Knucklehead97 Posted October 29, 2014 Author Share Posted October 29, 2014 MAP sensor is on and reading correctly. Helped the fluctuation a little bit but didn't change anything else. I also found out that my fuel pressure regulator vacuum line was clogged... No vacuum. I fixed that and it didn't change anything really. Still stalls out some, fluctuates, and is a really low idle. I've changed just about every sensor on this dang thing. I'm starting to think this is a fuel problem but it really doesn't seem likely. Could the CTS have anything to do with this? It's basically the only sensor I haven't changed. I'm going to continue cleaning electrical connectors when it stops raining tomorrow and I'm going to grab a fuel pressure gauge. What else do I need to do? Link to comment Share on other sites More sharing options...
Knucklehead97 Posted October 29, 2014 Author Share Posted October 29, 2014 Oh and the vacuum line was clogged by being melted in one of the elbows. I changed the line with some aluminum tubing. Link to comment Share on other sites More sharing options...
cruiser54 Posted October 30, 2014 Share Posted October 30, 2014 CTS can be tested. Click on my tech photos and scroll through for the CTS and IAT values. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted October 30, 2014 Author Share Posted October 30, 2014 Can they both cause these problems? Also what about the actual computer in the truck, do you think it could be bad and causing this? Link to comment Share on other sites More sharing options...
cruiser54 Posted October 30, 2014 Share Posted October 30, 2014 Can they both cause these problems? Also what about the actual computer in the truck, do you think it could be bad and causing this? Doubtful it's the ECU. But Tip 9 covers refreshing the connections. Might be worth a try. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted October 31, 2014 Author Share Posted October 31, 2014 Got a fuel pressure gauge and plan to run the tests tomorrow morning. I know it needs 31 with the key ON and the regulator connected and 40 with the regulator disconnected. But how will disconnecting the regulator change anything if the engine isn't running and providing vacuum? What PSI's should I looking for while the engine is idling? And lastly how do I check to make sure the regulator is operating correctly? Lot's of questions, I know. But slowly chipping off the possibilities.Thanks. Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2014 Share Posted October 31, 2014 Gotta be running. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted October 31, 2014 Author Share Posted October 31, 2014 Is it supposed to have to be running to even show on the pressure gauge? Because mine showed zero no matter how many times I set the key to ON. But when I cranked the truck it had 28 PSI with vacuum and 36 with no vacuum. Showing about 3-4 PSI low. Immediately when I shut the truck off the gauge went back down to 0. As far as I can tell, my fuel pressure regulator is working properly. But something in the fuel system seems weak or clogged, right? Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2014 Share Posted October 31, 2014 Is it supposed to have to be running to even show on the pressure gauge? Because mine showed zero no matter how many times I set the key to ON. But when I cranked the truck it had 28 PSI with vacuum and 36 with no vacuum. Showing about 3-4 PSI low. Immediately when I shut the truck off the gauge went back down to 0. As far as I can tell, my fuel pressure regulator is working properly. But something in the fuel system seems weak or clogged, right? Weak or leaking, correct. Pull the vacuum hose of the fuel pressure regulator and see if it smells like gasoline. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 2, 2014 Author Share Posted November 2, 2014 The vacuum line smells strongly of gas, actually. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 2, 2014 Share Posted November 2, 2014 I wonder if your fuel pressure regulator has a hole in the diaphragm. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 2, 2014 Author Share Posted November 2, 2014 Its the original regulator. Very possible it needs to be changed. Along with everything else, it seems lol Link to comment Share on other sites More sharing options...
cruiser54 Posted November 2, 2014 Share Posted November 2, 2014 Its the original regulator. Very possible it needs to be changed. Along with everything else, it seems lol One thing at a time. You're doing a great job of doing things logically. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 6, 2014 Author Share Posted November 6, 2014 Well thank you, sir :thumbsup: quick update is that I've gotten no progress at all done on the truck, sadly. I've got to order a fuel pressure regulator and get a filter to swap in but just haven't gotten the time between church and interviews/training for a job. Progress on every aspect of my truck should soon pickup as I finally got a weekly paying job and don't have to cut corners as much hopefully. Can I replace the regulator without removing the fuel rail? Link to comment Share on other sites More sharing options...
