1970MonteMotion Posted January 16, 2012 Share Posted January 16, 2012 I have a 1970 MC, factory 350/300HP, and T350 also from factory. I filled my car up and the needle went well past full. I drove it for a few days, and the needle never moved again. So now, I never know how much gas is in it and thats dangerous on these long country roads. Leads to pitch black, cold, long humps, lol. I figured it's the sending unit on the tank, but I'm just guessing. I called to order one, but I need to know if anyone with a similar model could tell me which sending unit I need? WITH RETURN, OR WITHOUT RETURN??? W/O IS CHEAPER, BUT I'M NOT SURE WHICH I HAVE. Also, should I look for something else first? Maybe the wires or a pick up? Anyone have experience with the gas needle doing this? Would appreciate all help. Thanks in advance Quote Link to comment Share on other sites More sharing options...
Mikstudie Posted January 16, 2012 Share Posted January 16, 2012 If you have a bad ground it will peg the needle.Theres a wire where the sending unit goes in the tank that breaks often. Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 17, 2012 Author Share Posted January 17, 2012 Do you think this model has a return on sending unit or no return? Quote Link to comment Share on other sites More sharing options...
montefrazer Posted January 17, 2012 Share Posted January 17, 2012 Way past full is usually the power wire. It's the brown one going through the trunk floor, by the back bumper, to the sending unit. Since you have a 70, just crawl under the car and see how many lines connect to the sending unit at the front of the tank. One, no return. Two, return. Unless yours has the California emissions set up. Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 17, 2012 Author Share Posted January 17, 2012 Thank you all Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 17, 2012 Author Share Posted January 17, 2012 Way past full is usually the power wire. It's the brown one going through the trunk floor, by the back bumper, to the sending unit. Since you have a 70, just crawl under the car and see how many lines connect to the sending unit at the front of the tank. One, no return. Two, return. Unless yours has the California emissions set up. Does it need a new wire all together maybe? Bad ground? Common place to find ground? Trunk I suppose? Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted January 17, 2012 Share Posted January 17, 2012 Check your wires the power wire in in the trunk drivers side its brown and goes down through the rear of the trunk to the sending unit. The ground attaches to the front of the trunk pan. Check for corrosion on both. I got my sending unit from OPG was nice quility but just make sure they have it in stock before you order it. Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 17, 2012 Author Share Posted January 17, 2012 ^^^Thank you^^^ Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 17, 2012 Author Share Posted January 17, 2012 Is it fairly easy to drop the tank and screw in the new unit? As long the tank is near empty? Quote Link to comment Share on other sites More sharing options...
Mikstudie Posted January 18, 2012 Share Posted January 18, 2012 Is it fairly easy to drop the tank and screw in the new unit? As long the tank is near empty? Yes,as long as the strap bolts are not rusted too bad. Quote Link to comment Share on other sites More sharing options...
1970MonteMotion Posted January 19, 2012 Author Share Posted January 19, 2012 Thanks. My dad and I dropped the tank, hooked up the new unit and slapped it back together. I now TRUELY know how much fuel I have! lol. Thanks to everyone. Quote Link to comment Share on other sites More sharing options...
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