>>cut out as much battery drain as possible.  I'm thinking
>>that I may be able to raise the fuel tank high enough
>>to get the pressure I need.  Assuming the fuel has the
>>same weight as water, how high would it have to be?
>>And for that matter would there have to be a minimum
>>amount of fuel in the tank at all times?
>
>Figure 7/8 the weight of water, so it will need to by 8/7 as high.  33 feet
>of seawater gives one atmosphere or ~15 psi, so 3 psi would be six feet of
>water, or just under seven feet of diesel.

Close.
The weight of jet fuel (assuming this is the heater being discussed) is
about 6.7 lbs/gal at standard temp. so you'd best jack that tank up a bit
higher!

Angus

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Angus Gordon                       '89 Carat
NW Ohio                            '86 Syncro