Diesel fuel can be gravity fed directly into your OEM gas tank with an Auxiliary Fuel Line connection kit.
DEE ZEE DZ97962 Auxiliary Transfer Tank Connector Kit : Automotive
Dee Zee DZ 97962 Dee Zee Auxiliary Fuel Line Connection Kits
Dee Zee® DZ97960 - Auxiliary Fuel Line Connection Kit
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Murdoch's – Dee Zee - Auxiliary Fuel Line Connection Kit
Specialty Series Auxiliary Transfer Tank, #DEEDZ91752X
Build Your Own Auxiliary Fuel Tanks - Glasair Aircraft Owners
Auxiliary Fuel Tank for Ford F-250, Dodge Ram & Other Trucks, ford adapter tank
Agile 20-Gal Auxiliary Sprinter Fuel Tank, extra fuel
Dee Zee DZ91742X Tanks - Combo Auxiliary Brite-Tread Aluminum
Dee Zee 43 Gallon Black Aluminum Combo Auxiliary Transfer Tank L54xH18xW16
Build Your Own Auxiliary Fuel Tanks - Glasair Aircraft Owners
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Auxiliary Fuel Tank for Ford F-250, Dodge Ram & Other Trucks, ford