Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 yes, I wish I had a picture of my set-up.. I answer this question every month or so... jojo Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 Ok, thanks. Took the eup harness all the way off anch checked everything. All looks good and ohmed good. Reinstalled and now i have codes for low voltage at every EUP and it will barely start and run horribly. Not sure where I went wrong. I am guessing i somehow spread the connectors kn the harness side. Going to have to figure it out. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 are you saying you probed the eecu ends with something larger than a small paper clip? Most folks dont have back up probe kits, so the smallest paper clip in the office will work.. Do you have the pin I.D. for the eecu connectors? it is printed on the wire also. It will tell you where to go, from one end to the other.. Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 I had the pin out diagram. Used a little tiny Allen wrench but had to push it past the plastic just a little bit. Guessing maybe i spread the connectors a little. Has to be that. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 Yeah, probably... with a sewing needle, you can tighten them up.. this is a picture 8-9 code, from my V-Mac book.. Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 Sewing needle, that’s a great idea. All my picked were just a little to big. 1 Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted January 31, 2023 Share Posted January 31, 2023 1 hour ago, Joey Mack said: yes, I wish I had a picture of my set-up.. I answer this question every month or so... jojo Found the picture Joey. 1 1 Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 That looks like it’s right after the fuel pump. Previous comments stated to put the gauge after the return check valve? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 As long as it is between the lift pump and the regulator, your good.. there are a couple other ports you can use, but this is a clear depiction of one that works.. jojo Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 I have it after the regulator, which i was told previously that’s correct. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 Before the regulator, this way the fuel is held back by the regulator, so the gauge will read correctly.. 1 Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 Well crap, have to redo my whole set up. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 Tell you what.. on the front of the engine, above the over board breather, is a 1/4 npt. Plug.. it takes a 1/4 drive ratchet extension to remove it.. you can hook to it,. There is also 2 other ports directly behind the block, right in line with the EUP's.. you can use one of them. Then you can put the regulator back in the normal way.. if you remove any of those plugs, be sure to dry it off and dope it really good, and put it in tight.. Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted January 31, 2023 Share Posted January 31, 2023 2 Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted January 31, 2023 Author Share Posted January 31, 2023 Got it, thanks. That front ones easy access. Any idea if it’s NPT thread or what? Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted January 31, 2023 Share Posted January 31, 2023 Npt Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted January 31, 2023 Share Posted January 31, 2023 There just pipe plugs Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted January 31, 2023 Share Posted January 31, 2023 1/4" NPT 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted January 31, 2023 Share Posted January 31, 2023 1 hour ago, Joey Mack said: 1/4" NPT I have both setups in my box so handy I even made an adaptor for MP engines from an old oil pressure sensor! its nice to have a 2-3 inch pipe nipple and coupler to change up to an elbow of some sort there . that way you can use plastic or wire braid or what have you on the hose to the gauge remove the cap from the crank case breather for easier access! I have a long hose to monitor from the cab when driving! I use this setup for oil preasure fuel preasure and air! 8ft of 1/4 single braid hose ! handy for most all testing ! 1 1 Quote Link to comment Share on other sites More sharing options...
Popular Post 2wdiesel2021 Posted February 1, 2023 Author Popular Post Share Posted February 1, 2023 Ok, got the fuel gauge plumbed in and had a fairly consistent 70psi. Took the EPU harness off and inspected and couldn’t find a problem anywhere. Reinstalled new split loom and put back in the truck. Started the truck and had a very obvious miss at idle. Getting a code for 2 cylinder voltage high. Go move wires around and saw spark right where the wiring touches. No bare wires at all but it was arcing through the insulation. Repaired the wire and now everything is good. And the sewing needle on the pins on the harness worked great. Thanks guys for all the help. 2 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted February 1, 2023 Share Posted February 1, 2023 That's great.. Your trouble shooting of the EUP harness was good, and very useful for you and others in the future.. You found an issue that I have seen often.. Jojo Quote Link to comment Share on other sites More sharing options...
2wdiesel2021 Posted February 1, 2023 Author Share Posted February 1, 2023 What’s crazy is you couldn’t actually see an issue at all. The wiring looked very good, it’s where it was twisted to go to the EPU. It was dark in the shop and under the heat shield and i literally saw sparks and that was a good thing. 1 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted February 1, 2023 Share Posted February 1, 2023 19 minutes ago, 2wdiesel2021 said: What’s crazy is you couldn’t actually see an issue at all. The wiring looked very good, it’s where it was twisted to go to the EPU. It was dark in the shop and under the heat shield and i literally saw sparks and that was a good thing. Agree being kept in the dark is good some times! 😂 Thanks for posting your fix! Definitely something to try if your search for clues! Turn the lights out! 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted February 1, 2023 Share Posted February 1, 2023 I have a question,,, '2wdiesel2021'.... Did you happen to record the wire number off of the insulation, on the bad wire?.. It should say something like EJ-3 -41,,, something like that... If it isnt too much trouble to look at the bad wire, by peeling back the loom to read it... if you can't,,, that's ok... I was curious if it was the power wire for EUP 1,2+3,,, or the EECU signal wire, for #2.. Glad you got it fixed, and really glad you didn't load a parts cannon and shoot a couple grand worth of parts, due to a bad wire.. That happens a lot.. Good on you!! Jojo 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted February 2, 2023 Share Posted February 2, 2023 2 hours ago, Joey Mack said: I have a question,,, '2wdiesel2021'.... Did you happen to record the wire number off of the insulation, on the bad wire?.. It should say something like EJ-3 -41,,, something like that... If it isnt too much trouble to look at the bad wire, by peeling back the loom to read it... if you can't,,, that's ok... I was curious if it was the power wire for EUP 1,2+3,,, or the EECU signal wire, for #2.. Glad you got it fixed, and really glad you didn't load a parts cannon and shoot a couple grand worth of parts, due to a bad wire.. That happens a lot.. Good on you!! Jojo Joey a guy would think if he pu on a spark or arcing it would be a power wire ! 1 Quote Link to comment Share on other sites More sharing options...
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