Why not copy the Piper design with a mechanical (diaphram) and electric in series? Diaphrams do fail, but only from neglect. I'd use a stock VW pump and replace it every other year in an excess of caution. Peter
>All the VW s I've had over the years,> I don't recall ever having one go bad. > I'd like to have a plan b though.> What you all think?One thing to consider >is that when the VW pump does fail due to a diaphragm rupture, fuel is free >to flow into the engine block, and things get ugly immediately after if you >are pushing it with 5 psi! I think that's why you don't see many stock pumps >on aircraft engines. That's why we don't use them on Corvairs, at >least...Mark Langford
