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well the firewall mounted filter housing in the cucv just sucks to put it nice. They all seam to leak air at the place where all the wires go in to the unit. I replaced mine with a spin on unit from napa. Works really well just you lose the "water in fuel" light.

RE: CUCV Wont accelerate Wont rev in neutral until RPMs cree well sorry to say but a vac leak wont make the cucv run like that. you can drive the trucks with out a intake at all! the only vac source is the pump and thats a stand alone system. I would start to look at the fuel filter and see if...