BaronVonChahyll Posted June 22, 2020 Share Posted June 22, 2020 This may be a dead horse but I dropped my tank and its toast along with the fuel pump and sending unit. Can I pull a complete tank/pump/sending unit from a Cherokee with the same engine and put that in? I know that it will require altering the location of the tank and extending line to the tank but is that all I need to do? Link to comment Share on other sites More sharing options...
Zambeezy Posted June 22, 2020 Share Posted June 22, 2020 16 minutes ago, BaronVonChahyll said: Can I pull a complete tank/pump/sending unit from a Cherokee with the same engine and put that in? I'm just now getting back to the Comanche world but if I recall correctly, the sending unit on an XJ is different than it is on the MJ due to differences with the hanger. What are the specs of your truck? SWB or LWB, and 23 gal or 16 gal tank? Link to comment Share on other sites More sharing options...
87MJTIM Posted June 22, 2020 Share Posted June 22, 2020 First of all: What year is your MJ? What engine? What size was the tank you removed? Completer your signature with that info. The tank from an XJ will not fit. There are after market MJ tanks available. I bought one about 5-6 year ago. Search RockAuto. The sending unit from an XJ will not fit. It faces the wrong direction. Search for MTS on Comanche Club. They sell aftermarket pumps/sending units. Other than those two items, the last one (pump) will swap over. Link to comment Share on other sites More sharing options...
BaronVonChahyll Posted June 22, 2020 Author Share Posted June 22, 2020 1989 2WD Pioneer 23 Gal Tank 4.0 L Engine I am not necessarily looking for a tank that will 100% fit. I heard that some people have had success with an XJ Fuel Tank AND Sending Unit mounted where the spare tire goes Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 22, 2020 Share Posted June 22, 2020 7 minutes ago, BaronVonChahyll said: I am not necessarily looking for a tank that will 100% fit. I heard that some people have had success with an XJ Fuel Tank AND Sending Unit mounted where the spare tire goes But why go through the effort when the resources are readily available for a direct bolt in factory parts job? Link to comment Share on other sites More sharing options...
BaronVonChahyll Posted June 22, 2020 Author Share Posted June 22, 2020 A complete fuel tank and sending unit/pump that is ready to plug into the harness/ fuel lines possibly available from a local salvage yard might be cheaper/more readily available than getting an all new tank and unit. I do want to do that in the future but the current engine has 305K miles. I am just wanting to get this thing running and moving with a lot of the restoration being done at a later point. Not sure if that makes sense Link to comment Share on other sites More sharing options...
87MJTIM Posted June 23, 2020 Share Posted June 23, 2020 So, let me get this straight. You want to perform a lot of modifications and fabricating (which will take time and money) only to undo what you did to take it back to what you had. Do I have that correct? Link to comment Share on other sites More sharing options...
Eagle Posted June 23, 2020 Share Posted June 23, 2020 4 hours ago, BaronVonChahyll said: This may be a dead horse but I dropped my tank and its toast along with the fuel pump and sending unit. Can I pull a complete tank/pump/sending unit from a Cherokee with the same engine and put that in? I know that it will require altering the location of the tank and extending line to the tank but is that all I need to do? Cherokee tank won't fit under an MJ. Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted June 23, 2020 Share Posted June 23, 2020 5 hours ago, BaronVonChahyll said: Can I pull a complete tank/pump/sending unit from a Cherokee with the same engine and put that in? I know that it will require altering the location of the tank and extending line to the tank but is that all I need to do? I'll answer your questions as asked, then ask one of my own: For the "can you" question --> Yes. Yes you can. For the "all I need to do" question --> No. Mounting points, hangers, bolts and bolt locations, extending wiring, etc. Plus there will be A LOT of the "oh $#!& what do I do about . .. . " that happens with this. Then you need to consider you are replacing old components that are worn out with ... old components that might be worn out. And going through all the effort to do that. Now my question: Why the @#$% would you ever do that? Put in correct stuff and quit bitching over a few $$$ upfront. For the ease of install, ease of future fixes, and reliability in the long run its worth every peny. Or ignore everyone on this thread and do your own thing. Maybe your idea is awesome and we are all just too stupid to see it. Link to comment Share on other sites More sharing options...
thecodemonk Posted June 23, 2020 Share Posted June 23, 2020 The long and short of it is that anything is possible with enough time, money, and ingenuity. That said, like most everyone else here has indicated, it'll be cheaper in the end (both time and money) to use the proper part for this, especially since this is one of the few parts on the rear of a MJ that is still readily available from the aftermarket. A number of people have tried to go down the road you're proposing and nearly all of them gave up or ran into a roadblock that made it not worth the effort in the end. This is one of those "one time" costs that is worth it. Link to comment Share on other sites More sharing options...
omega_rugal Posted June 24, 2020 Share Posted June 24, 2020 it depends on how good you are at modding/fabbing most of the time the people against such things only do bolt-in jobs, or minimal modding required jobs... are you going to use an XJ tank justo to stay all-jeep? you can put it in the back of the bed where the spare is, it fits but you need to figure out how strap it there Link to comment Share on other sites More sharing options...
BaronVonChahyll Posted June 25, 2020 Author Share Posted June 25, 2020 Thanks for all the help here. Not super experienced in any of this. This is my first project car and I do not have professional training or a deep history of wrenching/having friends who do. I got this truck because I have a love for the Cherokee (First car at 16) and ever since I first saw a Comanche I wanted one. I also got this truck so I can learn how to do some of this work and what goes in to all this. I am going to get a sending unit/pump from MTS and I am getting a tank from some online retailer I haven't figured out yet. If anyone knows of a plastic tank feel free to link me. Thanks again Link to comment Share on other sites More sharing options...
Pete M Posted June 25, 2020 Share Posted June 25, 2020 I've never heard of a plastic MJ tank. the late 90s Dakota would have a plastic tank that fits, but the pump stuff would be harder to adapt. the link in my signature would have a couple writeups on guys that used the Dak tank, but they were in conjunction with 97+ swaps which better matched the dakota pump style. when you get your new tank, do a scuff, chemical clean, primer and a couple coats of paint and it should last a looooong time. Link to comment Share on other sites More sharing options...
DirtyComanche Posted June 25, 2020 Share Posted June 25, 2020 Given how cheap the repop MJ tanks are, and that MTS is now making the senders, the only justification for not going that route is if you're either doing a 97+ swap, or if you're insane. I'm in the second group. Link to comment Share on other sites More sharing options...
Eagle Posted June 25, 2020 Share Posted June 25, 2020 Anything CAN be done. The question is whether ir SHOULD be done. You can probably find a way to hang a Cherokee tank under the back of an MJ, beneath where the spare tire is supposed to be. Of course, you lose access to the spare tire, which means you have to carry it in the bed ... which means you'll need to figure out a way to lash it securely in place. More importantly, the tank won't fit neatly up inside the frame rails (or X) -- it will have to hang below the frame. It will be at the very rear of the chassis, so it will be exposed to "tail strikes" (aviation term) when transitioning to steep grades, plus it'll be RIGHT THERE, waiting to get smacked if you get rear-ended. If you want to know why that's not a good thing, Google "Pinto gas tank issues." Here's a start: https://users.wfu.edu/palmitar/Law&Valuation/Papers/1999/Leggett-pinto.html https://philosophia.uncg.edu/phi361-matteson/module-1-why-does-business-need-ethics/case-the-ford-pinto/ https://www.history.com/this-day-in-history/fatal-ford-pinto-crash-in-indiana https://florinpopa.files.wordpress.com/2011/03/ford-pinto.pdf Link to comment Share on other sites More sharing options...
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