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Old 09-27-2008, 05:40 PM
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Hooking up fuel pressure gauge

I know this isn't powerstroke related, but my buddy has an '04 common rail cummins with a cp3 injection pump. He is wanting to hook up an aftermarket, off brand fuel pressure gauge and the both of us don't really know where to start.

These are our ideas for hooking it up:
1) Mount a sensor on one of the banjo bolts going to/from the cp3

2) Find a way to tap into the factory sensor (worried about changing resistance by adding pressure sending unit)

3) Mounting a sensor on the distribution block for the common rail itself.

The way I figure it, someone should be able to point us in the right direction. Thanks for the help!
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Old 09-27-2008, 05:43 PM
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ive heard of people tapping in near the fuel filter , i believe they even make special fuel filter caps pre tapped for fuel pressure units
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Old 09-28-2008, 06:25 AM
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Hey thanks! That gives us a starting point.
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Old 09-28-2008, 06:58 AM
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you can tap anywhere in line before injection pump to get base pressure , if you can find the fittings or make something to tap in with , there is also a fitting that can be bought to tie in right at the injection pump on the feed side , that a fitting will screw right into , and base pressure on a cummins is goin to be 6-10 lbs
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Old 09-28-2008, 01:19 PM
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i think cummins suggest you don't go below 8-9psi or go above like 25-26psi. I know alot of people with cummins and they are mostly running 15-17 psi and with fuel systems they don't drop below 10-12psi at wide open throttle. Don't mean to start anything scuffy just letting you guys know what i have seen
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Old 09-28-2008, 05:29 PM
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cumminsforum.com
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Old 09-28-2008, 05:37 PM
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Quote:
Originally Posted by tonypagnano View Post
i think cummins suggest you don't go below 8-9psi or go above like 25-26psi. I know alot of people with cummins and they are mostly running 15-17 psi and with fuel systems they don't drop below 10-12psi at wide open throttle. Don't mean to start anything scuffy just letting you guys know what i have seen
no problem, i havent personally seen a dodge run that high of pressure on the lift pump side of the fuel system, but not saying it cant
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