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Trust me on this one. Save yourself A LOT OF TROUBLE and just use biodiesel in the 6.9? How do I know this? I've run 50k miles on biodiesel without an injector pump problem.
The injector pump is sensitive to fuel viscosity. While the 6.9 can run on boiled horse pee it seems, the pump can break the pump drive shaft due to running too viscous a fuel.
Despite heating the veggie oil, it's still not going to be as thin as diesel or biodiesel.
If the metering valve keeps sticking, ditch the WVO get into biodiesel and run a can of SeaFoam or Powerservice full strength by either dumping the whole can into the fuel tank or taking off the fuel filter and filling it with SeaFoam or Powerservice.
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The Green Monster: 2001 F250 Powerstroke, 2WD, ZF6 transmission. Bully Dog GT Tuner set in tow mode. MotorSilk boric oxide added to engine, transmission and diff. Showing 30mpg on the freeway running home brew biodiesel. NTZ 1/2 Micron bypass oil filter. Dieselsite Coolant filter and Caterpillar ELC next on the list. 4" open turbo back exhaust.
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