Hi Torgunfu, Welcome to the site!
I worked for a shop that had a Ford with a propane conversion. I am unsure as to a propane install on a fuel injected vehicle. The propane feeds into the top of the carb. Ours was a dual fuel unit, gasoline, or propane. Tank was in the bed, and it is not small.
"Who New? Blue"
1990 Chevy G30 454
Church Van, maternity division
1988 Dodge B250
'94 Dodge B350 www.xplorermotorhome.com/
Xplorer MH model 230 230 hp MPI 360 LA Wedgy OD auto
Old vans never really die if we chose to let them live