Fuel pump, fuel lines

Posted on by Neal

Tonight I reinstalled the NPT fittings into the wing tank using Loctite 565. I also reinstalled the fuel filter and pump, securing the NPT threaded fitting with Loctite 565. I completed the torquing of the flexible fuel line at the pump end, leaving the firewall fitting end finger tight. Once I have installed the elbow fitting onto the firewall, I’ll torque that end. I torqued the nuts on the outboard elbow fittings, setting those to 120 inch pounds, after finding that value on VAF. Then I installed the fuel line between the selector valve and the pump, and final torquing those fittings.

I also final torqued the bolts on the aileron torque tubes in the wing root area.

Loctite 565
Loctite 565 on the fuel tank plug
Loctite 565 on the fuel strainer
Torqued the flared fitting between fuel pump and firewall
Final torqued this nut to 120 inch pounds, on both sides of the fuselage
Torque tube bolts torqued and torque sealed
Fuel pump installed, along with the fuel line connecting to the selector valve

Fuel lines

Posted on by Neal

Tonight I secured the fuel lines between the wing root and fuel selector valve.

I installed and torqued the bolts holding the plastic fuel line clips.

The bolts have a Philips head, which made torquing the bolts a little difficult

I also made a realization that I have used the wrong product on the NPT fittings; fuel filter, fuel strainers, and fuel tank drains and plugs. To address the issues, I removed all the fittings and cleaned all the threads with acetone to remove the fuel lube I had mistakenly used. I have ordered some Loctite 565 which I will use in it’s place.

Fuel selector value

Posted on by Neal

Tonight I installed the fuel selector valve.

The valve outlets need to be oriented correctly, then screwed down using Loctite 648, according to Andair’s directions.

With that done, I installed the value into the cockpit, and then torqued up the flared fittings on the aft end of the valve.

Installing screws, and securing with Loctite 648
The value screwed into position, finger tight attached to the tanks lines
The crows foot configuration I had to use to torque the flared fittings.
Because of the difficult access, I followed “Alternate tightening method 2”, and marked the flats against the tubes, then rotated each a quarter turn to fully tighten.