Well, it depends on how the pressure is used. If you have a close fitting hose going through the cap down to the bottom of the tank, air pressure would be used to 'drive' the fuel up into the hose and out. If done correctly, it would not be a bomb, it would only take a few psi to fuel a vehicle this way. Plastic tanks could only take a few psi anyway.
Now, a drawback to this method is it is far harder to stop the flow exactly. That makes the method a bit of a safety hazard because overfills would be common.
Again, very old school tractor method is to create a fueling cradle that lifts a drum or tank up higher than the highest fueling port on your farm vehicles and a simple high quality ball valve set to control flow and vent and you have a gravity fed system. You take the tank down with your loader or have it filled by a farm service (large tanks). With proper precautions and fuel spill protection, this is a very simple and effective system. (Not to mention inexpensive when home built)
http://www.luckeyoilequipment.com/wp-content/gallery/agricultural-residential/elevfarmstorage.jpg
Now, a drawback to this method is it is far harder to stop the flow exactly. That makes the method a bit of a safety hazard because overfills would be common.
Again, very old school tractor method is to create a fueling cradle that lifts a drum or tank up higher than the highest fueling port on your farm vehicles and a simple high quality ball valve set to control flow and vent and you have a gravity fed system. You take the tank down with your loader or have it filled by a farm service (large tanks). With proper precautions and fuel spill protection, this is a very simple and effective system. (Not to mention inexpensive when home built)
http://www.luckeyoilequipment.com/wp-content/gallery/agricultural-residential/elevfarmstorage.jpg
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