First thing to do today was to fit a grommet in the firewall for the aluminium fuel pipe to go through and be supported and stop it chaffing.

The final screws arrived so I can now completed the installation of the water radiator.

The water pump outlet needs to be repositioned to allow it to be piped to the radiator.

Trial fitting of the pipe to make sure the pipe run doesn’t snag any other pipes or brackets.

Re-fitted the water pump outlet and tightened the screws with Loctite 643

Now the grommet has been fitted I can complete the installation of the fuel feed piping to the gascolator.

All the pipes are clamped with a hose clamp and fire sleeving is slid over the whole assembly and secured with aircraft grade stainless steel wire wrap. This ensure the fire sleeving doesn’t move and ensures the fuel pipes are protected in the event of an engine fire.

An example of a completed wire wrap.

The flow from the mechanical pump supplies the carburettors and then a return is taken to the lefthand fuel tank this allows a constant feed of fuel to circulate the fuel system and alleviates the chance of a vapour lock. The return feed is restricted by an insert in one branch of the cross connector (see photo) this ensures the carburettors get sufficient supply of fuel.

The cross connector centrally installed with the return line connection still to be completed.

An view from overhead showing the positions of the pipework to date.

view form the left hand side Before the return line is installed the aluminium return pipe needs to be fitted.

It’s a tight squeeze in the nose wheel tunnel but with perseverance the connection is made and the hose clips tightened. This piece of tubing doesn’t need the fire sleeving because it is behind the firewall.

Return pipe installed.

Once a wire wrap has been carried out the end is cut off as leaves a very, very sharp barb. To ensure that it doesn’t cut into you when carrying out maintenance the end it bent over on itself and pushed down .

The return line now completed.

I completed the piping to the carburettors but having reviewed the run I’ve realised that it’s not the best installation. I will re run the pipes tomorrow so they are a lot shorter and won’t run round the exhaust like they are in this photo.