Fuel gauge problems
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
I don't think there was a 98 PSD. My factory repair manual doesn't list a PSD for 98. Hmmmm?? I know that 97 & 98 were the cross over years between the OBS and NBS trucks. The NBS was only available in the F150 for 97, not sure about 98 though. Someone here will know for sure.
The 99 has an electric Fuel pump, the sender is rated at 15 ohms empty and 160 ohms full. The 97 sender is the same as yours.
You may have a mixture of apple to oranges, might not work?
The 99 has an electric Fuel pump, the sender is rated at 15 ohms empty and 160 ohms full. The 97 sender is the same as yours.
You may have a mixture of apple to oranges, might not work?
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Posting Guru
Joined: Aug 2003
Posts: 1,038
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You are right Jim. Perhaps its from a 99 then. All I know is it didnt look like the one I had. I just tested the sender right at the tank and im not getting anythng, zero. Which is strange because I tested it when I first swapped the new sender in and it was giving me a reading, 61ohms at the time I think. Although the tank was at about 3/4 during the test so 61 would still be inaccurate. Time for a NEW sender I guess.
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Posting Guru
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Today I let my fuel drop below half a tank. To my surprise the gauge started to work. Looks like it works when the fuel level drops below 50%. I wonder if the float is getting stuck on something.
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Posting Guru
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Heres the latest. I bought myself an analog ohm meter with the suspicion my digital fluke wasnt working properly. Sure enough the analog worked and also showed my sender worked as well. I tested it near empty and was around 35 ohms, and full at 145 ohms. But my dash gauge shows half when the tank is full. As soon as the fuel level actually gets to half the gauge reads correctly until all the way to empty. So im half way there I guess. 
Now my only guess is the gauge is broken. But that would mean I have 2 broken fuel gauges. Perhaps I fried them both while testing wires. Should I buy another gauge?
Now my only guess is the gauge is broken. But that would mean I have 2 broken fuel gauges. Perhaps I fried them both while testing wires. Should I buy another gauge?
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
You could just live with it like that, at least you'll know when it's getting close to empty. I'd guess the sender is your problem. It's for a gasser, right? The odds of 2 bad gages is slim.
Check your email, I sent some additional info.
Check your email, I sent some additional info.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Yep, but it's still the wrong sender.
You can get a new sender from rockauto dot com. $30 IIRC
It sucks but the tank need to come out again IMO.
You can get a new sender from rockauto dot com. $30 IIRC
It sucks but the tank need to come out again IMO.
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Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
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From: Southwest Georgia
You can test your gauge with the new sender before you put it in the tank. Just unplug the old sender and plug in the new sender. Then move the arm all the way up and your gauge should read full, move it all the way down and your gauge should read empty if not, then bad gauge or wiring issues. Just my .02/
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