Fuel catch tray

[bananaman]

I have been working towards a re-cert for some changes in my 73 Toyota corolla and not sure what exact requirements are for the tank mounting as well as the catch tray.

This is the tank installed, it was designed to retain the factory mounting points and location. Factory tank was around 35ltrs approximately new tanks is approximately 60ltrs



This is the tray setup I am considering, where the upper section will go under the tank and have a drain to the exterior of the car via the spare wheel well.
At this stage that tray will have a 20mm lip on the three sides and the curved section with stop ends where it wraps under the tank behind the rear seats.


A separate drain is planned for the box that contains the fuel pump and fuel filter again exiting via the spare wheel well. 

My questions are.

1/ is a 20mm lip sufficient? (not clearly stated in the construction manual)
2/ How is mounting of the tank considered in this situation? Tensile strength of the 4 bolts locating the tank or am I better to create an area to support the tank to the floor with a strap over it to secure it to the floor?

Thanks in advance.

[Chris]

May 7, 2020 15:53:39 GMT 12 bananaman said:

My questions are.

1/ is a 20mm lip sufficient? (not clearly stated in the construction manual)
2/ How is mounting of the tank considered in this situation? Tensile strength of the 4 bolts locating the tank or am I better to create an area to support the tank to the floor with a strap over it to secure it to the floor?

Thanks in advance.

Gidday Bananaman,

You are correct, there is no requirement for a minimum height of a catch tray lip, however any catch tray must be designed in such a way that in the event of a rupture or leak it would not allow fuel to collect and remain in low areas or enter the passenger cabin or drain onto any part of the vehicles electrical or exhaust systems. This is something to discuss with your certifier to determine what they would be happy with.

If the factory mounts are sufficiently strong to hold the extra capacity of the larger fuel tank, then they will do, however if there is any question then it would pay to add some support brackets that supplement the factory system. Straps over the tank with a suitable anchoring structure would be one way to achieve the goal.

Cheers

Chris

[bananaman]

Thanks for the reply Chris.
I think I am on the right track just need to work in a little closer with my local certifier to get it sorted.

Regards,
Brian

[bananaman]

Back on this topic, I have had a stainless steel tray folded up and have been working on fitment.
One question, I have folded the rear section upwards towards the back seat which extends beyond any fittings or welding on the tank itself, would this be considered satisfactory as a spill tray for the main fuel tank?
I am yet to have the drain formed in the tray which is going to exit via the spare wheel well away from the exhaust side of the car.


Thanks for the input.

[Chris]

Sept 1, 2020 9:17:23 GMT 12 bananaman said:

Back on this topic, I have had a stainless steel tray folded up and have been working on fitment.
One question, I have folded the rear section upwards towards the back seat which extends beyond any fittings or welding on the tank itself, would this be considered satisfactory as a spill tray for the main fuel tank?
I am yet to have the drain formed in the tray which is going to exit via the spare wheel well away from the exhaust side of the car.


Thanks for the input.

Apologies Brian, we recently upgraded our email software and I have only just found out that notifications of new posts to the forum have not been coming through. I believe you have had your question answered by Brendon through the tech email.

Cheers

Chris