I came across this interesting section on the Aeroinjector (ex-Aerocarb) page (illustrations there as well):
We've talked about the pros and cons of the injector carbs before, but I am curious about the pros and cons of these fuel systems.
I think that the VP-2 fuel tank is too low for reliable gravity feed, so that leaves the VW mechanical pump, an electric pump, or both, in option 2 or 3 above.
VW gurus, what are your lessons learned and recommendations?
Most Fuel Systems can work with the AeroInjector’s “no float” design:
1) Gravity Feed: A gravity feed system is by far the safest and most reliable. The AeroCarb/AeroInjector requires very little head pressure to operate effectively.
2) Fuel Pump System: If your aircraft requires a fuel pump (ie: wing tanks or pusher engines) a fuel pressure regulator must be installed to limit fuel pressure to about 1 or 2 lbs.
3) Return System: A fuel line “T” is installed between the pump [text says regulator but I think that's a typo] and the injector with a return line to the tank. This will supply the injector fuel without excessive pressure. Excess fuel will return to the tank.
4) Header Tank: Pumping fuel from the main tank(s) to a small header tank mounted above the injector will provide gravity feed to the injector. A return line from the header to the main tank(s) is required. This type of system assures some reserve fuel in the event the fuel pump fails and eliminates the need for a fuel regulator.
We've talked about the pros and cons of the injector carbs before, but I am curious about the pros and cons of these fuel systems.
I think that the VP-2 fuel tank is too low for reliable gravity feed, so that leaves the VW mechanical pump, an electric pump, or both, in option 2 or 3 above.
VW gurus, what are your lessons learned and recommendations?
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