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Old 05-02-2000, 04:09 PM
TracStr400 TracStr400 is offline
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Join Date: Feb 2000
Location: Farmingale, Maine
Posts: 48
I have an '87 3/4 ton 4x4 Chevy. 350 TBI. I have factory dual gas tanks. The gauge is always right when I use just the right side tank. When I switch from the right tank to the left tank the fuel gauge will give me a random level. Sometimes it keeps the fuel level of the first tank. Other times it will go way past full and point downwards. And sometimes it will just read half empty or empty. My point is the stupid thing doesn't give an accurate reading after switching from one tank to the other. And I have no idea how much gas I have left (not good). Any help would be greatly appreciated.
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Old 05-03-2000, 06:21 PM
GMC85MAN GMC85MAN is offline
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Join Date: Apr 2000
Location: Lousiana
Posts: 6
I have the same trouble with both of my trucks my 85 GMC and my 82 Chevy(both have saddle tanks). I've heard the same problems from many other people so it must be something with the gauge inside the tank. Yes it is aggrivating. I've run out of gas atleast twice in both trucks.
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Old 05-07-2000, 12:19 AM
yortengel yortengel is offline
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Join Date: Mar 2000
Location: Clawson, Mi
Posts: 216
<p>I used to have the same problems. I replaced the switching valve. And that fixed it. On my truck I also had to replace the fuel gauge. But that was a different problem than you are having. Any way the fuel selector valve also has the fuel sender wiring in it. At least on the 80's vintage itís like that, I am pretty sure its that way also on the FI models. Itís a motor that switches the valve. If it does not travel all the way then it gives you an open condition. (Fuel gauge will read way over full) Mine was just plain broken. You can diagnose this condition by unplugging the six-pin connector and using a jumper wire. Jump the sending unit wires and see how the gauge reads. You will have to get the book and see the colors of the wires. I donít remember what they are. <br>Good Luck.<br>
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Old 05-07-2000, 04:41 PM
TracStr400 TracStr400 is offline
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Location: Farmingale, Maine
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Thanks for the help guys. I'm sure you just saved me some big bucks!
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  #5  
Old 05-17-2000, 10:29 AM
chevy4ever chevy4ever is offline
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Join Date: May 2000
Location: Ft. Worth, Tx.
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You might also check the float. Sometimes they are turned wrong or they can become saturated. Also, before you go buy switching valve, try unplugging the wires and plugging them back in. <p>----------<br>A Cut Above<br>
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