Check the specs for current rating on your switches and then for the pumps. I believe you will find that relays are not necessary.
Don
An AFP fuel pump is rated for 5A, with a 10A breaker (for surge). A regular toggle switch rated for 15A should be fine, if it is well made.
I have experience many switch failures (Carling Switch) due to poor construction of the riveted terminals. I would suggest using a higher quality supplier.
In my HR-II I eliminated most switches that carried more than a couple of amps of current and used relays to switch the loads. The one switch failure I had in the Rocket was (the only) Carling switch I used for a master switch (progressive transfer). It's being replaced with a $35 Honeywell switch.
Switches carrying moderate to high currents that are subject to vibration may develop loose terminals and subsequent corrosion. These terminals are riveted in place with the Carlings using hollow rivets. Honeywell uses solid rivets which are more secure.
The worst loads are Landing lights, gas-discharge Strobe power supplies and motors (pumps). All three of these loads increase their current as voltage drops, which stresses the switches and contacts.
Look at automobiles.. there are almost no switches carrying load current anymore. They directly control relays (electronic or electromechanical) using relatively low currents. Saves weight in switches and wiring and increases reliability. Of course, many loads are now controlled by a computer... like the Vertical Power systems have done.
So, I like using relays to control most loads. Adds a bit of complexity, but pays off in reliability.