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Old 03-29-2005, 11:35 AM
TonyB's Avatar
TonyB TonyB is offline
TT Enthusiast
Join Date: Mar 2005
Boat: 1991 Prostar 190 Powerslot
Location: Somerville AL
Posts: 404
Fuel Gauge Problem!

I have a fuel gauge that functions intermittently. My Mastercraft is 91 Prostar with a mechanical sending unit that has been replaced twice.

Most of the time the gauge will show empty. Other times it will seem to operate correctly for a while until it is around the 1/2 to 3/4 mark. Then the needle will stay at the 1/2 full mark until is trailered home.

Sometime between then and the next time out it will reset to empty.

I've read through the old archives and have never seen anyone describe the intermittent nature that I have described.

I have removed the gauge and checked its operation independently and it seems to work fine.

I am sort of thinking it may be a grounding issue.

Thanks for helping the new guy.

Last edited by TonyB; 03-29-2005 at 11:37 AM.
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Old 03-29-2005, 12:24 PM
east tx skier's Avatar
east tx skier east tx skier is offline
MC Hero
Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
Posts: 26,185
Welcome, TonyB. While most people tend to have issues with their fuel sending units, it looks as if you've already addressed that issue. I'm sure someone will offer some good adivce soon. Until then, glad to have you here.
Previous: 1993 Prostar 205

Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.


Be kind. Have fun.
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Old 03-29-2005, 12:55 PM
AR Footer's Avatar
AR Footer AR Footer is offline
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Join Date: Jul 2004
Boat: 1985 MasterCraft S & S 351 w/powerslot
Location: South
Posts: 152
I had a similar problem on my 85 and I had two different issues. One was that the sending unit was bad. I took it out and made sure that I had a good ground and tested it and then replaced it with a new one. When I put the new one in, I thought that I had everything grounded and hooked up properly but sometime after I tested it I must have went back and tightened the ground wire and caused it to lose contact. When I went back and did my trouble shooting I found the bad ground, fixed it and now everything works correctly.
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Old 03-29-2005, 01:04 PM
jsonova99's Avatar
jsonova99 jsonova99 is offline
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Join Date: Dec 2004
Boat: 1991 Mastercraft Prostar 190
Location: Eastern Shore of Virginia
Posts: 1,055
I have a '91, and mine would stick at 3/4 of tank. I sucked up it up and bought one of the new style sending units. I think it was $105 through Rambo Marine. I think it's well worth the money. I played with my old one trying to get it to work without success. I got stranded one time running out of gas, and that was it, ordered the new one the next day and it works perfectly.
1991 Prostar 190 - Ambush 4 blade prop
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