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Author Topic:   Electrical Fuel Gauge Inacurrate
Captain Jacob Reaves posted 01-31-2007 01:32 PM ET (US)   Profile for Captain Jacob Reaves   Send Email to Captain Jacob Reaves  
I moved this from the Repairs board..

Hello--I have a 2006 Guardian 22 with a Whaler Fuel Gauge on the Dash. It seems to be stuck on half full. When I turn the key off and the gauge has no power to it it reads empty, which it should. When I turn the key on it goes to half full.
[What is causing this?] Any help will be greatly appreciated.


Captain Jacob Reaves posted 01-31-2007 01:34 PM ET (US)     Profile for Captain Jacob Reaves  Send Email to Captain Jacob Reaves     
How would I check if the sending unit is working properly??

When I put fuel in the boat the Gauge does not move.

Captain contender posted 01-31-2007 10:00 PM ET (US)     Profile for Captain contender  Send Email to Captain contender     
could be either the gauge, or the sender, I would try the sender first, Spoke about this before electric fuel gauges are never right, they either move to fast or to slow and do not show the correct amount of fuel. A lot of people in south fla go to a fuel meter that measures how much gas goes through the line to the engine. Personally I removed my sending unit and replaced it with a mannuel gauage and placed a clear cover over the sending unit so I just look down at my tank gauge to see the amount of fuel...good luck
Captain Jacob Reaves posted 02-01-2007 12:23 AM ET (US)     Profile for Captain Jacob Reaves  Send Email to Captain Jacob Reaves     
contender- I would rather have a gauge on the floor, on the top of the tank, like the older Whaler's but mine came with the other style...
Captain Binkie posted 02-02-2007 07:09 PM ET (US)     Profile for Captain Binkie  Send Email to Captain Binkie     
I have the same problem as the Captain has on one of my tanks. What is a manual gauge. Got any idea how I could remove the sending unit and rig up a dip stick, (that's the most accurate) Its a built in plastic tank.


Captain where2 posted 02-02-2007 09:51 PM ET (US)     Profile for Captain where2  Send Email to Captain where2     
The "manual gauge" mounts in the same location as the electrical gauge sender on the tank (direct replacement). Instead of having an electrical connection to the dash gauge, it has a magnet mounted inside the sender which points the needle on the exterior visible gauge. You can get one that has a manual sight and the electrical hookup for the dash mounted gauge.

As a result of the magnet setup, it is possible to break the sight glass off the visible gauge without fear of gasoline fumes escaping from the tank into your bilge.

Now, if you want the dash mounted gauge to read correctly, you can purchase any number of higher technology sending devices. I have seen ones that use doppler technology to measure the distance between the sender and the surface of the fluid below. I have seen ones that use a float containing a magnet and have a series of reed switches mounted vertically which close one at a time to provide different resistance readings. Or, there's the old standard which uses a variable resistor mounted to an arm with a float. When a little corrosion grows on the variable resistor, it tends to have spots that do not read correctly.

Deckhand Binkie posted 02-03-2007 06:03 PM ET (US)     Profile for Deckhand Binkie  Send Email to Deckhand Binkie     
We all can`t be Captains, somebody`s got to be deckhand.
QMED jimh posted 02-03-2007 06:13 PM ET (US)     Profile for QMED jimh  Send Email to QMED jimh     
Or a Qualified Member of the Engineering Editing Department.
Binkie posted 02-04-2007 07:27 AM ET (US)     Profile for Binkie  Send Email to Binkie     
Hey Jim, cool, I didn`t think you had a sense of humor. Actually, when I was in the Coast Guard, I always felt more comfortable, in the engine room as a bilge rat. No way would I want to be up on deck chipping paint, working with the deck apes.

LOL, whats this discussion doing in the electrcal area, nobody hardly comes here.


contender posted 02-07-2007 08:27 PM ET (US)     Profile for contender  Send Email to contender     
Binkie, what kind of plastic tank do you have, is there a electric sending unit on the tank now?
Binkie posted 02-07-2007 08:34 PM ET (US)     Profile for Binkie  Send Email to Binkie     
yes, there is an electric sending unit on the tank. It worked for a couple of weeks, and then quit. although the needle blips when I turn on the ignition. I`ve been over and over the connections, but can`t find anything loose.


swist posted 02-08-2007 09:33 AM ET (US)     Profile for swist  Send Email to swist     
Samll boat fuel gauge senders are crap. And to make it worse, you can't even buy one that isn't.
contender posted 02-08-2007 09:19 PM ET (US)     Profile for contender  Send Email to contender     
Binkie, I know this sounds stupid but one of your wires maybe bad, can you move the wires while someone watches the gauge, also what type of tank is it, I will be at the miami beach boat show coming up can look for mech. gauge to replace the sender. need to know the hole pattern/size?

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