Usually it's described as about a quarter of a tank, but I wouldn't bet on it. If your tank is down that far, it's better for the system to fill it up. Condensation (water) can't develop if the tank is full. Less chance of clogging fuel filters, water separator, and development of algae. If you fill it up, you'll know how much was left in the tank.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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