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Fuel issues My sister has an 1989 volvo 240 GL w/ a 4cyl b330. she was on her way from arizona to Kansas City, when she started losing power. the way that she described it to me is that the temp would go higher than normal(healthy?) and the RPM would steadily decline, until it got to about 600 RPM, then it would die. she was getting 2 codes, 231 and 121? but she couldn't remember the last one. they said too much or to little fuel at cruise speed, and fuel injectors respectively. also, the fuel relay on the fuel tank was replaced resently.
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Your sending unit in the tank is bad and needs to be replaced. There is a short in it. That is the only thing that can go wrong with it. There is probley a broken wire on it so it wont read right.
There is a fuse up by the Battery alone in a white receptacle with red wires. It may not be blown but is corroded. Thoroughly clean it. This feeds the Fuel pump circuit.If tat is good the white fuel pump relay under the glove box may be bad.
could be a bad filter or failing pump.
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