Hello BRG. As the injectors are on the pressure side of the IP, I can not see how air could be sucked into the fuel lines.......I would put a electric push pump on the supply side............

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1982 Luv Diesel 4X2
1982 Luv Diesel 4X4
1981 Luv diesel 4X2
1983 Isuzu Diesel 4X4
1986 Trooper TD