It does the same thing whether I run it from the diesel tank or the WVO tank. I put a prefilter in front of the lift pump and it stays full, and there is good return from the ...um.. return line. So Idon't think fuel supply is the problem.

I've been reading about guys using naptha or turpentine to do a diesel purge - clean the ip and injectors and combustion chamber. I think I'll try that....

I'm thinking maybe the WVO has gunked stuff up.

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles