Firewall Part 2 – Gascolator
Continuing with mounting items to firewall. I had to make a decent-sized doubler (160x120mm) to cover all the holes originally provisioned for the 914 fuel pumps. Instead, the gascolator (fuel/water separator) gets mounted at this location near the bottom of the firewall.
![](https://i0.wp.com/sling4.jetshine.net/wp-content/uploads/2022/04/img_3103.jpg?resize=678%2C509&ssl=1)
![](https://i0.wp.com/sling4.jetshine.net/wp-content/uploads/2022/04/img_3102.jpg?resize=678%2C509&ssl=1)
Meanwhile I’ve also started on all the little cutouts for the firewall “heat shield”, which is not much more than a thin layer of foil with foam backing.
![](https://i0.wp.com/sling4.jetshine.net/wp-content/uploads/2022/04/img_3109.jpg?resize=678%2C509&ssl=1)
In other news, Rotax issued yet another service bulletin for their fuel pumps: this new one, SB-915i-012, again blames “deviations in the manufacturing process,” which is the same wording they used in the previous 2019 Alert Service Bulletin ASB-915i-011, so now the pumps have to be replaced again! I got in touch with Lockwood Aviation in Florida, and they are running a replacement program. Once they get parts in stock, I simply need to send the whole fuel pump assembly. They will replace the pumps, perform a leak check, and send the unit back to me within 1-2 days.
I’m also working to finish up the right wing, which is all but complete. I came up with a way to mount the landing light lenses to the wing. Rather than use plastic screws that just bite into the polypropylene sheets included with the kit, I designed a simple nutplate to glue down to the lens. These 3D-printed parts have embedded M3 nuts that I insert mid-way during the print.
![](https://i0.wp.com/sling4.jetshine.net/wp-content/uploads/2022/04/img_3106.jpg?resize=678%2C508&ssl=1)
Everything looked great until I tried attaching the lens to the wing.. and I found that the pre-drilled holes in the lens don’t line up with the holes in the wing skin (grrr). So, I ordered a sheet of 1/32” polycarbonate and will try to make a new lens, but I will make sure to match-drill to the wing skin.
![](https://i0.wp.com/sling4.jetshine.net/wp-content/uploads/2022/04/img_3108.jpg?resize=678%2C509&ssl=1)