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Yeah, I know this is a years-old thread, but for those in the future looking for a similar solution... how about going with a fuel pump that uses no electricity at all? One powered off the pulsating suction in the intake manifold? Or powered from the pressure pulse of "blowdown" (that high pressure pulse right as the exhaust valve opens)?
It's a simple matter of two diaphragms connected via a linkage, large diaphragm on the intake (or exhaust, whichever you're using) side, small diaphragm on the fuel side, size the diaphragms accordingly to get the pressure and flow you need.
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