Herbert Boks wrote:

Dear fellow rrrrrrrotarians,

I want to ask for your thoughts/comments on the following.

I am building a Cozy MK IV and will install a 3rd gen. 13B. I've spent some
time trying to understand fuel systems for EFI engines, noting that with 2
main tanks, the need for return lines adds a lot of complexity to the
system. I'm thinking about electrically controlled fuel valves on the
firewall (2 valves and 1 solenoid or motor per tank). Since with EFI we
must have electricity to run the engine in the first place, the inability
to switch tanks in case of a power outage is not really an issue. In my
opinion an EFI demands a backup electrical system in any case. I see great
advantages in placing the fuel valves on the firewall:
- shorter fuel lines
- no need for a sump tank
- less fuel heat, because it runs back to the main tanks
- no fuel lines inside the cockpit

There is the added risk of not being able to shut the valves when power
fails due to engine fire. I'm not sure how to address that yet.

My understanding of EFI is rather superficial, so I may be overlooking
things. I may also be overlooking other side effects. What do you think?

Herbert

Building PH-CZY (Ch.10)
Cozy MK IV #0769

herbert@datamax.nl
The Netherlands

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