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My RV-4's is similar to Charlie's, except I have a dedicated line into the right tank for fuel transfer. I did not want to have the low pressure Facet transfer pump fight the fuel regulator return stream.
So:
Fuel transfer from left to right tank.
Fuel pickup in right tank -> coarse filter -> Y'd two EFI pumps Y'd -> fuel regulator (return from fuel regulator directly back into right tank) -> firewall -> EFI fuel filter -> Y'd primary and secondary fuel rails. Fuel pressure sender on end of secondary fuel rail. (Output from pressure sender electronically filtered to filter out spikes from injectors opening and closing).
The transfer line goes into the second bay in the right tank (maybe more, I forget).
The return line from regulator goes all the way out into the outermost bay in the right tank.
All lines are 3/8" except 1/4" vent line.
If you want I can post or send pictures.
Finn
On 2/21/2025 11:14 AM, Le Roux Breytenbach breytenbachleroux@gmail.com wrote:
Hi : Do somebody have a schematic drawing ? Of a typical low wing experimental aircraft fuel system to the 13B.
Can’t find good detail info.
The feed from the wings to the high pressure fuelpumps.
Where to place the low pressure fuel pumps and then to fuel injection pumps.
Must i do a header tank ? or not.Must the high pressure pumps be inside or outside on the firewall?
Regards Le Roux
Sent from my iPhone
Le Roux Breytenbach
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