Fuel sending unit problem
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Fuel sending unit problem
I've been searching the site and other places and I haven't come up with an answer to whats going on with the new fuel sending unit I put in the rear tank of my '89 F250 - No matter how much fuel I put in the tank it always reads half a tank, be the tank empty or full. This has caused a few situations where I've run out of gas.
I bet the sender I purchased is bad, but I was just wondering if there was any other possibilities for the constant half-tank reading. Anyone have any ideas?
I bet the sender I purchased is bad, but I was just wondering if there was any other possibilities for the constant half-tank reading. Anyone have any ideas?
More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
Way past fuul means too much resistance probably the thin metal on the plastic board wore off where the little metal finger sweeps in the sending unit. Much like an old slot car track with the trigger speed control. Does the fron tank read ? Mine stayed in one spot and it ended up being the gauge cluster.
Tuned
Joined: Aug 2013
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Way past fuul means too much resistance probably the thin metal on the plastic board wore off where the little metal finger sweeps in the sending unit. Much like an old slot car track with the trigger speed control. Does the fron tank read ? Mine stayed in one spot and it ended up being the gauge cluster.
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Joined: Nov 2012
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From: New Sharon, IA
Way past fuul means too much resistance probably the thin metal on the plastic board wore off where the little metal finger sweeps in the sending unit. Much like an old slot car track with the trigger speed control. Does the fron tank read ? Mine stayed in one spot and it ended up being the gauge cluster.
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More Turbo
Joined: Jan 2010
Posts: 685
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From: Western NC mountains
I would start at the selector valve plug and go back then. Resistance shouldnt be more than like 120ohms or so i think. Cant remember exactly what they are without having my fuel.sending unit book from parts store in front of me. I would bet that unit is bad. You should be able to swith to that tank unplug it and ground it and see if gauge goes both directions. Be sure to switch to that tank so your not chasing your tail. Dont ask why i would say that. Lol
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Joined: Nov 2012
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From: New Sharon, IA
I dropped my tank yesterday and my sending unit switch had fallen off of inside the tank and the yellow wire was broke off too! So i readjusted the copper tang so it made better connection then i re soldered the wire on an put it all back together and walla!! It works!!!
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Sorry, I had no internet access over the weekend. Anyway, yes I have two tanks, the gague works fine for the front tank, but I replaced the rear fuel pump and the old sender went bad (always red full) so I put in a new sender and now I have this constant half-tank reading nonsense that Ive not run into in 15 years of turning wrenches.
Like I said I figure the sender is bad, its just chosen a new and improved way of being bad - I guess thats what you get from part store junk...I'd just always had good luck with Spectra Premium parts.
Like I said I figure the sender is bad, its just chosen a new and improved way of being bad - I guess thats what you get from part store junk...I'd just always had good luck with Spectra Premium parts.
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