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The US climate apparently isn't that conducive to Volvo spawning, although I think they successfully bred them in Canada for a while. but if you are lucky, maybe we had a cold enough winter for a clutch of eggs to hatch. Look around and see if you see any larval stage Volvo's like these on your property:
Back on the post - my advice is to not go to carbs. There's a reason every manyufacturer in the world has gone to fuel injection, and carbs have gone the way of the horse whip (i.e. still a few made for specialty applications). It's because fuel injection is better in nearly every conceivable way. Save, perhaps, for being able to poke at it with a screwdriver.
Granted, D-Jet is a bit crude. It's not really electronic, at least not in the modern digital sense. It's just a pile of analog resistors, tiny relays, whats-its inside a cakepan box. But it does work GREAT on a stock or close to stock motor. Far better than carbs do. It just takes a different skill set to trouble shoot it. D-Jet's main problem (IMO) through the years has been that it was often tinkered with by mechanics, who tried to treat it as a mechanical system. Well, other than the fuel pump and FPR, it's all just electrical. Sensors that work porperly or don't, wires that work properly or don't, and a gee-whiz pile of electronics that works properly or doesn't. When one of those things went awry, the common reaction was to start messing with things to compensate.
So jut do simple electrical style trouble shooting. Look up the ohm readings for each sensor. get a multimeter and test them at the sensor. Then test them again at the computer multiplug (to check the wiring). That will catch probably 90% of the maladies D-Jet gets (wiring and sensors). The computer boxes themselves rarely have issues. The fuel pumps are a bit spendy, but really, there's nothing special about it, with a tiny bit of work you could easily adapt any more modern, cheap common FI style pump.
And if that $350 (or more? who knows?) MAP sensor dies, think long and hard about keeping the rest of the FI hardware and upgrading the ECu from a cake-pan/Radioshack project to something modern and programmable, like Megasquirt. You could probably get MS up and running for about as much as a new MAP sensor would cost.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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