Yeah, you can test the primary rail, but you have to have the secondary rail too, as it has the FPR on it. You can hold the injectors in with duct tape if you like, I prefer rubber bands. As an alternative, if you have extra fuel line, leave the fuel rail in the upper intake manifold and simply attach long line to test it.
I really like that fact that I can test my fuel system before installing the upper intake on my 4-port.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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