Both of my MB lights go on when starting the car. However, only one seems to function with low fuel. I did the same by putting a couple of gallons in trunk and trying to run it out. A stupid thing to try I know but with the hand pump, I thought I'd be ok. After driving forever, I too gave up and just fill er up. At least we know that the thing will run forever on the last few gallons.

Don

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed