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post #1 of (permalink) Old 10-07-2002, 01:14 PM Thread Starter
 
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Dual Tanks... what\'s broken?

Hi All,

77 K10 with dual tanks. The problem is that sometimes with the left tank, even though there is plenty of gas in the tank, I will "run out of gas"! I have to make sure there is gas in the right tank and then dump a little down the carb and she fires back up. The interior switch is working (i.e., I can flip the switch from one tank to the other and the fuel guage will register both tanks). This is not a constant problem, but it's happened twice already and it sucks. What needs to be replaced? Thanks!
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post #2 of (permalink) Old 10-07-2002, 01:37 PM
 
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Re: Dual Tanks... what\'s broken?

Isn't there a solenoid valve between the tanks that selects which tank feeds the engine? If so, I would check that out, may be an electrical problem or could be a bad valve.

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post #3 of (permalink) Old 10-07-2002, 01:42 PM Thread Starter
 
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Re: Dual Tanks... what\'s broken?

OK, but if that were the case, then wouldn't my gauge be off, too?
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post #4 of (permalink) Old 10-07-2002, 02:09 PM
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Re: Dual Tanks... what\'s broken?

supposedly they are seperate(the gage works seperate from the sylinoid)

Had the problem with mine but the gages wouldnt switch back and forth so I aint got much clue buuuuuuut

Whip out your mulitmeter and check the voltage going into the sylinoid, then change the switch and see if you get voltage on a different wire. If I remember corectly on my 83

there is one constant hot with the ign
light green hot on one tank
dark green hot for the other tank

Hope this helps a bit [img]images/graemlins/smile.gif[/img]

silinoid is on passenger side just ahead of the tank on the frame rail....big harness goes into it
post #5 of (permalink) Old 10-07-2002, 02:56 PM
 
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Re: Dual Tanks... what\'s broken?

Your gauges run off the sending unit in the tanks. A relay switches that and it is independent from the solenoid valve.

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post #6 of (permalink) Old 10-07-2002, 05:46 PM
 
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Re: Dual Tanks... what\'s broken?

I know someone who had the exact same problem, and it was the
actual valve that switches the tanks (or the solenoid that turns
that valve). When you switch gauges, it is just switching
the electrical connections from one sending unit to the other.
The actual tank switch valve is seperate.
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post #7 of (permalink) Old 10-07-2002, 07:13 PM
 
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Re: Dual Tanks... what\'s broken?

Wow Dh, I could have sworn I just said that but maybe it's just on my screen [img]images/graemlins/wink.gif[/img]

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post #8 of (permalink) Old 10-07-2002, 07:29 PM Thread Starter
 
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Re: Dual Tanks... what\'s broken?

I should be able to see the tank valve from the outside? I'm sorry, but I don't even know what I'm looking for [img]images/graemlins/confused.gif[/img]
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post #9 of (permalink) Old 10-07-2002, 07:52 PM
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Re: Dual Tanks... what\'s broken?

$43 for a new solenoid. There's a little piece of rubber in there that wears out. Even with my limited experience, I've never seen a solenoid quit working electrically. It's always been the little piece of rubber that falls apart. I tore my old one apart and they're so simple it amazes me they even work as good as they do.
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post #10 of (permalink) Old 10-07-2002, 08:33 PM
 
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Re: Dual Tanks... what\'s broken?

No, it's underneath I believe, follow the fuel lines from the tanks to it. The lines will go from the tanks, to it, then a line from it to the engine. Should be able to find it quite easily.

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