redwolf624 Posted June 24, 2013 Share Posted June 24, 2013 i gotta question, what could cause me to go from bein in between 1/2 and 1/4 of a tank of gas to 1/4 in a matter of ten minutes, saturday i drove all over town purdy much and stayed in between 1/2 and 1/4 of a tank of gas, went to work today (ten minute drive from my house) and was still in between the two but i get home and i'm a 1/4, i don't have a fuel leak (i hope not since i just replaced every hose on my MJ) but i do have a 2se carb and a 5 speed manual, could it be the gears i'm in cause my truck to use more gas? Redwolf Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 25, 2013 Share Posted June 25, 2013 Since you were between 1/4 and 1/2...when you stated driving...you must have used 1/8 of a tank. 2 gallons. Sounds normal to me. Only way to know for sure is to measure it over a tank or two. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 25, 2013 Share Posted June 25, 2013 Well, I will say this much... The sending units in our Jeeps are not very precise. After my XJ gets down to "half" a tank, I notice it finds its way to E a lot quicker than before it got to half. Link to comment Share on other sites More sharing options...
jimoshel Posted June 25, 2013 Share Posted June 25, 2013 Gas gauges are not laboratory precision instruments. They just display a general reading. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 25, 2013 Author Share Posted June 25, 2013 so this could very well be normal and i'm not havin a gas hog issue it's just the nature of the beast and the indecator? also what could cause the gas gauge needle to dance while i'm drivin because that's bothers me really bad, Redwolf Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 25, 2013 Share Posted June 25, 2013 Bouncing around is pretty common too lol. Again, it's due to the fact that it's a simple and antiquated design. The gas sloshes around a lot in the tank while you're moving, so the gauge will serve only to give you a rough estimate of the amount of gas. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 25, 2013 Share Posted June 25, 2013 If I fill my tank I can drive 75 - 80 miles before the needle even moves. Another 75 miles it goes from full to half. I goes to 1/4 tank after another 75...and so on. Inaccurate yes, but if you drive it long enough you should get the feel for it. If I'm going downhill to the left, it reads fuller than if I'm going uphill, to the right. Since the fuel moves, so does the needle. The sender is just a float...open up the back of your toilet...it's like that. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 25, 2013 Author Share Posted June 25, 2013 ok, thanks yall, stock for stock what size tank should an 86 comanche custome have? Redwolf Link to comment Share on other sites More sharing options...
jimoshel Posted June 26, 2013 Share Posted June 26, 2013 Standard tank was 16 gal. Optional tank was 23.5 gal. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 26, 2013 Author Share Posted June 26, 2013 should it say some where on the truck what size like on the inside of the door or on the tank or somethin? Redwolf Link to comment Share on other sites More sharing options...
88whitemanche Posted June 26, 2013 Share Posted June 26, 2013 You'll notice the difference in tanks...the 16gal tank has two straps holding it and the 23.5gal has three straps holding the tank Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 26, 2013 Share Posted June 26, 2013 You'll notice the difference in tanks...the 16gal tank has two straps holding it and the 23.5gal has three straps holding the tank :hmm: Ummm... mine is a 16 gallon tank and it has 3 straps holding it up... I'm not so sure that's a good way of identifying tank sizes. Better yet to the OP, there should be a little plate on the size of the tank, same side as the pump assembly, and center of the tank, just slightly above the pinch seam. It will either have a "16 gal" engraved or "23.5 gal". Link to comment Share on other sites More sharing options...
88whitemanche Posted June 26, 2013 Share Posted June 26, 2013 Hmmm maybe each truck is different. Mine has two straps and I saw one at the jy with a 23.5 with three straps Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 26, 2013 Share Posted June 26, 2013 That's a possibility given these trucks have parts in them from factory with no rhyme and no reason lol. Link to comment Share on other sites More sharing options...
jimoshel Posted June 26, 2013 Share Posted June 26, 2013 Also there is no knowing what mods any number of previous owners did to them. A 16 gal tank will only reach 3/4 of the way between the front of the bed and the rear wheel well. A 23.5 gal tank will occupy all the space between the front of the bed and rear wheel well. So far I have never seen a plate, tag or label giving a tank size. I have pulled over a dozen of them. Also the difference between short bed and long bed will effect tank size, placement. The long bed MJ will have a 16 gal tank standard. 23,5 gal optional. A short bed MJ will have a standard 18.5 gal tank. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 26, 2013 Author Share Posted June 26, 2013 well i'll look on the tank, i'll look for a plate, by trucks bed is weird though it's 7'8" i think eith 8" or 6" but either way a little over 7' and a half (by the way is that considered an 8' bed?) Redwolf Link to comment Share on other sites More sharing options...
ParadiseMJ Posted June 26, 2013 Share Posted June 26, 2013 (by the way is that considered an 8' bed?) No, it's considered a "long" bed. There is no Comanche 8' bed. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 26, 2013 Author Share Posted June 26, 2013 ok, so it is a small truck with a long bed :) if i was to go shoppin for camper shells what size would i have to get for it or would it have to be custom made? Redwolf Link to comment Share on other sites More sharing options...
redwolf624 Posted June 26, 2013 Author Share Posted June 26, 2013 so i do have a 16 gal tank, same size as my dads and i know thats a 16 gal tank, but it looks like it's supposed to have 3 straps on it, i got one in the rear, one in the middle but the two ends are held on my the gas tank shroud but the rear strap in in between the tank and the shroud is that normal? Redwolf Link to comment Share on other sites More sharing options...
87MJTIM Posted June 27, 2013 Share Posted June 27, 2013 The long bed MJ will have a 16 gal tank standard. 23,5 gal optional. A short bed MJ will have a standard 18.5 gal tank. I thought the '86 were only the long beds. The short beds were not introduced until '87. The OP says he has an '86. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 27, 2013 Author Share Posted June 27, 2013 The long bed MJ will have a 16 gal tank standard. 23,5 gal optional. A short bed MJ will have a standard 18.5 gal tank. I thought the '86 were only the long beds. The short beds were not introduced until '87. The OP says he has an '86. i thought MJs even in 86 came with short beds, Redwolf Link to comment Share on other sites More sharing options...
87MJTIM Posted June 27, 2013 Share Posted June 27, 2013 From what I have read, the shorty was intro'd in '87. See http://www.comanchemj.1hwy.com/photo6.html about 1/2 way down page Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted June 27, 2013 Share Posted June 27, 2013 The '86s were only long beds. Standard 16 gal tank with 23.5 gal optional. There should be three straps holding up the tank, the first strap (nearest to the front of the Jeep) has a "skid plate" if you can call it that. It's made of plastic and is bolted to the first strap. The engraved plate may or may not still be there. Mine was, so that's how I know its true capacity. Link to comment Share on other sites More sharing options...
redwolf624 Posted June 27, 2013 Author Share Posted June 27, 2013 i got it now, i got a 16 gal tank, Redwolf Link to comment Share on other sites More sharing options...
redwolf624 Posted June 28, 2013 Author Share Posted June 28, 2013 is it possible to have a 10 gal tank? i filled my MJ up today from E to F and it only costed 35 bucks but that was only 10 gallons, where's the other 6? Redwolf Link to comment Share on other sites More sharing options...
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