cruiser54 Posted November 6, 2014 Share Posted November 6, 2014 Well thank you, sir :thumbsup: quick update is that I've gotten no progress at all done on the truck, sadly. I've got to order a fuel pressure regulator and get a filter to swap in but just haven't gotten the time between church and interviews/training for a job. Progress on every aspect of my truck should soon pickup as I finally got a weekly paying job and don't have to cut corners as much hopefully. Can I replace the regulator without removing the fuel rail? I can't remember.  And congrats on the job!! Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 10, 2014 Author Share Posted November 10, 2014 Thanks again :yes: Standard Motor Products Regulator and a Wix filter is on the way. Does a dealer sell the 2 O rings that go on the quick disconnect fuel line in the regulator? I can get them 2 for 10$ from Advance but I mean 10$ for 2 Orings is ridiculous... Link to comment Share on other sites More sharing options...
cruiser54 Posted November 10, 2014 Share Posted November 10, 2014 Thanks again :yes: Standard Motor Products Regulator and a Wix filter is on the way. Does a dealer sell the 2 O rings that go on the quick disconnect fuel line in the regulator? I can get them 2 for 10$ from Advance but I mean 10$ for 2 Orings is ridiculous... Probably not.  Fuel disconnects  Quick disconnect part numbers  So far the Napa part numbers for just orings is:  Napa 730-5018 3/8 Viton individual orings $1.56 each Napa 730-5017 5/16 Viton individual orings $1.35 each Napa CRB 212305 fuel line repair kit 5/16? $15.93 each   Mopar repair kits:  83502745 fuel line repair kit 5/16 $6.99 Morris 83504447 fuel line/Trans line repair kit 3/8 $8.99 Morris Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 15, 2014 Author Share Posted November 15, 2014 Luckily the regulator came with all the Orings. The one for the fuel rail and the two for the line (and the spacer!). I've been waiting for a clear day to swap everything in. I'm highly considering again sending back this TPS and ordering one of the MOPAR ones once I get my paycheck Tuesday... There is just SOMETHING that bugs me about the fact that the new TPS mostly fixed the problem and there has been reports of aftermarket TPS's not being as good as OE. Just something thats been burning in the back of my mind. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted November 27, 2014 Author Share Posted November 27, 2014 Update finally! Regulator and filter are both on and neither leak from what I can tell. I couldn't start the truck because I need to get a smaller elbow for the vacuum line connection on the regulator. Old one was way to big. The fuel pump is loud. I've recently (since upgrading my positive cables) noticed it being much louder than it used to. But if I leave the key off for more than 10 seconds then the fuel pump runs again when I turn the key to ON. Is there any test for the fuel pump to tell if it's not working correctly? I can't find a leak ANY where. Not even on the sending unit where I had to fix a leak with Quik Steel last summer. If I have to change the fuel pump then I'm going to be looking for a good sending unit because my gas gauge doesn't work and I want to go ahead and fix it if I can while I have the fuelpump/sending unit assembly out. Link to comment Share on other sites More sharing options...
cruiser54 Posted November 27, 2014 Share Posted November 27, 2014 Fuel pressure test, but loud is generally a sign of pending failure. Link to comment Share on other sites More sharing options...
Dadinator Posted December 8, 2014 Share Posted December 8, 2014 Kh, have you started the truck since this? Is it fixed? I am working on all the ground refreshes now. I seem to have pretty good grounds from what i can tell though. Link to comment Share on other sites More sharing options...
cruiser54 Posted December 8, 2014 Share Posted December 8, 2014 Kh, have you started the truck since this? Is it fixed? I am working on all the ground refreshes now. I seem to have pretty good grounds from what i can tell though. That's just it. You can't really "tell". You just have to be thorough and go through the procedures. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted December 9, 2014 Author Share Posted December 9, 2014 I still haven't gotten to rent a fuel gauge and get a vacuum line elbow and start the truck again. My work schedule has been horrible lately. It'd be done if Oreillys renting time wasn't just 2 days... haven't gotten a day where I could rent it, use it, and take it back within the next couple days. I'm hoping and praying to get it done this weekend. I need a garage... Link to comment Share on other sites More sharing options...
cruiser54 Posted December 9, 2014 Share Posted December 9, 2014 You'll get it done.... Link to comment Share on other sites More sharing options...
Knucklehead97 Posted December 12, 2014 Author Share Posted December 12, 2014 I managed to connect a fuel pressure gauge and test the regulator. And guess what? The system actually holds its pressure for about 30 seconds now. And I think the low pressure is Oreillys giving me a faulty pressure gauge. The gauge constantly leaks fuel through the plastic line, even when I don't hold down the relief button. I'm thinking thats why I'm only getting 26 PSI with vacuum and 34 without. Just can't build up enough pressure while its constantly flowing through the gauge. Or am I wrong and the pressure gauge is supposed to do that? It just makes sebse to me that it shouldn't... But hey! The regulator fixed one thing so far :D progress! Link to comment Share on other sites More sharing options...
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