Ok ..... heres what I have:

87 GM Crew Cab dually
454 TBI (tbi has issues)
Electric in tank factory fuel pump

What I want or am going to do:

replace COMPLETE TBI injection unit with:

Carb
Intake
MSD
HEI
Mechanical fuel pump (like the old days!!)

I want to know if anyone has done this without removing the electric pump in the tank.

Will the mechanical pump draw fuel trough the de-energized electric pump (I'll pull the fuse) and what can I expect from what I'm doing.

PLEASE don't ask me why I don't want the tbi ..... I'll sell the complete unit to you if your interested.

Thanks.

Ratty 46