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Fuel Gauge not synching

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Topic author Canada
Passin'Gas
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Fuel Gauge not synching

Postby Passin'Gas » October 3rd, 2016, 8:57 am

I have a Riviera with dual fuel tanks and a single gauge. There is a toggle switch that switches the gauge from the left and right tanks. My problem is that one side shows on the gauge but when toggled to the other the gauge needle goes below the gauge and does not register.

What do I need to do to synch the gauge to both tanks? I believe it's the sending unit. Does anyone know what type of unit I need?

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Re: Fuel Gauge not synching

Postby g36 » October 3rd, 2016, 10:33 am

The problem could be with switch or at tank. HAve you checked the connectors at the sending unit on top of the tank for corrosion or if loose if so here's a link to check to save me typing it
http://www.boatingmag.com/checking-boat ... ding-units
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Topic author Canada
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Re: Fuel Gauge not synching

Postby Passin'Gas » October 3rd, 2016, 12:49 pm

Thanks. Great article! I'll do some checking this weekend....
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Re: Fuel Gauge not synching

Postby hausherrs » October 3rd, 2016, 2:50 pm

I have these problems as well. I filled up Saturday because the gauges said I had 1/4 tank in each. But I was only able to get 40 in each (100 gallon tanks). And when I was filling up the stb tank I was about 1/8 from the full mark and fuel came out the breather. When I am holding down the toggle to check the levels the needle jumps around on its way up and will eventually settle where it thinks the fuel level is. Obviously wrong. Ill be down in the er today after work and I will check connections. But im betting that my senders are bad. They do both behave the same though, so maybe its the switch.

Steven
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Re: Fuel Gauge not synching

Postby mjk1040 » October 3rd, 2016, 6:59 pm

I'd lean toward the sending unit, but hey u never know with electronics. Mike
PS-Check the ground!
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Re: Fuel Gauge not synching

Postby RGrew176 » October 3rd, 2016, 10:49 pm

Could be a few things. I have the same set up. A switch that I mover from left to right to check the fuel levels in each tank. Earlier this season I lost the starboard tank. I moved the switch to the starboard tank and I got no reading. After reading other posts here and in other forums I pulled the starboard aft cabin bed so I could get to the tank. I checked the connections and they were tight. I then disconnected the wires and cleaned them and the connection on the tank. I also pulled and cleaned the ground. After reconnecting the wires the switch worked once again.

It could be something as simple as the connection, but it could also be the sending unit. Hope you figure it out.
Rick Grew

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Topic author Canada
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Re: Fuel Gauge not synching

Postby Passin'Gas » October 3rd, 2016, 11:45 pm

Thanks guys. I think the obvious place to start is with the connections, wiring and ground. Let's hope it's that simple. Failing that, I'll check or replace the sending unit. If it's at all corroded it's likely not a bad idea to spend the $100 and get a new one (or two).

I'll keep the updates going....
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Re: Fuel Gauge not synching

Postby hausherrs » October 4th, 2016, 8:45 am

Mine turned out to be the upper helm switch (Possibly the upper guages, I have not replaced anything yet). I have a lower also and I tried the switch there and I have one tank full and one tank 3/4, which explains the list. Replacing the switch today.
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Re: Fuel Gauge not synching

Postby mjk1040 » October 4th, 2016, 12:03 pm

Hope that fixes it. Can you exchange the switches from the lower helm to the upper to be sure its the switch?
Mike :down:
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
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hausherrs
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Re: Fuel Gauge not synching

Postby hausherrs » October 4th, 2016, 12:15 pm

mjk1040 wrote:Source of the post Hope that fixes it. Can you exchange the switches from the lower helm to the upper to be sure its the switch?


Ther appear to be the same switch. Ill give it a shot.

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