Kirby,

From my limited experience with 120/240v wiring, black indicates the "hot" wire and white is for the neutral (ground) wire. This well might not hold true for the manufacturer of your pump. You could consider testing the pump starting with that info for the connections.

If the pump is not installed yet, I'd do (and some will question my judgment here) a test using paint thinner in lieu of gasoline using a container in which both the feed and exit hoses are placed. The thinner (essentially stoddard solvent) is less of a danger than gasoline, and not likely to damage the pump for a short run. If you go this route, do it away from structures and with an extinguisher handy. The idea is to see which choice of connections produces a higher flow rate.

If installed with the hoses connected, you could disconnect the return line in the engine compartment, after the pressure regulator, and watch the flow into a container. In this case you need to exercise the cautions mentioned above and have a bigger extinguisher. Use your own judgment on this one since you can lose the car if you're not careful about sparks etc. I have done this on two occasions to verify fuel flow. You DO NOT want the engine running when you do this test.

I don't know how the pump is constructed. But if its a centrifugal pump it can work in both directions of rotation, but will work better when its running in the correct direction.

And...you could always try to get information from the manufacturer. My guess this is likely to be frustrating and nonproductive.

Good luck.

Tatra Mike

Seattle, Washington

1985 244 "Alfsen" (wife's car - the good one)
1984 245 "Buster" (the kid's car, now sold)
1985 245 "Cosmo" (parts car, sold off for move to WA)
1985 245 "Daisy" (back seat down, full of tools, the work truck)
1985 245 "Earl (CA vehicle 'retirement' program)

Can you tell I prefer the 1985 model 240? Better headlights than the plastic 1986+ and nicer belt adjustments than the 1984s and earlier!