Speedhut Fuel Gauge Calibration - JeepForum.com
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post #1 of 8 Old 01-22-2020, 09:30 AM Thread Starter
cbauer210
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Speedhut Fuel Gauge Calibration

Hey there...Sorry if this is a dumb question. I recently installed the CJ7 gauges from Speedhut (which are awesome by the way) but I'm having trouble calibrating the fuel gauge. I'm wondering if there may be a trick I'm missing. The gauge works fine but when I fill the tank it only goes to the 3/4 full mark and then the empty light comes on after about 130 miles of driving. Right now I have the gauge set for 73 ohms when empty and 8-12 when full which should be correct for my 81 CJ7 but clearly that isn't right. The PO did mention that he had changed out the fuel sender so I'm assuming he used one that was not the same as stock.

The only other option Speedhut gives you outside of their presets for setting up the gauge is setting an empty and full point. I'd love to do that, but I can't really figure out a way to drain my tank and store 15 gallons of fuel while I set the empty point.

Any ideas where I should go from here or do I just need to grab some 5 gallon buckets and do this the hard way?


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post #2 of 8 Old 01-22-2020, 10:07 AM
cjoffroad
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Have you tried the other presets yet? You could try the other presets that are built in if you think the PO swapped in a different fuel sender. See if it works. Other than that I think you'll need to grab some buckets as you've suggested
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post #3 of 8 Old 01-22-2020, 10:42 AM
caseypotts
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Any and all of my fuel gauge issues from Speedhut came down to a poor ground connection at the sender. Once I solved that issue I was good to go.

I'm not sure why you would need a bunch of buckets, if you choose to go the route of custom fuel level. Just drive with a 1 gallon gas can until you run out of fuel, set your empty, put in a little fuel and drive to the gas station, fill up and set your full. BUT...setting up your gauge like this would not be my first choice.

If not a ground issue, my second thought is this sounds like more of a sender issue with ohms readings. The only way that I know of to check that is to remove the sender and put it on meter where you can verify that it is reading correctly throughout the swing.

Other than this, have you contacted Speedhut? They have over average customer service. They will probably give you similar advice...because it is the advice that they give me.

They are indeed awesome gauges!
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post #4 of 8 Old 01-22-2020, 11:21 AM Thread Starter
cbauer210
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Quote:
Originally Posted by caseypotts View Post
I'm not sure why you would need a bunch of buckets, if you choose to go the route of custom fuel level. Just drive with a 1 gallon gas can until you run out of fuel, set your empty, put in a little fuel and drive to the gas station, fill up and set your full. BUT...setting up your gauge like this would not be my first choice.
Ahh...I wasn't sure if you could set the empty and full at different times, but thats a good idea. I'll look into it and the grounds.

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post #5 of 8 Old 01-22-2020, 02:17 PM
dirtdudeaz
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Why not pop your sender out and hook up a multimeter and manually activate the float in its range and see what your max and min values are?

Or if you don't have a multimeter (free sometimes with a harbor freight coupon, or only like 5$), you could keep the sender plugged into your gauge and mess with the presets until you find one that matches the full travel.
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post #6 of 8 Old 01-23-2020, 06:08 AM
BrutusBlue
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I’m curious to hear your resolution. I have had my eye on Speedhut gauges. As for the gas, I run the same fuel in all of our vehicles so when I empty a tank I just top the others off.
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post #7 of 8 Old 01-23-2020, 08:17 PM
cjoffroad
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Speedhut does have great customer service IMHO. Over this past summer I noticed my fuel gauge no longer registered off Empty. Everything else worked fine. I called them and went through some troubleshooting, I ended up dropping the tank and testing the sender as well as custom calibrating the gauge. Finally determined something was wrong with the gauge so they emailed me a prepaid shipping label to send the gauge in for repair. Got it back in about a week. Speedhut determined that the circuit board had fried due to a power surge, so it was something on my end that caused it. My wiring was in pretty bad shape and so I've since replaced it with a painless and hope it doesn't happen again.


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post #8 of 8 Old 01-25-2020, 06:17 PM Thread Starter
cbauer210
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Quote:
Originally Posted by BrutusBlue View Post
I’m curious to hear your resolution. I have had my eye on Speedhut gauges. As for the gas, I run the same fuel in all of our vehicles so when I empty a tank I just top the others off.
I ended up driving it around until the tank went empty. I had a gas can in my trunk but luckily I ended up sputtering into a gas station right as I ran out of gas. There I was able to set the empty and full points and everything seems to be working well.

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