Fuel gauge always full? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 07-03-2019, 07:57 PM Thread Starter
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Fuel gauge always full?

So, posting for a friend.
He just bought an RV with the 7 tree and all is pretty good. Thing is, the fuel gauge on the dash always reads full. Can y'all point me at a troubleshooting guide? We take some serious road trips and I would like to have a better gauge than the trip I meter. TIA
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post #2 of 5 Old 07-09-2019, 03:40 AM Thread Starter
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Bump. Any advice is appreciated. Hopefully someone else has experienced this.
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post #3 of 5 Old 07-09-2019, 09:55 AM
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What is the RV using for a gauge, factory Ford or some other chassis' gauge? For a factory Ford gauge (94-97 anyway) the fuel gauge should read empty at 22.5 ohms and full at 145 ohms. You could always disconnect the fuel sender wiring and jump it with a appropriate sized resistor. See if any of the sender wires are open circuited (from gauge to sender). Cheers!
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post #4 of 5 Old 07-09-2019, 10:16 AM
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Check the related fuses

check the grounds near/around fuel tank (bad grounds are famous on these older trucks and RV's sit a lot and usually arnt washed so any salt/de ice fluid may have rusted some stuff in the under carriage, check the wire pins/wire harness for wear marks, rubbed spots, and the fuel sender sensor. Also I can't remember the details but some tanks has a float but don't remember if the 7.3l did etc. if its stuck or corroded from bad fuel or sitting close to E for long periods.
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post #5 of 5 Old 07-09-2019, 04:10 PM Thread Starter
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Yeah, first thing we did was check all the fuses. I believe it is a Ford chassis. The front end is 100% identical to his 7.3 cargo van. Good to know the resistance readings. That will be a quick test to see in which direction the problem lies. Justin has me thinking. I will have to check, but I think he said one of the tanks was replaced before he got it. Can't recall if it was black, gray or fresh but that could be an area to look for wire damage.
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