British/Swedish/Japanese carbureted fuel systems with electric pumps?

Run, don't walk away from British pumps...Bosch are better, but I've still had failures. Very dirt sensitive. I'd get an aftermarket pump (Carter makes a good solenoid pump) because wrecker pumps have been sitting in dirt and old fuel, etc. This is one area where it pays to go new, or at least clean it out totally and bring spares! Also, low supply current can kill an electric pump....use a heavy feed and ground it well.

Not that I know of, at least not reliably...the problem is that it's been so long since carbs that anything you find in the yard will have sat for a very long time. Most FI pumps are in-tank, but if you could find an external one with an external regulator, maybe, but you'd be blowing off most of the pressure back to the tank. Safety-wise I don't like return lines....I once filled the trunk of my Street Stock during a race when my return line blew and didn't know it.....I blew a thin stream of fuel all over the track until I took the black flag. They wouldn't let me drive it back to my pit....had to push it in. Never again! I'd try E-bay for a "universal" low pressure pump. You don't need much pressure, but volume might be a consideration if you're doing a big V-12, aircraft radial, etc.

Look around on carbed trucks, people put aftermarket pumps on them a lot and I've gotten a really nice Facet high-flow with an internal filter off a Merc 300SD.

EFI pumps don't really scale down particularly well in pressure.

First gen RX-7s have low-pressure Facet pumps, but they're intermittently crappy and barely big enough to feed a 12A rotary.

Personally, I like the Carter pumps. I put one on my RX-7 when I put my half-bridgeport motor in. Somebody lost a chunk of firewood on I-40 and I hit it directly with my Carter fuel pump - hard enough to turn the pump 90 degrees, rip the fuel lines loose, and tear a hole in my rear floorboard. The dented SOB still runs just fine.

If you're gonna run an SU pump at least put in the transistor switch modification....The intermittents and screwdriver rapping drove me nuts on my street Triumph....the Carter ticks just like the SU and works more reliably, so far at least!

SU's, unless you have the spendy model are good for things putting out ~100hp for almost ever. The spendy model is a double-acting pump and is theoretically good for the aluminum 215 V8.

SU's die of two things:
1. gummy neglected old fuel - as in you never drive the beastie 'cause the other Lucas driven systems have given up their smoke...
2. Cracked nipples. these come in 3 flavors; a. mechanically over stimulated b. UV burnt from laying out in the sun too long c. old age.
3. points failure, which starts as a needing a whack to start (said whack possibly causing #2a above) and then developing into an all out refusal to run.

If you never get #1 you've probably got a good pump.
#2 is a quick and inexpensive repair, if Moss has the parts
#3 can be very labor excessive if you don't catch it at a simple points file, and then will degenerate into #2 and #3.
...if you get to #1 from #3, you'll burn out the coil and then it's toast.

(but I now run an Airtex inline 4psi pump, it has real pipe fittings on the end that can be made to go to cruch-unions and such. no more rubber hoses below the tank level to crack break and leak)