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Ceengland
Joined: 11 Oct 2020
Posts: 379
Location: MS
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 Posted: Tue Aug 02, 2022 12:55 pm Post subject: Kolb-List Digest: 1 Msgs - 07/30/22Kolb-List Digest: 1 Msgs |
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On 8/2/2022 2:10 PM, Richard Pike wrote:
| Quote: |
One thing I would do different would be to use a high grade automotive rubber fuel line for the flex line that is inside the tank to the pickup.
Back when I first built my MKIII, I modded the fuel tank area so I could use two 6 gallon boat tanks, and used the best available green plastic tubing down to the pickup.
When I built a 15 gallon tank for the center section, I ended up using the two boat tanks to go to the gas station and get/store fuel.
Last spring I noticed that one of the original plastic lines had broken off and was laying in the bottom of the tank. Granted, that original fuel line install was a long time ago, but still - ya can't beat real fuel line.
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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Even high grade fuel line will degrade, if it isn't rated for in-tank
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use. The liner is fuel proof, but the jacket isn't. I discovered that
about 4 years ago, less than a year after restoring a Twinstar. I
initially set up a 'flop tube' using the common grommet style fuel
fitting with a short metal tube brazed into the inside end, and the
common blue urethane hose connecting the fitting to a weighted screened
pickup. Less than a year after assembling it, the blue urethane tubing
rotted away at the tank fitting (image attached). When I looked for
regular fuel hose, I discovered that 'in-tank' (submersible) rated hose
sold for way over a dollar *per inch*.
Here's an example from Summit (lots of other examples available):
https://www.summitracing.com/parts/hly-26-161
That's when I converted the tank to bottom exit....
Charlie
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Charlie |
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neilsenrm(at)gmail.com
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| Posted: Tue Aug 02, 2022 1:59 pm Post subject: Kolb-List Digest: 1 Msgs - 07/30/22Kolb-List Digest: 1 Msgs |
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I also used what I thought was a good ultralight fuel line. After a few years it got hard and some of it broke. I switched to a good black automotive fuel line (labeled as fuel line on the hose) and never have had any more issues.
Also I have a MKIIIC with flaps. Noticed the flaps were binding a bit so I started looking behind the sound barrier behind my head and found that the cotter pin on one of the castle nuts on one of the bolts holding the flap linkage together was missing and the nut was almost off the bolt. The nut and bolt pass between two tubes that don't have much clearance. I know there was a cotter pin in there when I built it more than 25 years ago. I think over the years the nut must have rubbed against one of the tubes and broken the cotter pin and pushed the cotter pin out of the nut. Maybe the sound barrier material snagged the cotter pin.
Check your plane over better than I did!
Rick Neilsen
Redrive VW Powered MKIIIC
On Tue, Aug 2, 2022 at 3:12 PM Richard Pike <thegreybaron(at)charter.net (thegreybaron(at)charter.net)> wrote:
| Quote: | --> Kolb-List message posted by: "Richard Pike" <thegreybaron(at)charter.net (thegreybaron(at)charter.net)>
One thing I would do different would be to use a high grade automotive rubber fuel line for the flex line that is inside the tank to the pickup.
Back when I first built my MKIII, I modded the fuel tank area so I could use two 6 gallon boat tanks, and used the best available green plastic tubing down to the pickup.
When I built a 15 gallon tank for the center section, I ended up using the two boat tanks to go to the gas station and get/store fuel.
Last spring I noticed that one of the original plastic lines had broken off and was laying in the bottom of the tank. Granted, that original fuel line install was a long time ago, but still - ya can't beat real fuel line.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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