OK......stupid question especially as anti-omix as I am. But.......here goes: Omix fuel sending unit for my '71 V6 (rear 15 gallon tank) may be the physical solution to the leak I had because the top of the sending unit appears to be correctly manufactured whereas the Crown part is not. The Crown part is stamped flat and does not have a slight flange/bevel stamped around the outside edge like the Omix part does and like the one I took out does. Without the flanged edge, there nothing on the sending unit side of things to help retain the O ring. This is what happened to me with the Crown part. The O ring somehow rolled out from under the sending unit. It was correctly installed on the tank before the tank went in. Also, the Crown unit has ports that stick up higher than the ports on the one I took out. It was a very tight tight fit up against the body tub. Maybe that had something to do with the O ring rolling out as well. Like if contact with the body, while wheeling, rubbed the lines and ports and moved the sending unit around a little. Certainly possible I believe. I am curious if the ports on the Omix are shorter. So, I guess my question is: Has anyone used the Omix sending unit in a rear tank and what were your findings? They list 2 different ones. One is specifically designated as for the V6 and costs 15.00 more than the other which is listed as fitting all cj5 with 15 gallon rear tank. Wondering what the difference is. Also wondering if it will last electrically. Dealt with a totally screwed up one for many years now. The Crown replacement got stuck on full the first time I filled the tank, though I have not ruled out a faulty gauge yet. I'll to add some pics to help clarify things later. Heres the link to the Crown unit. Maybe you can see the flat stamped area around the outside edge of the unit. Crown Automotive 5357373K 15 Gallon Fuel Sending Unit for 69-86 Jeep CJ Series And the Omix unit where you can see the stamped flange or bevel around the edge that help retain the O ring. The V6 specific part is similar in this respect but 15.00 more expensive. OMIX 17724.07 Fuel Sending Unit for 70-83 Jeep CJ Vehicle's with 15 Gallon Tank And finally the V6 specific part. OMIX 17724.04 Fuel Sending Unit for 67-71 Jeep CJ-5 & CJ-6 with 225c.i.