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Old 11-18-2012, 07:29 PM   #1
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Diesel drip vacuum gauge relation

I have a 92 Damon dp with 5.9 Cummins. After a long trip in mountains last weekend I noticed a small diesel leak along the frame rail. When I drove it earlier I noticed the dash vacuum gauge was reading 0 . are these related? Is it time for new fuel filter? I also have noticed a loss of power. Any insight into how my fuel system works would be appreciated.
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Old 11-18-2012, 08:43 PM   #2
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Since diesels have no throttle plate to regulate air going to the engine
There generally is no vacuum. What is this gauge for? ? is it a air filter flow (dirt) indacator?? if so "0" is what you want. That would mean it all flow no dirt. Right after i fully top off my fuel tank I can get a drop out of the vent hose. I'd think if i was on a steep incline i might see bit more if the tank was really full.
Turbo or not you will lose power at higher altitudes. A turbo will lesen this effect but it still happens. Did the power feel "normal" once you got back to a lower elavation??
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Old 11-18-2012, 09:10 PM   #3
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Quote:
Originally Posted by Damon92
I have a 92 Damon dp with 5.9 Cummins. After a long trip in mountains last weekend I noticed a small diesel leak along the frame rail. When I drove it earlier I noticed the dash vacuum gauge was reading 0 . are these related? Is it time for new fuel filter? I also have noticed a loss of power. Any insight into how my fuel system works would be appreciated.
Are you sure this is a vacuum gauge? What is the normal reading of this gauge and did it fluctuate?
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Old 11-19-2012, 08:35 PM   #4
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I'm not sure it is a vacuum gauge but it used to read 15-25 and fluctuate with throttle. Perhaps boost? I fixed leak today and still on 0. Thx for input.
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Old 11-19-2012, 08:50 PM   #5
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That makes sense. If your boost gauge is reading zero all of a sudden then you have most likely blown one of the flexible connectors that goes to the charge air cooler. That's also why your power has gone away.
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Old 11-19-2012, 08:55 PM   #6
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Originally Posted by Mekanic View Post
Since diesels have no throttle plate to regulate air going to the engine
There generally is no vacuum. What is this gauge for? ? is it a air filter flow (dirt) indacator?? if so "0" is what you want. That would mean it all flow no dirt. Right after i fully top off my fuel tank I can get a drop out of the vent hose. I'd think if i was on a steep incline i might see bit more if the tank was really full.
Turbo or not you will lose power at higher altitudes. A turbo will lesen this effect but it still happens. Did the power feel "normal" once you got back to a lower elavation??
Cummins says the rating of the engine is good to about 10,000 ft, after that HP/torque will fall off.
Diesels have no vacuum to be read unless it's normally aspirated. If you have a turbo there is no vacuum to read, it's all pressure.
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Old 11-19-2012, 08:57 PM   #7
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I'm not sure it is a vacuum gauge but it used to read 15-25 and fluctuate with throttle. Perhaps boost? I fixed leak today and still on 0. Thx for input.
Yep, that's pounds of boost.
If the tubing is all good and the CAC isn't leaking then the guage is bad, lthe hose to the gauge is bad (if not run off the ECM like ours is) or even the turbo went bad.
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Old 11-19-2012, 09:50 PM   #8
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I will do some looking for loose tubing around turbo. The turbo is good. Why would someone use vacuum gauge for boost?
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