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My C6 modulator has dual lines going to it, it has pink numbers on it but, no colored line. I have a fluid leak at the module so I’m going to replace it. What’s the purpose of a dual line one? Do I need a dual one? It’s on a ‘75 F100 with a 390. Thanks
Some old but good FTE info. "Check the vacuum modulator and the line that goes to it. Check the line for kinks or other problems, make sure it hasn't come off. If the line checks out, take the line off where it connects to the modulator. If trans fluid leaks out, its bad. If no fluid, it still could be bad. They're simple to replace, disconnect the vacuum line, remove one bolt that holds the clamp in place and the modulator comes out. It has an o-ring seal.Modulators are identified by the color of the stripe. Pretty much the "go to" one is the black stripe. If they don't show that one in the catalog, go with the green stripe. Avoid the pink stripe. That one is a dual diaphragm version that has two vacuum line going to it. If by chance you have one of these, replace it with one of the other two and use the vacuum line that goes to direct manifold vacuum, cap the other line. When you pull the modulator out, be careful. There is a pin that goes in the modulator. Sometimes it comes out with the modulator, sometimes it stays in the tranny. If it comes out, don't lose it."
The dual diaphragm vacuum modulator was an emissions related piece. The second line was tied into the EGR valve circuit.
You can get rid of it and use the standard single line unit. Cap the secondary line and use the line that goes directly to manifold vacuum.
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