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Rob 930 Rob 930 is offline
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Join Date: Dec 2002
Location: Seattle
Posts: 661
Stepping back from this for a minute: why do you want to use a gravity return instead of the old tried-and-true cam-driven scavenge pump? That system works so well and doesn't risk getting whacked during unfortunate excursions off the track. I had a gravity return that looks just like yours -- with an AN-8 line to a welded bung on the sump plate -- on my 78 930 with the old 3LDZ and it didn't work well. Mosquitoes didn't like it either. I went back to the scavenge pump for primary function, and an overflow that went to my right side chain cover (a Bob Holcombe idea) for my Garrett turbo. It worked flawlessly. I agree that gravity is simple and free, but if there's a risk, remember that the original system works well.

Old 11-04-2014, 03:47 PM
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