Andrew miller Posted September 24, 2019 Share Posted September 24, 2019 Help needed! I have a 1988 Comanche (MJ) base model and I am trying to replace the fuel pump/ sending unit, problem is I can not find one to save my life. Can anyone send me in the right direction? Thanks in advance Link to comment Share on other sites More sharing options...
JMO413 Posted September 25, 2019 Share Posted September 25, 2019 The fuel sender is a little off but it works. Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 25, 2019 Share Posted September 25, 2019 What size gas tank do you have? I have one from a RENIX 23 gallon, pm if interested. Link to comment Share on other sites More sharing options...
Pete M Posted September 25, 2019 Share Posted September 25, 2019 3 hours ago, Andrew miller said: Help needed! I have a 1988 Comanche (MJ) base model and I am trying to replace the fuel pump/ sending unit, problem is I can not find one to save my life. Can anyone send me in the right direction? Thanks in advance after 9 more posts the classifieds will open up to you. Link to comment Share on other sites More sharing options...
Andrew miller Posted September 25, 2019 Author Share Posted September 25, 2019 I ended up calling MTS company and they had exactly what I was looking for! Thank you JM0413 for the info.... I’ve been looking for weeks and have had no luck. What a relief I can finally get back to the trails!!! Link to comment Share on other sites More sharing options...
BeatCJ Posted March 27, 2020 Share Posted March 27, 2020 How is the Fuel Pump working? I am pretty sure that I need one, trying to find the best available. Link to comment Share on other sites More sharing options...
JMO413 Posted March 27, 2020 Share Posted March 27, 2020 Mine is working good except the fuel gauge is inaccurate. Link to comment Share on other sites More sharing options...
derf Posted March 27, 2020 Share Posted March 27, 2020 44 minutes ago, JMO413 said: Mine is working good except the fuel gauge is inaccurate. I don't know that I've ever had an accurate fuel gauge on any single vehicle I've ever owned. Link to comment Share on other sites More sharing options...
AZJeff Posted March 27, 2020 Share Posted March 27, 2020 4 hours ago, derf said: I don't know that I've ever had an accurate fuel gauge on any single vehicle I've ever owned. Older vehicles have notoriously inaccurate and inconsistent fuel gauges. I have seen cars that read “1/8” and were fully empty. I have also owned cars that had 4 gallons left from a 20 gallon tank when it reached “E” However, the one in my Wife’s KJ is pretty good, and the one in my JK is almost exact. I think that have improved calibration procedures in the past 20 years. Link to comment Share on other sites More sharing options...
JMO413 Posted March 27, 2020 Share Posted March 27, 2020 Mine currently will take 12 gallons when it's in empty. I have an 18 gallon tank so it's pretty far off. I would buy it again for sure though. Link to comment Share on other sites More sharing options...
jeeptec1 Posted March 28, 2020 Share Posted March 28, 2020 I had my sending unit rebuilt by tristar radiator in New York. It takes about a month to get rebuilt.Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
BeatCJ Posted March 28, 2020 Share Posted March 28, 2020 22 hours ago, AZJeff said: Older vehicles have notoriously inaccurate and inconsistent fuel gauges. I have seen cars that read “1/8” and were fully empty. I have also owned cars that had 4 gallons left from a 20 gallon tank when it reached “E” However, the one in my Wife’s KJ is pretty good, and the one in my JK is almost exact. I think that have improved calibration procedures in the past 20 years. I think its not so much calibration as completely different technology. I don't believe they use a mechanical wiper on a fixed resistance wire any more. Link to comment Share on other sites More sharing options...
AZJeff Posted March 29, 2020 Share Posted March 29, 2020 Perhaps. The one in my wife’s 2004 KJ is still a wiper across a thick film resistor trace, so that’s “old school” I will investigate what sort of sender my 2014JK uses.... Link to comment Share on other sites More sharing options...
AZJeff Posted March 29, 2020 Share Posted March 29, 2020 I found out my 2014JK has a fuel guage sender that is virtually identical to the one in my wife's KJ, and very similar to the one in the Dakota fuel pump/sender assembly I use in my MJ. I wonder if the real reason they work better now is that the consistency of the production of the senders and guages is better now due to automated calibration methods. I know when I worked in the electronics industry, we had shifted from manually "trimming" resistor networks that were embedded on ceramic substrates to using lasers to do so, as they were FAR more precise that someone with the industrial equivalent of a Dremel tool and a diamond cutter. Link to comment Share on other sites More sharing options...
derf Posted March 30, 2020 Share Posted March 30, 2020 My 2019 Subaru reads empty when it still has a few gallons left in the tank. I think a lot of manufacturers do that on purpose so that you don't run the car out of gas. They pop up all kinds of warnings on the screen about low fuel to scare you into filling up. Which, given that the fuel in the tank keeps the pump cool, it's not a bad idea to follow that advice. But I don't know how linear the gauge reading is. i.e. is going from 3/4 tank to 1/2 tank the same as going from 1/2 to 1/4 tank? Link to comment Share on other sites More sharing options...
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