Yvon Cournoyer wrote:

Until now I have operated my 1986 - 13B with a single fuel pump on the
Holley fuel injection system. I now wish to install a second fuel pump,
essentially for more security. Holley FIS is a low pressure system (I
operate at 13-14 psi) with excess fuel return to a single fuel tank in
fuselage. In spite of the abundance of info on these lists, I still do not
know which is more practical; an installation in series or one in 
I asked Holley, but they are/were no help. I should have asked here first.
HELP! Please.
Yvon Cournoyer

Parallel Yvon with a switch so you can select either one.
 
Paul Lamar

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