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tow bar
by G Walker - 24/08/26 06:52 PM
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Forums39
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Jun 14th, 2026
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Joined: Oct 2020
Posts: 121 Likes: 1
L - Learner Plates On
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L - Learner Plates On
Joined: Oct 2020
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I use the gps unit for the speed. This gas gauge is an odd duck. It says I was pretty low the other day and all it would take was 4 gallons. do they have an idiot built in reserve so when it is at 0% you still have a couple of gallons? I also noticed on the tach that the gas gauge is there and there is a 0/0 that is on the left of the digital screen. What is that? I haven't found anything in the owners manual or maybe I have and did not know it. I need to just use the odometer as my gas gauge like I do on my BMW motorcycle. Their gas gauge is a joke as well. I ran out of gas and the gauge was showing a little less than half a tank.
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Joined: Aug 2019
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Learner Plates Off!
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Learner Plates Off!
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The 0/0 is a really cheesy per-cent sign. There is a discussion about how to (slightly) improve the fuel gauge by changing to a 280mm sender with a correcting shunt resistor in this lengthy thread.
2020 M3W
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Joined: Feb 2019
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Talk Morgan Addict
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Talk Morgan Addict
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Last edited by LightSpeed; 05/11/20 11:01 PM.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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Joined: Oct 2020
Posts: 121 Likes: 1
L - Learner Plates On
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L - Learner Plates On
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The 0/0 is a really cheesy per-cent sign. There is a discussion about how to (slightly) improve the fuel gauge by changing to a 280mm sender with a correcting shunt resistor in this lengthy thread. Are you SERIOUS??? 0/0 is a percentage sign??? Well thank you for solving that mystery. I am not going to go to great lengths worrying about the gauge. I will start by finding a comfortable mileage and use the tripometer as my gauge. Done it for so long on other things that it is no big deal.
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Joined: Feb 2018
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Talk Morgan Regular
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Talk Morgan Regular
Joined: Feb 2018
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These are indeed quirky machines. The fuel gauge is pretty much useless. Mine sometimes give me a reading that seems close to actual, but mostly reads 0. I've had it out to clean and inspect the float wires (inside the alloy tube) a few times now. Sort of works for a tank full, maybe two, then back to 0.
My personal strategy is to fill up until I get an auto click off (one time) then reset the trip odometer. I start looking for gas when I get to 180-200 miles on the trip meter. Never had an issue with that.
Some have reported issues (check engine light and rough running for a short while) when they try to fill the tanks 'up to the brim'.
Steve
Late 2012 M3W
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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My speedo is not a constant 5mph high its near 10% through the range so indicated 30mph is really 28mph & indicated 70 is actually 65. All speedos legally cannot under read but can be upto 10% optimistic.
Last edited by TimG; 06/11/20 09:10 AM.
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Member of the Inner Circle
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Member of the Inner Circle
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My Roadster under reads by 10% but MMC says it is legal. Another feature! I fitted a GPS speedo off fleabay as belt and braces
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Black Rat Charter Member
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Black Rat Charter Member
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My Roadster under reads by 10% but MMC says it is legal. Another feature! I fitted a GPS speedo off fleabay as belt and braces MMC is wrong, all manufacturers are required to fit speedometers that do not under read that is why most over read by 10% it is to protect your licence. It is possible to re-calibrate your electronic speedo using the reset button I think there was a post on here once.
Keith
2013 narrow bodied + 4 Ruby.
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L - Learner Plates On
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I used a cheap door bell button and a couple of pieces of wire to recalibrate my speedometer. The instructions to do so are in an article in the Morgan Club newsletter and are linked to in the first post on this thread.. I played around with mine and got the speed shown to match up with the GPS speedo on my phone.
John
Last edited by linklaw; 06/11/20 12:17 PM.
John Linkosky
1995 4/4
2005 Roadster
2016 3W Superdry Edition
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Talk Morgan Addict
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Now that you have your doorbell button you need to find the magic wire.
I gave up and just use the gps.
2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)
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