Guyverix Posted September 2, 2022 Share Posted September 2, 2022 I just replaced the fuel pump and sending unit. Now at full it shows a half tank. Seems to drop correctly as I use fuel, but not all that helpful to me as you can guess. I had a hell of a time installing it since it was an emergency repair literally in a field. What are the chances that I bound up the float with the sock, when I installed it vs. me screwing up and ordering the wrong pump/unit ? The reason I ask is I am not thrilled with the idea of dropping the tank, but will if it was me screwing this up. Just want opinions from people who have more experience than I do working with this stuff. It was a first time repair for me. I have already cleaned up my grounds, and am still considering adding an additional one to the tank ground via the bolt for the fuel filter as some of the howtos suggest, but have not done that yet.. I was also in the middle of changing out my instrument cluster at the time, and testing with both clusters show the same behavior, so I know it is not on the cluster end.. Link to comment Share on other sites More sharing options...
Guyverix Posted September 2, 2022 Author Share Posted September 2, 2022 Jeez, just realized it might be dependent on the model and such. Sorry about not enough info.. 1986 Comanche 2.5L 180K miles.. Overall wiring in good shape All common grounds shown in howtos have been cleaned up and redone. No additional grounding has been added at this time yet however. Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 2, 2022 Share Posted September 2, 2022 There are two sending unit styles. There’s the 23.5/18 gallon and 16 gallon sending unit. If you have an 86 2.5L, chances are you have the 16 gallon(23.5 and 16 gallon share the same tank architecture but the baffle for fuel filling is at different heights inside the tank) and you probably installed the 23.5/18 gallon sending unit. Which is why it’s stopping at half when full. Link to comment Share on other sites More sharing options...
Guyverix Posted September 2, 2022 Author Share Posted September 2, 2022 Well damn! I screwed up then.. Thanks for the correct info.. Now to do it all again... Anyone need a pump / sending unit slightly used? LOL! Link to comment Share on other sites More sharing options...
Guyverix Posted September 2, 2022 Author Share Posted September 2, 2022 Hmm, looking on both ebay and trexautoparts show nothing for 16 Gal systems, and my old sending unit is actually dead. Is this model able to be upgraded to a bigger tank and have it send proper readings then? Link to comment Share on other sites More sharing options...
eaglescout526 Posted September 2, 2022 Share Posted September 2, 2022 Lol no problem. The 16 gallon sending unit has a shorter float arm than the 23.5/18 one. You can get a bigger tank yes. Link to comment Share on other sites More sharing options...
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