Best spot to mount Auxiliary fuel pump KF7

[PNWJARED]

I have a KF7 and am going to install an auxiliary facet fuel pump in line. I know there is plenty of discussion as to add this in series, to add or not to add. I have concluded That i like the redundency and will install it in line. Likely Engine side of the firewall. Though i did want to pull from the vast experience this group has to offer. Mount to the firewall using 90 degree fittings, no fitting before the airbox after the airbox etc...

I am now open to suggestions!

thank you,

Jared

[mr bill]

I did mine in the cabin.

[Dick B in KY]

I placed mine under the center console on my SS7, between the fuel shut off and firewall. Easy to inspect when side panels are off during condition inspection.

Dick B

[PNWJARED]

I see under the seat in parallel. I think the auxiliary fuel pump has a pretty long useful life. So no real need for replacement thus fuel in the cockpit at that time.

I have to change my header tank to the aluminum variety so I will already be working on fuel lines anyway. Good suggestion.

Out of curiosity what is that capacitor for??

[jiott]

Any liquid pump always pushes much better than it sucks, so that would favor mounting it closer to the header tank rather than way forward on the engine side of the firewall.

[Dave S]

Jim Ott is right on - the reason fuel pumps of this type are best mounted in the lowest possible part of the fuel system.

Another point to consider - don't know if this has changed in the current instructions; however, the installation instructions for the fuel pump previously included a statement that the pump should not be exposed to temperatures greater than 140 degrees F.

Sincerely,

[mr bill]

Capacitor eliminates electrical system noise generated by the brushes in the motor. You see the same thing on the alternator.

[PNWJARED]

when we put the fuel pump behind the seat it pressurizes the fuel line from that point on. Pressurized fuel in the cabin? I suspect it is all pros and cons at that point.

[Av8r3400]

Pressurized fuel in the cabin concerned me also.

I plumbed all lines downstream from the auxiliary electric pump with hard aluminum lines for this reason. I only used two short pieces of hose from the tanks to the shut off valves and the header vent line are the only rubber fuel lines in the cabin on my plane.

[n85ae]

That's enough capacitor to function as a backup starter battery ... Probably
the pump runs for 10 minutes after you kick the switch off

Jeff

Capacitor eliminates electrical system noise generated by the brushes in the motor. You see the same thing on the alternator.