1989 MP- Propane level always shows full

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1989 MP- Propane level always shows full

August 06, 2017, 08:29:05 pm

My "information center" showing battery charge and tank levels has worked great, until the last propane fillup. Since then, it has always read full. At first I chalked it up to summer use- that it really was still full, but it took 8 gallons today, so I know it was pretty close to empty.

So far, I've confirmed that the wires going to the propane tank are connected. They are. I can continuity test the wires to make sure they aren't broken from the info center to the tank, but have no idea what else to try. Anyone know?

Re: 1989 MP- Propane level always shows full

Reply #1 – August 06, 2017, 10:40:14 pm

The propane level potentiometer is typically magnetically coupled to the float inside the tank. Take part pick up magnet see if you can move the tank dial around.

Re: 1989 MP- Propane level always shows full

Reply #2 – August 07, 2017, 10:58:35 am

Haven't specifically looked at the LPG level indicator, but the tank senders all have a local ground connection. You should probably include that in your checks, as it's usually the first connection to fail under the vehicle.

Chip

Re: 1989 MP- Propane level always shows full

Reply #3 – August 07, 2017, 04:54:50 pm

Just so we're clear on what we're talking about, is this a removable vertical (DOT) tank, or a permanently mounted horizontal (ASME) tank? I don't know when LD switched, but my 1985 had a DOT tank with a nonworking sender of some kind.

Re: 1989 MP- Propane level always shows full

Reply #4 – August 07, 2017, 09:37:40 pm

Permanent horizontal tank. 2 wites, red and black, going to the tank, both appear solidly connected

Re: 1989 MP- Propane level always shows full

Reply #5 – August 08, 2017, 07:36:27 am

Here are a couple ideas, like Rodney said above it could be a stuck indicator or bad gauge.
Propane Tank Gauge Sticking? - Propane Tank Store
LP tank level indicator/sensor problem

Re: 1989 MP- Propane level always shows full

Reply #6 – August 08, 2017, 10:17:45 pm

Thanks. I don't have a gauge mounted on the tank, but the sender should operate off the same principle correct?

Re: 1989 MP- Propane level always shows full

Reply #7 – August 09, 2017, 11:29:23 am

Jeff,
Please post a picture of the gauge. My 1988 Mid Bath has an ASME horizontal tank and a permanently(screws) mounted gauge . My Class B has a 2004 tank with magnetically coupled snap on plastic indicator.

Re: 1989 MP- Propane level always shows full

Reply #8 – August 09, 2017, 12:00:30 pm

With the wires removed front tank's sensor, what resistance do you measure?

Larry

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