Fuel pressure hookup for dual CP3s

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
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Not to brag or anything, but I came up with a pretty awesome spot to hook up a sending unit for a fuel pressure gauge. Unfortunately, it will only work on a dual CP3 setup (unless you really want to dig down to the stock pump). Here's what I did. I got a male 12 mm x 1.50 to female 1/4" NPT adapter. I removed the incoming fuel fitting for the second CP3. I threaded the adapter in and tightened it down. I then marked the flat that was the most accessible. Next I removed the adapter and drilled and tapped the flat that I marked to a 1/8" NPT (the adapter I bought was plenty long enough that I didn't get anywhere near the 1/4" threads). Now I took a 1/4" NPT to 5/16" barb and threaded it into the adapter and installed the whole thing into the CP3 inlet spot. Tightened it all down and installed my gauge sending unit. Gives the fuel pressure the CP3 sees. Worked well enough for me to find out the second pump in my dual lift pump system seems to be not doing anything. I guess I need to check the wires and make sure I have good connections everywhere. Since I just got it done, I don't have any pics, but I'll get some tomorrow.
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,746
821
113
Texas!!!
This is about the best picture I can get right now. Maybe I can get something better in the daylight.

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JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,746
821
113
Texas!!!
Got the second pump working today. Just as I suspected, one of the crappy Posi-Lock connectors corroded the ground wire, and it was just dangling there unhooked. I used a butt connector to tie all the ground wires together so both pumps will run at the same time whenever the truck is running.