fuel gauge innaccurate - 1978 Mercruiser 165

T

tony dz

Seaman Apprentice
Joined
Jun 5, 2006
Messages
43
My fuel guage is innaccurate... when the tank is full it reads about 3/4.. best I can tell it's just off by a 1/4 tank, but haven't pushed the low end to find out...

I pulled the sender and manually positined it at the upper limit (metal tab) and it still only read 3/4 full. How do I tell if its a bad sender, bad guage, or bad wire?

I know I saw a thread on this before, but i've been searching for over an hour now and can't find it..
 
Gary H NC

Gary H NC

Fleet Admiral
Joined
Dec 1, 2005
Messages
8,972
Re: fuel gauge innaccurate - 1978 Mercruiser 165

First of all clean all your connections with sandpaper,at the sender and the guage. The ground must be clean as well.
I would bet the sender would be the problem..if all the connections are good.
 
Reel Poor

Reel Poor

Vice Admiral
Joined
Jan 29, 2005
Messages
5,522
Re: fuel gauge innaccurate - 1978 Mercruiser 165

Disconnect the wire from the sender and touch it to a good ground (key on engine off). If the guage now reads full, the sender is the problem.
 
Blk-n-Blu

Blk-n-Blu

Master Chief Petty Officer
Joined
May 12, 2004
Messages
821
Re: fuel gauge innaccurate - 1978 Mercruiser 165

You can probably get a new sender through NAPA auto parts. You will need the tank dimensions, or take it with you.8)
 
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