99Manche Posted October 12, 2011 Share Posted October 12, 2011 personally I'd be a cheap a** and take the stock manifold off and weld the crack, but if you have money burning a hole in your pocket then go for the header, if your going to buy something then make it worth your while and get a couple extra horses out of it. I wondered if the 15 gallon tank was taller like the 22 gallon tank is, now I'm not the sharpest tool in the shed sometimes but what if somehow you used the fuel gauge sending unit off a xj pump assembly on the Dakota assembly, just sayin if we can completely modify an old mj to run the newer drivetrain that should be simple right? I'd like to see the tiregate Link to comment Share on other sites More sharing options...
terrawombat Posted October 12, 2011 Share Posted October 12, 2011 I haven't looked at the fuel sending unit too closely, but I do remember a few things about it when I contemplated doing exactly what you said. It's incredibly flimsy and looks like something that break into a billion pieces if you tried to remove it and swap it over. My original thought was to just swap over the "resistance" pad from the XJ assembly onto the Dakota one and I looked at how to go about doing that, but gave up when I felt like I was going to destroy it. I did some resistance measurements on the two assemblies and I don't remember what the numbers are off the top of my head, but this could all be solved by adding an appropriately sized inline resistor into the circuit....potentially... Link to comment Share on other sites More sharing options...
99Manche Posted October 13, 2011 Share Posted October 13, 2011 well, I've got to try it, at one of the local yards there is a 22 gallon tank with the pump in it already out of the truck and I think I'm gonna go pick it up, I have an extra complete xj pump plus another one that I used for parts, I will see what I can come up with. I've got to try something I can't stand anything being wrong with my truck Link to comment Share on other sites More sharing options...
99Manche Posted October 13, 2011 Share Posted October 13, 2011 geez, can't I get a break sometimes? I went to the salvage yard just to find out they are closed for some reason until monday.... Guess I'm sol until then. :fs1: I do have another idea brewing in my head but don't know if I want to try it without another tank handy, my younger brother works at a plastics place and they have plastic welders and anything I may need, I'm thinking about taking my 22 gallon plastic tank and making it shorter in height and length by cutting sections out and welding it back together, any thoughts on that? Link to comment Share on other sites More sharing options...
BHelton Posted October 14, 2011 Author Share Posted October 14, 2011 Got bored so i finished up my tiregate!! Link to comment Share on other sites More sharing options...
99Manche Posted October 14, 2011 Share Posted October 14, 2011 I likes! Never thought about doing it like that, but I think I'd rather have one on my roll bar so I could keep my tailgate but it is super nice and a great idea. Link to comment Share on other sites More sharing options...
BHelton Posted October 15, 2011 Author Share Posted October 15, 2011 Planning on doing bedlinen today and some interior lights aswell. Thanks for the compliment on the tire gate. Replaced the exhaust manifold last night andno more exhaust leak!!! Link to comment Share on other sites More sharing options...
99Manche Posted October 15, 2011 Share Posted October 15, 2011 that's fun changing them manifolds isn't it? Kinda of a tight squeeze. I really need to quit putting off doing the paint work and such on my truck, I was just hoping to get it running right before I do it but before I know it winter is going to be here and I'm not going to want to do any body work Link to comment Share on other sites More sharing options...
BHelton Posted October 15, 2011 Author Share Posted October 15, 2011 that's fun changing them manifolds isn't it? Kinda of a tight squeeze. I really need to quit putting off doing the paint work and such on my truck, I was just hoping to get it running right before I do it but before I know it winter is going to be here and I'm not going to want to do any body work Wasn't that bad....got bed liner sprayed today, replaced the fan clutch and getting ready to change the alternator Link to comment Share on other sites More sharing options...
99Manche Posted October 17, 2011 Share Posted October 17, 2011 Hooked the fuel pump up to a spare battery and drained the fuel in the tank into a couple of gas containers (will come in handy for my generator in case the hurricane takes my power out). Kept draining the tank until it started to just trickle out and disconnected the pump so I didn't overheat and burn it out. With the tank damn near empty, the resistance reading on the XJ fuel pump assembly is about 440 Ohms. So, knowing that, it looks like the Dakota fuel level sensor won't quite work with the XJ PCM and cluster. If my theory is correct, the Dakota fuel level sender will never drop the XJ cluster below a half tank. I'm not sure what will happen when the Dakota tank is full, but it would likely just peg the fuel needle to the right on the XJ cluster. I wonder if that sort of variable can be edited in the programming with the SCT tuning software or possibly even a DRB III scanner... Time to do more research... BTW, this was all pretty much a moot point for me since I will be using a ZJ PCM in my 5.9L Magnum build, so there is still hope. Just need to see what the ZJ fuel pump assembly measures...hopefully it's the same as the Dakota! I just got back from the salvage yard, I picked up another 22 gallon dakota tank, this one is from a 97 and it came with the pump assembly, I broke down and bought a new digital multimeter cause the ones i had were pretty old and I didnt trust them, measured resistance on the dodge tank and got 20 full and 220 empty, then I took a sending unit that I had laying around off of i believe a 98 cherokee and got 20 full and 216 empty. I'm no genius but I believe the dakota assembly will work without a problem well, I'm heading back out to the garage to start dropping my tank in the mj and test out this dakota assembly, wish me luck Link to comment Share on other sites More sharing options...
87Warrior Posted October 17, 2011 Share Posted October 17, 2011 If those ohm readings are accurate, this looks very promising. Keep us posted. :popcorn: Link to comment Share on other sites More sharing options...
terrawombat Posted October 17, 2011 Share Posted October 17, 2011 That's odd. I'll have to re-test my '99XJ fuel pump assembly when I actually drop the tank and have the thing on a bench. Link to comment Share on other sites More sharing options...
99Manche Posted October 17, 2011 Share Posted October 17, 2011 ok, the wife reminded me that I had some honey dos before I started on the truck, what I got so far is the tank dropped and the adaptor harness built, I plugged it into my truck harness to test the fuel gauge. I tested it at empty, half tank, and full and the gauge in my dash read accordingly, it works perfect. The pump did not kick on when I turned my key on though so gotta do some checking there, maybe a faulty pump more updates to come Link to comment Share on other sites More sharing options...
terrawombat Posted October 17, 2011 Share Posted October 17, 2011 You need to start your own build thread so we stop crapping up this one. Link to comment Share on other sites More sharing options...
99Manche Posted October 17, 2011 Share Posted October 17, 2011 ya I'm kind of a hijacker sometimes :hijack: start one in just a minute Link to comment Share on other sites More sharing options...
BHelton Posted October 18, 2011 Author Share Posted October 18, 2011 That's OK, I can just throw some pics up and keep on absorbing information from y'all as well Link to comment Share on other sites More sharing options...
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