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  1. perrobravo

    1HD-T experts needed! - now with Amazon rewards!!

    Not sure this will help since @Loober and others have already said vacuum should build up very quickly, but here's a quick video showing how fast my 1990 HDJ81 builds vacuum. Vacuum line, in this case attached to output of the pump. Note also, I haven't started this truck in over a week and...
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