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Old 06-01-2005, 04:23 PM
torbmi torbmi is offline
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Fuel gauge pegged to full

'89 Tristar 190. Ran great this past weekend, but unless I'm getting the best mileage of all time, my fuel gauge is pegged to full and won't budge. When I turn the ignition off, it goes to empty, but as soon as I turn the key it stays on full. I had the sending unit in the tank replaced at the end of last season, and the gauge worked fine during the first couple of outings this year.

Any thoughts? Thanks.
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Old 06-02-2005, 05:14 PM
Hunterb Hunterb is offline
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Boat: 1990 Prostar 190 351
Location: Southwest Canada
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I think you need to look at your wiring. Usually a pegged guage means a short between the power supply (pink wire I think) and the ground. Make sure everything is connected properly. If it is then I would look at the sending unit to see if something is stuck and not allowing the float to lower down out of the full position.

Just a couple thoughts. I just replaced my sending unit because my guage red empty all the time. New sending unit and I'm good to go.

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Old 06-04-2005, 10:02 PM
stevo137 stevo137 is offline
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My fuel gauge is not working properly either.
It jumped around for awhile, now it just shows about an 1/8 of a tank even after I filled it with 15 gallons.
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Old 06-04-2005, 10:20 PM
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Laurel_Lake_Skier Laurel_Lake_Skier is offline
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Boat: 1996 FlightCraft
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Both of these problems sound like the float in the sender is stuck in the tube or magnets have come loose. There are quite a few posts somewhere here on disassembling the sender, sanding the float/ regluing the magnets. Do a search for the topic. I did this diy fix last summer and it took care of the problem. I suppose at some point I'll be looking at getting a new sender but after the fix, everything seems be working as it should.
1996 FlightCraft Barefooter—Merc 200 EFI
1991 ProStar 190—Acme 475, GT40-P heads, Edelbrock Performer intake, Mallory YLM Ignition
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Old 06-06-2005, 11:21 PM
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I tried doing the Fix about glueing the Magnets on, but i only had 1 Magnet and my replacement Mag must not be strong enough. Has anyone tried the cheaper fuel sending untis ? Does anyone know these won't work ? The replacement for the Tube one is $100+ I can grab the cheaper replacements for $20 bucks !!
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Old 06-07-2005, 12:47 AM
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More fuel gauge problems? Boats and Jeremy's truck!
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Old 06-21-2005, 09:48 PM
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teddy teddy is offline
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Boat: 1993 ProStar 190 25th Anniversary Limited Edition LT1 Power Slot
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My 90 Pro Star had a similar problem. I hadn't tightened the screws holding the guage into the tank enough and the guage stuck on the top of the tank. It would read out of the tank so I knew it wasn't the sending unit. It could be lots of things but this fix was quick cheap and effective.

Good Luck
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Old 06-21-2005, 10:25 PM
Hunterb Hunterb is offline
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I replace mine with one of the $20.00 teleflex sending units. It seems to work fine. I just did it recently so I can't comment on the longevity.

Good luck

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Old 06-22-2005, 12:18 AM
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lakes Rick lakes Rick is offline
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I replaced mine with the expensive one and after I dialed it in correctly my gauge works great....
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Old 06-22-2005, 12:35 AM
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erkoehler erkoehler is offline
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Here is a weird problem for you:

When I turn on my navigational lights, my fuel gauge pegs itself all the way to full and my tach stays at the last RPM before turning on the lights!
Any other time, the fuel gauge functions normally w/ lights off.
Anybody have a solution for that one?
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