I switched over to an electric fuel pump for my Weber 38 DGAS carb. I'm using a Carter P4070. I also thought about a way to stop the fuel pump in case the engine stalled. I replaced the Oil switch with a Holley part # 12-810. It's a 3 terminal switch . I feed a ground wire to the common terminal. The normally open terminal goes to a relay that serves the fuel pump. The normally closed terminal feed the oil light. When I start the engine, the fuel pump starts once the oil light goes out. The fuel pump stops once the engine looses oil pressure. This pump may be too much for SU's but it's great for any Weber.

Changing to an electric fuel pump is usually not a good deal.
Most of the problems you can have with mechanical pumps you can also have with electric ones, plus the problem of too much fuel and too high a pressure.
Further, the electric pump will continue running when the engine stops which may be a
GREAT safety/fire hazard in case of an accident.
Mechanical fuel pumps fail for a variety of reasons and non-OEM pumps are often
problematic. I only use Volvo or Pierburg (Volvo's OEM manufacturer) and generally
have very good success with them. But they have to be installed correctly also.
You probably need a new spacer and two gaskets, one on each side of the spacer.
Also you need to put the pump on with the bolts tight enough but not too tight.
If you tighten them too much you warp or crack the spacer and also warp the ears where
the bolts fit.
NOT having the spacer will put the fuel pump too close to the cam so its stroke is too long.
This can give you too high a fuel pressure and cause flooding, and also can cause premature
pump failure.
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George Downs, Bartlesville, Heart of the USA!