Hello Folks: I have been correcting some dash heater problems and I have found a rubber vacuum line that is not connected to anything. I have traced it to a copper 1/4" line that runs from the dash to the intake manifold downstream of the turbo (CAT diesel 3208T). It looks to me like this could only be a line to power a dash boost gauge, but nothing in the books identifies it and I cannot find any tube that it would connect to. Anyone have an idea of what this is?
Thanks
Tom
93 Regency 32'
Cat 300hp
Allison 4 speed

Yep- the rubber line is open! Just lying there like a snake! Since we be an "ingineer" and we know about pressure losses in pipes, it would appear any attempt to get an accurate boost pressure would be futile- you lose psi per foot of pipe to the point where you would be lucky to read one pound when the engine connection really has 6 to 10 psi. I will check, but if anyone has an idea of doing this it is better to install a sender in the mainfold and use an electric gauge.
Thanks for the tip,
Tom

If the tube goes to a guage, it is dead ended and there will be no flow per se, in that case there will b no pressure loss, what is at the beginning of the tube will be at the end of the tube.

Example: if you have a LONG garden hose, and connect it to a pressure source and put a guage at the output end, with it closed, you will read the same pressure at both ends. If the output end is opened, then the pressure will drop at the output end because of the resistance in the length of the hose. All this is assuming you are not pushing water up hill!

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