All M110 with Solex 4A1 Carb fuel pumps are mechanical, they're sealed typed pumps and once they're leaking oil or gas simply throw it away and buy a new pump.Unlike M121, early M115 and M180 engines, their fuel pumps are rebuild-able(changing only the diaphragm,small bronze filter and six screws with the kit).

D-Jet and K-Jet engines are have electrical fuel pump. In the Philippines, they're 2 brands of pumps, PIERBURG and VAICO. Buy only the PIERBURG b/c VAICO pumps are not good, it lasted in my 280S for 6 months!!! some guys here converted their orig. pumps to electrical but rated only 3-5 PSI of pressure otherwise it'll flood your carb.

that Megasquirt idea is good but some $$$ and sweat to make it work but in return, you get excellent fuel mileage,more HP,Torque and drivability. Is there a billet throttle body to fit in a M110's intake manifold? like what we see in most chevy,ford and chrysler engines with multi-port EFI with throttle body fuel systems.