If the veg oil isnt getting up to proper temperatures before being injected, it could have easily damaged the lift pump, ip etc in one weeks time.

It could be the lift pump. I was having issues where my car would stall about 4-5 minutes after starting, and also it would woosh out (or in, I never determined) a big blast of pressure when I opened the fuel cap.

I replaced the lift pump at the same time as the plastic lines, and no more problems related to air in the lines or pressurizing (vacuuming?) the fuel tank.

Rgds,
Chris W.
'95 E300D 204K

Well it turned out to be the aftermarket heat exchanger I was running. I installed clear fuel lines even behind the original fuel heater. I was seeing air bubbles starting just after the aftermarket heat exchanger. I bypassed it and the car runs normal.

__________________
-disav

99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete
98 E300 TURBODIESEL Alexandrite Green on black leather 289K
95 E300 DIESEL Green Queen 267K SOLD
84 300D 216k SOLD
87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD
76 300D 214K SOLD