was told by someone there are factory thread tap hole near the rear frame which show a small tank was install by those threaded tap holes in the rear frame

Frank -- what you might be referring to is (on a 20 gal tank), the last clip nearest the rear where the rubber fuel line attaches to the steel line, there's a hole on the top side of the frame for a retention clip. [Ref. 1965 AIM UPC 8, Sheet B3, view A]. I believe the fuel line clip holes are pre-drilled on all frames.

If you have a small tank car, the hole shown in the above reference will exhibit evidence of a screw having been threaded. If a 36.5 gal tank car, no thread evidence, and there'll be another hole for a fuel line clip at the cross-member inboard of the frame kick-up [Ref UPC N03, Sheet 4, view C]. This one will be threaded.

I'd have to check my car for the UPC 8 hole theory, but it's too cold in the garage .

[John H.]

Re: small gas tanks

Frank -

Here's the fuel line clip and screw on top of the right side rear frame rail Wayne referred to; that clip was used on all 20-gallon tank cars, and the hole for the thread-forming self-tapping screw was pre-pierced in all frames.

[Frank S.]

Re: small gas tanks

when you were saying the screw was pre-pierced in all frames forming self tape hole all frame even z06 big tank car included

[Philip C.]

Re: small gas tanks

when you were saying the screw was pre-pierced in all frames forming self tape hole all frame even z06 big tank car included

Hi Frank the holes were there, but the hole should show no sign of a cut thread that a self tapping bolt/screw would make. Phil 8063

[Wayne M.]

Re: small gas tanks

when you were saying the screw was pre-pierced in all frames forming self tape hole all frame even z06 big tank car included

Another hole on an N03 car that should show no sign of a self-tapping threaded screw ever having been installed (this one is much easier to see): look on the passenger side frame kick-up just a couple of inches above the trailing arm pivot bolt. That's where the spiral-armoured fuel line is attached to the frame with a clip on a 20 gal car. On a tanker, that should be a clean hole.

The hole I'm talking about is the one shown in the thumbnail, from my late '65 20 gallon tank convertible.