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Car Forum / Mercedes-Benz Cars / July 2007fuel pump wire
1984 500 SEL euro .Car quit the other day (ran out of gas, and my fuel gauge doesnt work). I didnt think it was gas though, because I just changed the fuel filter, so I figured maybe something came loose. Nothing was, but a wire going towards the fuel pump (positive i think) was hot. I mean so hot it burned me when I touched it, but the other one wasnt hot. Is that normal? It was REALLY hot Sounds like fuel pump is toast. Draw too much current and thus makes the wire hot... this also means the fuel pump relay is toast also... as the relay is stuck on... which is why you felt the hot wire when engine is off... which should have turned off the power to the fuel pump also. The fuel pump works fine though. The car ended up being out of gas and runs fine. > The fuel pump works fine though. The car ended up being out of gas and > runs fine. Perhaps a clogged fuel filter. It swallowed the dirt from the empty tank bottom. That's one of the reasons not to let run dry an old car.  SignatureRoland Franzius If only one wire was hot, remove it and clean it and the post it came off of. Heat at one spot usually means a poor connection. Paul >> The fuel pump works fine though. The car ended up being out of gas and >> runs fine. > > Perhaps a clogged fuel filter. It swallowed the dirt from the empty tank > bottom. That's one of the reasons not to let run dry an old car. > If only one wire was hot, remove it and clean it and the post it came off > of. Heat at one spot usually means a poor connection. Thats of course right but in case of fuel pump I dont know if the case has ground connection even without the ground wire. Then only the plus wire is getting hot with overload. Should be easly found out measuring the voltages at the bolt and the + wire . SignatureRoland Franzius |
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